I'm looking for the limits on a l2tpv3 xconnect layer2 connection of the cisco 881 by means of a lab setup.
2 cisco 881 directly connected to each other with their Fa4
the Fa3 in a vlan, with the vlan interface xconnected to the other cisco. ipsec is not used yet
so far I learned that fragmentation takes down the receiving cisco (who was to defragment the packet).
If I lower the MTU on the testing pc (connected to Fa3), I get full 100mbit performance.
If I raise the MTU of both the Fa4 interfaces (something I am suprised is possible, since this is not gig) I get 50 mbit performance. And I wonder why, because the cisco is not doing fragmentation anymore, (confirmed in debug).
Does the cisco switch back to cpu performance instead of HW performance is you raise the MTU?
how do you explain the possibility of raising the MTU on a Fa interface?
using Version 15.2(2)T in adv ip services licencing (trial)
relevant config, reason why choosen manual l2tp is becauce once working like expected, one cisco is going to be replaced by linux
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