North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: PPPOE, MTU, and boom.
> This section describes possibly unexpected behavior that are resolved > in Release 12.2(2)XH. > > CSCds69577 > > 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 is 1492. 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 and quicken.
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