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Forum Discussion

1qaz's avatar
1qaz
Icon for Nimbostratus rankNimbostratus
May 08, 2020

I want to get the source port but it was changed by F5?

Hi,I have a question for help: I have a VS1 on BIGIP 3900, I want the source port of the client to be kept, but I observed that the client'port all be changed by F5: (tmos)# show sys connection cs-...
application delivery
BIG-IP
LTM
Mayur_Sutare's avatar
Mayur_Sutare
Icon for MVP rankMVP
May 08, 2020

Then it may be the case source port coming is already used for SNAT, in this case system uses a different port and this is default behavior.

 

Mayur

1qaz's avatar
1qaz
Icon for Nimbostratus rankNimbostratus
May 08, 2020

thanks for reply,Do you mean that the client's port has been changed by SNAT before it reached F5, or does it mean the SNAT of F5 itself? SNAT is not configured on VS1 and VS2. The configuration of the two VS is the same, the only difference is that the number of connections of VS1 will exceed 10,000 and the number of connections of VS2 is only about 200