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Re: PPPOE, MTU, and boom.
- From: Alex Rubenstein
- Date: Thu Jul 19 01:09:55 2001
> This section describes possibly unexpected behavior that are resolved
> in Release 12.2(2)XH.
> Starting with Release 12.2(2)XH, you can resolve this problem by
> changing the value of the maximum segment size (MSS) contained
> in the MTU to 1492 or less. Use the following IOS command:
> ip tcp adjust-mss mss
> where mss is 1492 or less.
Post-mortem: this seems to work. Hoever, mss is 1460 or less, assuming mtu
dsl1.ahr(config-if)#ip tcp adjust-mss ?
<500-1460> Maximum segment size in bytes
Key (which took me a moment to figure out): the mss MUST be AT LEAST 32
bytes or more less than MTU; for a while, I had MTU set to 1400 on the
aggregation side, and didn't realise it, and this didn't work. As soon as
I upped the MTU to 1492, all started working, including all broken sites