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1 perry 1 nmtrapd
2 !!!nmtrapd
3 NAME
4 SYNOPSIS
5 DESCRIPTION
6 PROTOCOL
7 SEE ALSO
8 AUTHORS
9 ----
10 !!NAME
11
12
13 nmtrapd - A network management SNMP trap multiplexer.
14 !!SYNOPSIS
15
16
17 __nmtrapd__ [[ ''port'' ]
18
19
20 ________________________________________________________________________________________________________________________________________
21 !!DESCRIPTION
22
23
24 The __nmtrapd__ trap daemon listens on the snmp-trap port
25 (usually port 162/udp) for incoming SNMP trap or inform
26 messages and forwards them to all connected clients (like
27 __scotty__). The optional ''port'' argument allows to
28 use the nmtrapd daemon to forward messages received on a non
29 standard SNMP trap port. Port numbers below 1024 will be
30 rejected with the exception of the snmp-trap port
31 162/udp.
32
33
34 The __nmtrapd__ daemon must be installed setuid root
35 since UNIX systems require root permissions to open the
36 standard SNMP trap port 162/udp. The __nmtrapd__ daemon
37 rejects all ''port'' numbers below 1024 with the
38 exception of port 162/udp in order to protect the system
39 security.
40
41
42 Clients connect to the __nmtrapd__ daemon by opening the
43 AF_UNIX domain stream socket /tmp/.nmtrapd-''port''.
44 Thus, the default AF_UNIX domain stream socket is named
45 /tmp/.nmtrapd-162.
46 !!PROTOCOL
47
48
49 Received messages are forwarded using the following packet
50 format:
51
52
53 0 7 8 15 16 23 24 32
54 +--------+--------+--------+--------+
55 | version| unused | port number |
56 +--------+--------+--------+--------+
57 | IPv4 address of the sender |
58 +--------+--------+--------+--------+
59 | length of the trap message |
60 +--------+--------+--------+--------+
61 | trap message |
62 : : : : :
63 +--------+--------+--------+--------+
64
65
66 The value of the version field is 0 and all the unused bits
67 are set to 0. The port number and the length of the trap
68 message are returned in network byte order.
69 !!SEE ALSO
70
71
72 scotty(1), tkined(1), Tnm(n)
73 !!AUTHORS
74
75
76 Erik Schoenfelder
77 Juergen Schoenwaelder
78 ----
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