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Forum Discussion

Peter_125719's avatar
Peter_125719
Icon for Nimbostratus rankNimbostratus
Dec 15, 2012

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...
config
design
What_Lies_Bene1's avatar
What_Lies_Bene1
Icon for Cirrostratus rankCirrostratus
Dec 15, 2012
Assuming you've checked the MTU for the VLAN group, the best way to determine the source of the problem would be to do a tcpdump, using the client IP as a filter (assuming no SNAT is being used). Something like this: tcpdump -i any -nn -vv -s0 -X host x.x.x.x. Perhaps the Pool Member's IP MSS is set very low for some reason.