EOIP fragmentation ?

[aflbakker]

Hi,

Currently we are experiencing excessive traffic fragmentation between the Foreign and Anchor WLC's.

Due to the fragmentation the firewalls are having a high CPU load and are facing performance issues.

Because of this I've changed the TCP MSS to 1363 but this only takes care of the CAPWAP overhead (AP <-> WLC).

What is the overhead of the EOIP tunnel between the foreign and anchor WLC and are there ways to decrease the MTU size so that there will be no (or less) fragmentation ?

Grtz.

[Saurav Lodh]

Well, I don't think its quite abnormal here. Had the fragmentation been more , the Firewall would have dropped the packets considering it as DOS, eg. our ASA allows maximum of 24 fragmentation. However, the fragmentation which you are facing , is quite normal for Firewall and it should have handled it quite easily.

[Reuben Farrelly]

Saurav - what's the reason behind the wireless code not supporting a >1500 byte MTU between WLCs and APs or at least an adjustable MTU on all interfaces?  Given the hardware likely supports larger frames wouldn't this be a good way to optimise traffic between the various elements in a CUWN?