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Notes for using a Cisco router to connect to WiredCountry. ---- With connecting up a customer to [WiredCountry], some hosts, irrespective of what Operating System they are running, will not load most web pages, send/recieve email, yet the sites are reachable when pinging them. This is because the [MTU] sizes are reduced and depending on the route path will depend on the [MTU]. For example www.wired.net.nz maximum reachable frame size is 996 bytes. Some network cards will automatically work around the problem, others won't. The workaround solution on a Cisco router is to change the TCP [MSS] option value on SYN packets that traverse through the router (available in IOS 12.2(4)T and higher). This reduces the [MSS] option value in the TCP SYN packet so that it's smaller than the value in the ip tcp adjust-mss value command, in this case 990 ([MTU] minus the size of the IP, TCP, and GRE headers). The end hosts now send TCP/IP packets no larger than this value. <pre> interface Dialer0 ip tcp adjust-mss 990 </pre> ---- Sample Cisco Config to connect a Cisco router to WiredCountry. This only includes to the external interface connection to WiredCountry. <pre> interface Ethernet1 description Wired Country Broadband Network no ip address ! Set the load-interval at 30 Secs so that usage graphing is more accurate load-interval 30 pppoe enable pppoe-client dial-pool-number 1 hold-queue 100 out ! ! interface Dialer0 description Internet Connection to Wired Country ip address negotiated ! Entries for the FW/ACLs/IDS/IPS ip access-group Internet in ip inspect Internet in ip ips Internet in ! Security Essentials ip verify unicast reverse-path ip virtual-reassembly no ip redirects no ip unreachables no ip proxy-arp no cdp enable ! Frame size adjustments ip mtu 1492 ip tcp adjust-mss 996 ! Assuming that you're running NAT ip nat outside ! Set the load-interval at 30 Secs so that usage graphing is more accurate load-interval 30 ! And your PPP encapsualtion/authenication encapsulation ppp dialer pool 1 dialer-group 1 ppp chap hostname <<username>>@wiredcountry.net.nz ppp chap password <<password>> ppp pap sent-username <<username>>@wiredcountry.net.nz password <<password>> ! Plus extras hold-queue 100 out ! ! dialer-list 1 protocol ip permit </pre> For routers that use an IOS image older than 12.2(13)T image will also need the following configuration commands added in the configuration. <pre> vpdn enable no vpdn logging ! vpdn-group pppoe request-dialin protocol pppoe </pre>
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