MTU is reduced to 576 when VS is attached
Hi,
I am a newcomer to BIG-IP. I have a LTM deployed in L2 mode by putting two untagged interface to one VLAN group.
Without attaching any VS, everything is normal and the MTU is 1500, from client side packet capture.
Once I attached a VS for redirecting HTTP, I can see from Wireshark on client machine that all packets from LTM is limited to MTU 576 (with Ethernet header, the packet size is 590).
I suspected the problem is from the pool members. So I shutdown all pool members and added fail open logic by detecting the active member (thanks to Aaron for answering my question posted on the iRules forum last night).
After this change, MTU from client side packet capture is still 576. I used the default HTTP profile in the VS.
I am using LTM VE BIG--IP-10.1.0.3341.1084.
Is this a known issue or I did something wrong?
Thanks a lot,
Peter