[c-nsp] About tcp window size

[Lincoln Dale (ltd)]

configuring "ip tcp window-size" on the router has nothing to do with
the IP packets being forwarded _through_ the router.

a client that cannot complete a TCP session is a classic symptom of an
incorrect MTU somewhere and PMTUD failing to perform its task.

is your topology really that simple as 3 devices in total?
what MTUs are configured?
what does a ping with sweep of increasing sizes (with DF bit set) show?
are you blocking ICMP traffic?


cheers,

lincoln.

> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-
> bounces at puck.nether.net] On Behalf Of Hiromasa Sekiguchi
> Sent: Wednesday, 5 September 2007 6:22 PM
> To: cisco-nsp at puck.nether.net
> Subject: [c-nsp] About tcp window size
> 
> Hello,
> 
> About below condition.
> 
> [client]------[cisco3745]-----[Web server]
> 
> When TCP connection starts between client and web server,
> they can't finish TCP connection.
> 
> The TCP windows scaling is configured with web server.
> 
> So, should we change the tcp window size on cisco3745?
> 
> e.g. cisco3745(config)#ip tcp window-size 750000
> 
> Regards,
> Hiromasa