Differences between version 2 and previous revision of CiscoWiredCountryNotes.
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| Newer page: | version 2 | Last edited on Saturday, October 29, 2005 6:38:18 pm | by LindsayDruett | Revert |
| Older page: | version 1 | Last edited on Saturday, October 29, 2005 6:35:38 pm | by LindsayDruett | Revert |
@@ -1,20 +1,20 @@
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 hosts
are reachable.
+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 1436
(MTU minus the size of the IP, TCP, and GRE headers). The end hosts now send TCP/IP packets no larger than this value.
+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>
----
-Cisco Config to connect a Cisco router to WiredCountry. This only includes to the external interface connection to WiredCountry.
+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
@@ -23,8 +23,9 @@
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
@@ -54,7 +55,8 @@
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>
