Differences between version 3 and previous revision of CiscoWiredCountryNotes.
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| Newer page: | version 3 | Last edited on Saturday, October 29, 2005 9:00:55 pm | by LindsayDruett | Revert |
| Older page: | version 2 | Last edited on Saturday, October 29, 2005 6:38:18 pm | by LindsayDruett | Revert |
@@ -1,13 +1,13 @@
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.
+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.
+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
