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why f5 send reply packet when client tried telnet:80

neeeewbie
MVP
MVP

 

Hi guys I need your help ! 

 

why f5's send reply(syn-ack) packet when client tried telnet:80?

but f5 does not have this ip

why f5 send reply ?? 

thank you

 

1 REPLY 1

SamCo
Cirrus
Cirrus

Hello,

Without extract of your configuraiton, it's hard to spot the exact reason.

Anyhow, the BigIP is a default deny device, so if there is syn ack, it mean you match something and you are not in the default behavior : maybe there is a virtual server listening on any ip (0.0.0.0/0) or a subnet that match the trafic, as described in this article : https://support.f5.com/csp/article/K14800

Cheers,

Sam