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ReWrite_132188's avatar
ReWrite_132188
Icon for Nimbostratus rankNimbostratus
Jul 02, 2014

F5 BIG-IP answers with a self-ip that is not associated with that VLAN

Hi, I am working on implementing av proxy-solution with the help of F5 BIG-IP to do SSL-decrypt. In short: Users surf the web, and the traffic hits the F5 internal VLAN over a fiber-trunk(2.1 and...
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ReWrite_132188's avatar
ReWrite_132188
Icon for Nimbostratus rankNimbostratus
Jul 07, 2014

This is tcpdump data from the vs_proxy_return VLAN on int 1.2 on the BIG-IP.

I tried pinging and a regualar http request to www.vg.no.

13:44:46.673086 IP 185.32.91.150.lm-webwatcher > 195.88.55.16.http: S 1736017643:1736017643(0) win 8192 
13:44:49.670161 IP 185.32.91.150.lm-webwatcher > 195.88.55.16.http: S 1736017643:1736017643(0) win 8192 
13:44:50.406559 IP 192.168.252.12 > 185.32.91.150: ICMP host 195.88.55.16 unreachable, length 36
13:44:50.406579 IP 192.168.252.12 > 185.32.91.150: ICMP host 195.88.55.16 unreachable, length 36
13:44:50.406700 IP 185.32.91.150.lm-webwatcher > 195.88.55.16.http: R 1736017644:1736017644(0) ack 0 win 0
13:44:50.918318 IP 185.32.91.150.lm-webwatcher > 195.88.55.16.http: S 1736017643:1736017643(0) win 8192 
13:45:01.958484 IP 185.32.91.150.lm-webwatcher > 195.88.55.16.http: R 0:0(0) ack 1 win 0
13:45:01.958718 IP 195.88.55.16.http > 185.32.91.150.lm-webwatcher: R 1:1(0) ack 0 win 0
13:45:01.960035 IP 185.32.91.150.8209 > 195.88.54.16.http: S 1052416606:1052416606(0) win 8192 
13:45:04.974016 IP 185.32.91.150.8209 > 195.88.54.16.http: S 1052416606:1052416606(0) win 8192 
13:45:07.960917 IP 192.168.252.12 > 185.32.91.150: ICMP host 195.88.54.16 unreachable, length 36
13:45:07.960939 IP 185.32.91.150.8209 > 195.88.54.16.http: R 1052416607:1052416607(0) ack 0 win 0
13:45:07.960951 IP 192.168.252.12 > 185.32.91.150: ICMP host 195.88.54.16 unreachable, length 36
13:45:08.468489 IP 185.32.91.150.8209 > 195.88.54.16.http: S 1052416606:1052416606(0) win 8192 
13:45:15.049547 IP 185.32.91.150.8209 > 195.88.54.16.http: R 0:0(0) ack 1 win 0
13:45:15.049687 IP 195.88.54.16.http > 185.32.91.150.8209: R 1:1(0) ack 0 win 0