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Chura_16140's avatar
Chura_16140
Icon for Nimbostratus rankNimbostratus
Nov 15, 2012

DNS Query - reply from unexpected source

Hi Guys,   I'm new to F5, and something annoy me i can't find why it happen.   My topology:   Network (Public IP - Pretend its 100.100.100.0/24) --> Switch Stack --> LAG --> Viprion LTM -->...
basic
getting started
new to f5
What_Lies_Bene1's avatar
What_Lies_Bene1
Icon for Cirrostratus rankCirrostratus
Nov 16, 2012
Hmmm. What VLAN are you using to take the tcpdump? If not the external one, can you restrict it to the external VLAN and see if it comes in as 53 and then gets changed by the F5?

 

 

Also, perhaps change the Virtual Server Source Port setting to Preserve Strict, just in case.