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schmal_111133's avatar
schmal_111133
Icon for Nimbostratus rankNimbostratus
Feb 13, 2013

specific source port translation

Hi,   I am trying to do SNAT while selecting a specific port for that but for some reason when the F5 receive the response it is sending a RST to the WS and not retranslating it to the original IP...
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nitass's avatar
nitass
Icon for Employee rankEmployee
Feb 15, 2013
bigip sent reset (pkt 6) because syn-ack (pkt 5) was handled by different tmm. you could see syn (pkt 4) was sent out by tmm0 but syn-ack (pkt 5) was received by tmm1. how did you disable cmp? 

No.     Time                       Delta Time  Source                Src port Destination           Protocol Dst port Window     BiF        Vlan id Length Info
      1 2013-02-15 18:34:21.759542 0.000000    10.159.121.107        1576     10.106.12.174         TCP      80       64512                 85      88     IN  s0/tmm0 : 1576 > 80 [SYN] Seq=389855322 Win=64512 Len=0 MSS=1237 SACK_PERM=1
      2 2013-02-15 18:34:21.759574 0.000032    10.106.12.174         80       10.159.121.107        TCP      1576     3711                  85      88     OUT s0/tmm0 : 80 > 1576 [SYN, ACK] Seq=1141266970 Ack=389855323 Win=3711 Len=0 MSS=1460 SACK_PERM=1
      3 2013-02-15 18:34:21.903207 0.143633    10.159.121.107        1576     10.106.12.174         TCP      80       64512                 85      86     IN  s0/tmm0 : 1576 > 80 [ACK] Seq=389855323 Ack=1141266971 Win=64512 Len=0
      4 2013-02-15 18:34:21.903264 0.000057    10.106.12.178         12345    10.106.12.40          TCP      8080     4380                  85      92     OUT s0/tmm0 : 12345 > 8080 [SYN] Seq=2863642582 Win=4380 Len=0 MSS=1460 WS=1 SACK_PERM=1
      5 2013-02-15 18:34:21.903472 0.000208    10.106.12.40          8080     10.106.12.178         TCP      12345    65535                 85      92     IN  s0/tmm1 : 8080 > 12345 [SYN, ACK] Seq=1064416826 Ack=2863642583 Win=65535 Len=0 MSS=1460 WS=1 SACK_PERM=1
      6 2013-02-15 18:34:21.903494 0.000022    10.106.12.178         12345    10.106.12.40          TCP      8080     0                     85      80     OUT s0/tmm1 : 12345 > 8080 [RST, ACK] Seq=2863642583 Ack=1064416827 Win=0 Len=0