PPPD
NAME SYNOPSIS DESCRIPTION FREQUENTLY USED OPTIONS OPTIONS OPTIONS FILES SECURITY AUTHENTICATION ROUTING MULTILINK EXAMPLES DIAGNOSTICS EXIT STATUS SCRIPTS FILES SEE ALSO NOTES AUTHORS
pppd - Point to Point Protocol daemon
pppd [ ''tty_name''? [ ''speed''? ''options''?
The Point-to-Point Protocol (PPP) provides a method for transmitting datagrams over serial point-to-point links. PPP is composed of three parts: a method for encapsulating datagrams over serial links, an extensible Link Control Protocol (LCP), and a family of Network Control Protocols (NCP) for establishing and configuring different network-layer protocols.
The encapsulation scheme is provided by driver code in the kernel. Pppd provides the basic LCP, authentication support, and an NCP for establishing and configuring the Internet Protocol (IP) (called the IP Control Protocol, IPCP).
Communicate over the named device. The string
Set the baud rate to
asyncmap
Set the async character map to asyncmap options are given, the values are ORed together. If no asyncmap option is given, no async character map will be negotiated for the receive direction; the peer should then escape all control characters. To escape transmitted characters, use the escape'' option.
auth
Require the peer to authenticate itself before allowing network packets to be sent or received. This option is the default if the system has a default route. If neither this option nor the noauth option is specified, pppd will only allow the peer to use IP addresses to which the system does not already have a route.
call name
Read options from the file /etc/ppp/peers/name. This file may contain privileged options, such as noauth, even if pppd is not being run by root. The name string may not begin with / or include .. as a pathname component. The format of the options file is described below.
connect script
Use the executable or shell command specified by script to set up the serial line. This script would typically use the chat(8) program to dial the modem and start the remote ppp session. A value for this option from a privileged source cannot be overridden by a non-privileged user.
crtscts
Use hardware flow control (i.e. RTS/CTS) to control the flow of data on the serial port. If neither the crtscts, the nocrtscts, the cdtrcts nor the nocdtrcts option is given, the hardware flow control setting for the serial port is left unchanged. Some serial ports (such as Macintosh serial ports) lack a true RTS output. Such serial ports use this mode to implement unidirectional flow control. The serial port will suspend transmission when requested by the modem (via CTS) but will be unable to request the modem stop sending to the computer. This mode retains the ability to use DTR as a modem control line.
defaultroute
Add a default route to the system routing tables, using the peer as the gateway, when IPCP negotiation is successfully completed. This entry is removed when the PPP connection is broken. This option is privileged if the nodefaultroute option has been specified.
disconnect script
Run the executable or shell command specified by script after pppd has terminated the link. This script could, for example, issue commands to the modem to cause it to hang up if hardware modem control signals were not available. The disconnect script is not run if the modem has already hung up. A value for this option from a privileged source cannot be overridden by a non-privileged user.
escape xx,yy,...
Specifies that certain characters should be escaped on transmission (regardless of whether the peer requests them to be escaped with its async control character map). The characters to be escaped are specified as a list of hex numbers separated by commas. Note that almost any character can be specified for the escape option, unlike the asyncmap option which only allows control characters to be specified. The characters which may not be escaped are those with hex values 0x20 - 0x3f or 0x5e.
file name
Read options from file name (the format is described below). The file must be readable by the user who has invoked pppd.
init script
Run the executable or shell command specified by script to initialize the serial line. This script would typically use the chat(8) program to configure the modem to enable auto answer. A value for this option from a privileged source cannot be overridden by a non-privileged user.
lock
Specifies that pppd should create a UUCP-style lock file for the serial device to ensure exclusive access to the device.
mru n
Set the MRU [Maximum Receive Unit? value to n. Pppd will ask the peer to send packets of no more than n bytes. The minimum MRU value is 128. The default MRU value is 1500. A value of 296 is recommended for slow links (40 bytes for TCP/IP header + 256 bytes of data). (Note that for IPv6 MRU must be at least 1280)
mtu n
Set the MTU [Maximum Transmit Unit? value to n. Unless the peer requests a smaller value via MRU negotiation, pppd will request that the kernel networking code send data packets of no more than n bytes through the PPP network interface. (Note that for IPv6 MTU must be at least 1280)
passive
Enables the
:
Set the local and/or remote interface IP addresses. Either one may be omitted. The IP addresses can be specified with a host name or in decimal dot notation (e.g. 150.234.56.78). The default local address is the (first) IP address of the system (unless the noipdefault option is given). The remote address will be obtained from the peer if not specified in any option. Thus, in simple cases, this option is not required. If a local and/or remote IP address is specified with this option, pppd will not accept a different value from the peer in the IPCP negotiation, unless the ipcp-accept-local and/or ipcp-accept-remote options are given, respectively.
ipv6 ,
Set the local and/or remote 64-bit interface identifier. Either one may be omitted. The identifier must be specified in standard ascii notation of IPv6 addresses (e.g. ::dead:beef). If the ipv6cp-use-ipaddr option is given, the local identifier is the local IPv4 address (see above). On systems which supports a unique persistent id, such as EUI-48 derived from the Ethernet MAC address, ipv6cp-use-persistent option can be used to replace the ipv6 option. Otherwise the identifier is randomized.
active-filter filter-expression
Specifies a packet filter to be applied to data packets to determine which packets are to be regarded as link activity, and therefore reset the idle timer, or cause the link to be brought up in demand-dialling mode. This option is useful in conjunction with the idle option if there are packets being sent or received regularly over the link (for example, routing information packets) which would otherwise prevent the link from ever appearing to be idle. The filter-expression syntax is as described for tcpdump(1), except that qualifiers which are inappropriate for a PPP link, such as ether and arp, are not permitted. Generally the filter expression should be enclosed in single-quotes to prevent whitespace in the expression from being interpreted by the shell.
allow-ip address(es)
Allow peers to use the given IP address or subnet without authenticating themselves. The parameter is parsed as for each element of the list of allowed IP addresses in the secrets files (see the AUTHENTICATION section below).
bsdcomp nr,nt
Request that the peer compress packets that it sends, using the BSD-Compress scheme, with a maximum code size of nr bits, and agree to compress packets sent to the peer with a maximum code size of nt bits. If nt is not specified, it defaults to the value given for nr. Values in the range 9 to 15 may be used for nr and nt; larger values give better compression but consume more kernel memory for compression dictionaries. Alternatively, a value of 0 for nr or nt disables compression in the corresponding direction. Use nobsdcomp or bsdcomp 0 to disable BSD-Compress compression entirely.
cdtrcts
Use a non-standard hardware flow control (i.e. DTR/CTS) to control the flow of data on the serial port. If neither the crtscts, the nocrtscts, the cdtrcts nor the nocdtrcts option is given, the hardware flow control setting for the serial port is left unchanged. Some serial ports (such as Macintosh serial ports) lack a true RTS output. Such serial ports use this mode to implement true bi-directional flow control. The sacrifice is that this flow control mode does not permit using DTR as a modem control line.
chap-interval n
If this option is given, pppd will rechallenge the peer every n seconds.
chap-max-challenge n
Set the maximum number of CHAP challenge transmissions to n (default 10).
chap-restart n
Set the CHAP restart interval (retransmission timeout for challenges) to n seconds (default 3).
connect-delay n
Wait for up n milliseconds after the connect script finishes for a valid PPP packet from the peer. At the end of this time, or when a valid PPP packet is received from the peer, pppd will commence negotiation by sending its first LCP packet. The default value is 1000 (1 second). This wait period only applies if the connect or pty option is used.
debug
Enables connection debugging facilities. If this option is given, pppd will log the contents of all control packets sent or received in a readable form. The packets are logged through syslog with facility daemon and level debug. This information can be directed to a file by setting up /etc/syslog.conf appropriately (see syslog.conf(5)).
default-asyncmap
Disable asyncmap negotiation, forcing all control characters to be escaped for both the transmit and the receive direction.
default-mru
Disable MRU [Maximum Receive Unit? negotiation. With this option, pppd will use the default MRU value of 1500 bytes for both the transmit and receive direction.
deflate nr,nt
Request that the peer compress packets that it sends, using the Deflate scheme, with a maximum window size of 2**nr bytes, and agree to compress packets sent to the peer with a maximum window size of 2**nt bytes. If nt is not specified, it defaults to the value given for nr. Values in the range 9 to 15 may be used for nr and nt; larger values give better compression but consume more kernel memory for compression dictionaries. Alternatively, a value of 0 for nr or nt disables compression in the corresponding direction. Use nodeflate or deflate 0 to disable Deflate compression entirely. (Note: pppd requests Deflate compression in preference to BSD-Compress if the peer can do either.)
demand
Initiate the link only on demand, i.e. when data traffic is present. With this option, the remote IP address must be specified by the user on the command line or in an options file. Pppd will initially configure the interface and enable it for IP traffic without connecting to the peer. When traffic is available, pppd will connect to the peer and perform negotiation, authentication, etc. When this is completed, pppd will commence passing data packets (i.e., IP packets) across the link.
The demand option implies the persist option. If this behaviour is not desired, use the nopersist option after the demand option. The idle and holdoff options are also useful in conjuction with the demand option.
domain d
Append the domain name d to the local host name for authentication purposes. For example, if gethostname() returns the name porsche, but the fully qualified domain name is porsche.Quotron.COM, you could specify domain Quotron.COM. Pppd would then use the name porsche.Quotron.COM for looking up secrets in the secrets file, and as the default name to send to the peer when authenticating itself to the peer. This option is privileged.
dryrun
With the dryrun option, pppd will print out all the option values which have been set and then exit, after parsing the command line and options files and checking the option values, but before initiating the link. The option values are logged at level info, and also printed to standard output unless the device on standard output is the device that pppd would be using to communicate with the peer.
dump
With the dump option, pppd will print out all the option values which have been set. This option is like the dryrun option except that pppd proceeds as normal rather than exiting.
endpoint
Sets the endpoint discriminator sent by the local machine to the peer during multilink negotiation to . The default is to use the MAC address of the first ethernet interface on the system, if any, otherwise the IPv4 address corresponding to the hostname, if any, provided it is not in the multicast or locally-assigned IP address ranges, or the localhost address. The endpoint discriminator can be the string null or of the form type:value, where type is a decimal number or one of the strings local, IP, MAC, magic, or phone. The value is an IP address in dotted-decimal notation for the IP type, or a string of bytes in hexadecimal, separated by periods or colons for the other types. For the MAC type, the value may also be the name of an ethernet or similar network interface. This option is currently only available under Linux.
hide-password
When logging the contents of PAP packets, this option causes pppd to exclude the password string from the log. This is the default.
holdoff n
Specifies how many seconds to wait before re-initiating the link after it terminates. This option only has any effect if the persist or demand option is used. The holdoff period is not applied if the link was terminated because it was idle.
idle n
Specifies that pppd should disconnect if the link is idle for n seconds. The link is idle when no data packets (i.e. IP packets) are being sent or received. Note: it is not advisable to use this option with the persist option without the demand option. If the active-filter option is given, data packets which are rejected by the specified activity filter also count as the link being idle.
ipcp-accept-local
With this option, pppd will accept the peer's idea of our local IP address, even if the local IP address was specified in an option.
ipcp-accept-remote
With this option, pppd will accept the peer's idea of its (remote) IP address, even if the remote IP address was specified in an option.
ipcp-max-configure n
Set the maximum number of IPCP configure-request transmissions to n (default 10).
ipcp-max-failure n
Set the maximum number of IPCP configure-NAKs returned before starting to send configure-Rejects instead to n (default 10).
ipcp-max-terminate n
Set the maximum number of IPCP terminate-request transmissions to n (default 3).
ipcp-restart n
Set the IPCP restart interval (retransmission timeout) to n seconds (default 3).
ipparam string
Provides an extra parameter to the ip-up and ip-down scripts. If this option is given, the string supplied is given as the 6th parameter to those scripts.
ipv6cp-max-configure n
Set the maximum number of IPv6CP configure-request transmissions to n (default 10).
ipv6cp-max-failure n
Set the maximum number of IPv6CP configure-NAKs returned before starting to send configure-Rejects instead to n (default 10).
ipv6cp-max-terminate n
Set the maximum number of IPv6CP terminate-request transmissions to n (default 3).
ipv6cp-restart n
Set the IPv6CP restart interval (retransmission timeout) to n seconds (default 3).
ipx
Enable the IPXCP and IPX protocols. This option is presently only supported under Linux, and only if your kernel has been configured to include IPX support.
ipx-network n
Set the IPX network number in the IPXCP configure request frame to n, a hexadecimal number (without a leading 0x). There is no valid default. If this option is not specified, the network number is obtained from the peer. If the peer does not have the network number, the IPX protocol will not be started.
ipx-node n:m
Set the IPX node numbers. The two node numbers are separated from each other with a colon character. The first number n is the local node number. The second number m is the peer's node number. Each node number is a hexadecimal number, at most 10 digits long. The node numbers on the ipx-network must be unique. There is no valid default. If this option is not specified then the node numbers are obtained from the peer.
ipx-router-name
Set the name of the router. This is a string and is sent to the peer as information data.
ipx-routing n
Set the routing protocol to be received by this option. More than one instance of ipx-routing may be specified. The 'none' option (0) may be specified as the only instance of ipx-routing. The values may be 0 for NONE, 2 for RIP/SAP, and 4 for NLSP.
ipxcp-accept-local
Accept the peer's NAK for the node number specified in the ipx-node option. If a node number was specified, and non-zero, the default is to insist that the value be used. If you include this option then you will permit the peer to override the entry of the node number.
ipxcp-accept-network
Accept the peer's NAK for the network number specified in the ipx-network option. If a network number was specified, and non-zero, the default is to insist that the value be used. If you include this option then you will permit the peer to override the entry of the node number.
ipxcp-accept-remote
Use the peer's network number specified in the configure request frame. If a node number was specified for the peer and this option was not specified, the peer will be forced to use the value which you have specified.
ipxcp-max-configure n
Set the maximum number of IPXCP configure request frames which the system will send to n. The default is 10.
ipxcp-max-failure n
Set the maximum number of IPXCP NAK frames which the local system will send before it rejects the options. The default value is 3.
ipxcp-max-terminate n
Set the maximum nuber of IPXCP terminate request frames before the local system considers that the peer is not listening to them. The default value is 3.
kdebug n
Enable debugging code in the kernel-level PPP driver. The argument values depend on the specific kernel driver, but in general a value of 1 will enable general kernel debug messages. (Note that these messages are usually only useful for debugging the kernel driver itself.) For the Linux 2.2.x kernel driver, the value is a sum of bits: 1 to enable general debug messages, 2 to request that the contents of received packets be printed, and 4 to request that the contents of transmitted packets be printed. On most systems, messages printed by the kernel are logged by syslog(1)? to a file as directed in the /etc/syslog.conf configuration file.
ktune
Enables pppd to alter kernel settings as appropriate. Under Linux, pppd will enable IP forwarding (i.e. set /proc/sys/net/ipv4/ip_forward to 1) if the proxyarp option is used, and will enable the dynamic IP address option (i.e. set /proc/sys/net/ipv4/ip_dynaddr to 1) in demand mode if the local address changes.
lcp-echo-failure n
If this option is given, pppd will presume the peer to be dead if n LCP echo-requests are sent without receiving a valid LCP echo-reply. If this happens, pppd will terminate the connection. Use of this option requires a non-zero value for the lcp-echo-interval parameter. This option can be used to enable pppd to terminate after the physical connection has been broken (e.g., the modem has hung up) in situations where no hardware modem control lines are available.
lcp-echo-interval n
If this option is given, pppd will send an LCP echo-request frame to the peer every n seconds. Normally the peer should respond to the echo-request by sending an echo-reply. This option can be used with the lcp-echo-failure option to detect that the peer is no longer connected.
lcp-max-configure n
Set the maximum number of LCP configure-request transmissions to n (default 10).
lcp-max-failure n
Set the maximum number of LCP configure-NAKs returned before starting to send configure-Rejects instead to n (default 10).
lcp-max-terminate n
Set the maximum number of LCP terminate-request transmissions to n (default 3).
lcp-restart n
Set the LCP restart interval (retransmission timeout) to n seconds (default 3).
linkname name
Sets the logical name of the link to name. Pppd will create a file named ppp-name.pid in /var/run (or /etc/ppp on some systems) containing its process ID. This can be useful in determining which instance of pppd is responsible for the link to a given peer system. This is a privileged option.
local
Don't use the modem control lines. With this option, pppd will ignore the state of the CD (Carrier Detect) signal from the modem and will not change the state of the DTR (Data Terminal Ready) signal.
logfd n
Send log messages to file descriptor n. Pppd will send log messages to at most one file or file descriptor (as well as sending the log messages to syslog), so this option and the logfile option are mutually exclusive. The default is for pppd to send log messages to stdout (file descriptor 1), unless the serial port is already open on stdout.
logfile filename
Append log messages to the file filename (as well as sending the log messages to syslog). The file is opened with the privileges of the user who invoked pppd, in append mode.
login
Use the system password database for authenticating the peer using PAP, and record the user in the system wtmp file. Note that the peer must have an entry in the /etc/ppp/pap-secrets file as well as the system password database to be allowed access.
maxconnect n
Terminate the connection when it has been available for network traffic for n seconds (i.e. n seconds after the first network control protocol comes up).
maxfail n
Terminate after n consecutive failed connection attempts. A value of 0 means no limit. The default value is 10.
modem
Use the modem control lines. This option is the default. With this option, pppd will wait for the CD (Carrier Detect) signal from the modem to be asserted when opening the serial device (unless a connect script is specified), and it will drop the DTR (Data Terminal Ready) signal briefly when the connection is terminated and before executing the connect script. On Ultrix, this option implies hardware flow control, as for the crtscts option.
mp
Enables the use of PPP multilink; this is an alias for the `multilink' option. This option is currently only available under Linux.
mpshortseq
Enables the use of short (12-bit) sequence numbers in multilink headers, as opposed to 24-bit sequence numbers. This option is only available under Linux, and only has any effect if multilink is enabled (see the multilink option).
mrru n
Sets the Maximum Reconstructed Receive Unit to n. The MRRU is the maximum size for a received packet on a multilink bundle, and is analogous to the MRU for the individual links. This option is currently only available under Linux, and only has any effect if multilink is enabled (see the multilink option).
ms-dns
If pppd is acting as a server for Microsoft Windows clients, this option allows pppd to supply one or two DNS (Domain Name Server) addresses to the clients. The first instance of this option specifies the primary DNS address; the second instance (if given) specifies the secondary DNS address. (This option was present in some older versions of pppd under the name dns-addr.)
ms-wins
If pppd is acting as a server for Microsoft Windows or
multilink
Enables the use of the PPP multilink protocol. If the peer also supports multilink, then this link can become part of a bundle between the local system and the peer. If there is an existing bundle to the peer, pppd will join this link to that bundle, otherwise pppd will create a new bundle. See the MULTILINK section below. This option is currently only available under Linux.
name name
Set the name of the local system for authentication purposes to name. This is a privileged option. With this option, pppd will use lines in the secrets files which have name as the second field when looking for a secret to use in authenticating the peer. In addition, unless overridden with the user option, name will be used as the name to send to the peer when authenticating the local system to the peer. (Note that pppd does not append the domain name to name.)
netmask n
Set the interface netmask to n, a 32 bit netmask in ''
noaccomp
Disable Address/Control compression in both directions (send and receive).
noauth
Do not require the peer to authenticate itself. This option is privileged.
nobsdcomp
Disables BSD-Compress compression; pppd will not request or agree to compress packets using the BSD-Compress scheme.
noccp
Disable CCP (Compression Control Protocol) negotiation. This option should only be required if the peer is buggy and gets confused by requests from pppd for CCP negotiation.
nocrtscts
Disable hardware flow control (i.e. RTS/CTS) on the serial port. If neither the crtscts nor the nocrtscts nor the cdtrcts nor the nocdtrcts option is given, the hardware flow control setting for the serial port is left unchanged.
nocdtrcts
This option is a synonym for nocrtscts. Either of these options will disable both forms of hardware flow control.
nodefaultroute
Disable the defaultroute option. The system administrator who wishes to prevent users from creating default routes with pppd can do so by placing this option in the /etc/ppp/options file.
nodeflate
Disables Deflate compression; pppd will not request or agree to compress packets using the Deflate scheme.
nodetach
Don't detach from the controlling terminal. Without this option, if a serial device other than the terminal on the standard input is specified, pppd will fork to become a background process.
noendpoint
Disables pppd from sending an endpoint discriminator to the peer or accepting one from the peer (see the MULTILINK section below). This option should only be required if the peer is buggy.
noip
Disable IPCP negotiation and IP communication. This option should only be required if the peer is buggy and gets confused by requests from pppd for IPCP negotiation.
noipv6
Disable IPv6CP negotiation and IPv6 communication. This option should only be required if the peer is buggy and gets confused by requests from pppd for IPv6CP negotiation.
noipdefault
Disables the default behaviour when no local IP address is specified, which is to determine (if possible) the local IP address from the hostname. With this option, the peer will have to supply the local IP address during IPCP negotiation (unless it specified explicitly on the command line or in an options file).
noipx
Disable the IPXCP and IPX protocols. This option should only be required if the peer is buggy and gets confused by requests from pppd for IPXCP negotiation.
noktune
Opposite of the ktune option; disables pppd from changing system settings.
nolog
Do not send log messages to a file or file descriptor. This option cancels the logfd and logfile options.
nomagic
Disable magic number negotiation. With this option, pppd cannot detect a looped-back line. This option should only be needed if the peer is buggy.
nomp
Disables the use of PPP multilink. This option is currently only available under Linux.
nompshortseq
Disables the use of short (12-bit) sequence numbers in the PPP multilink protocol, forcing the use of 24-bit sequence numbers. This option is currently only available under Linux, and only has any effect if multilink is enabled.
nomultilink
Disables the use of PPP multilink. This option is currently only available under Linux.
nopcomp
Disable protocol field compression negotiation in both the receive and the transmit direction.
nopersist
Exit once a connection has been made and terminated. This is the default unless the persist or demand option has been specified.
nopredictor1
Do not accept or agree to Predictor-1 compression.
noproxyarp
Disable the proxyarp option. The system administrator who wishes to prevent users from creating proxy ARP entries with pppd can do so by placing this option in the /etc/ppp/options file.
notty
Normally, pppd requires a terminal device. With this option, pppd will allocate itself a pseudo-tty master/slave pair and use the slave as its terminal device. Pppd will create a child process to act as a `character shunt' to transfer characters between the pseudo-tty master and its standard input and output. Thus pppd will transmit characters on its standard output and receive characters on its standard input even if they are not terminal devices. This option increases the latency and CPU overhead of transferring data over the ppp interface as all of the characters sent and received must flow through the character shunt process. An explicit device name may not be given if this option is used.
novj
Disable Van Jacobson style TCP/IP header compression in both the transmit and the receive direction.
novjccomp
Disable the connection-ID compression option in Van Jacobson style TCP/IP header compression. With this option, pppd will not omit the connection-ID byte from Van Jacobson compressed TCP/IP headers, nor ask the peer to do so.
papcrypt
Indicates that all secrets in the /etc/ppp/pap-secrets file which are used for checking the identity of the peer are encrypted, and thus pppd should not accept a password which, before encryption, is identical to the secret from the /etc/ppp/pap-secrets file.
pap-max-authreq n
Set the maximum number of PAP authenticate-request transmissions to n (default 10).
pap-restart n
Set the PAP restart interval (retransmission timeout) to n seconds (default 3).
pap-timeout n
Set the maximum time that pppd will wait for the peer to authenticate itself with PAP to n seconds (0 means no limit).
pass-filter filter-expression
Specifies a packet filter to applied to data packets being sent or received to determine which packets should be allowed to pass. Packets which are rejected by the filter are silently discarded. This option can be used to prevent specific network daemons (such as routed) using up link bandwidth, or to provide a basic firewall capability. The filter-expression syntax is as described for tcpdump(1), except that qualifiers which are inappropriate for a PPP link, such as ether and arp, are not permitted. Generally the filter expression should be enclosed in single-quotes to prevent whitespace in the expression from being interpreted by the shell. Note that it is possible to apply different constraints to incoming and outgoing packets using the inbound and outbound qualifiers. This option is currently only available under NetBSD, and then only if both the kernel and pppd were compiled with PPP_FILTER defined.
persist
Do not exit after a connection is terminated; instead try to reopen the connection. The maxfail option still has an effect on persistent connections.
plugin filename
Load the shared library object file filename as a plugin. This is a privileged option.
predictor1
Request that the peer compress frames that it sends using Predictor-1 compression, and agree to compress transmitted frames with Predictor-1 if requested. This option has no effect unless the kernel driver supports Predictor-1 compression.
privgroup group-name
Allows members of group group-name to use privileged options. This is a privileged option. Use of this option requires care as there is no guarantee that members of group-name cannot use pppd to become root themselves. Consider it equivalent to putting the members of group-name in the kmem or disk group.
proxyarp
Add an entry to this system's ARP
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