Forum Discussion
neeeewbie
Mar 02, 2022MVP
why f5 send reply packet when client tried telnet:80
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
SamCo
Mar 02, 2022Cirrus
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
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