Command of the Day

Aruba Employee

COTD: Enable PPoE MSS clamping

Did you know about this command?
(Greig) (config) #ip pppoe-max-segment-size
Note: Introduced in 2.5.3.
When the Aruba switch is being a PPPoE client (you knew it could do this nowadays right?) then this command enables PPPoE MSS clamping.
What's PPPoE MSS clamping?
Well, when a client cannot use Path MTU discovery because somebody has blocked/filtered ICMP, then you can run into issues sending large packets. MSS clamping is a way for the PPPoE client to limit the maximum segment size (and hence maximum single packet size) to be small enough to pass through devices that cannot fragment and cannot tell you that they won't fragment.
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