Mar 27, 2026 - For details about updated CVE-2025-53521 (BIG-IP APM vulnerability), refer to K000156741.

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jdscrymgeour_42's avatar
jdscrymgeour_42
Icon for Nimbostratus rankNimbostratus
Nov 22, 2011

source port translation/ port pool

I need to either restrict the source ports used when snatting to specific ports per rule or set up a pool for a specific SNAT, I cannot see if this is possible to do if anyone can help?     Than...
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nitass's avatar
nitass
Icon for Employee rankEmployee
Nov 22, 2011
is it something like this? or do i misunderstand what you are asking? 

[root@ve1023:Active] config  b virtual bar list
virtual bar {
   snat automap
   pool foo
   destination 172.28.19.79:80
   ip protocol 6
   rules myrule
}
[root@ve1023:Active] config  b pool foo list
pool foo {
   members 200.200.200.101:80 {}
}
[root@ve1023:Active] config  b rule myrule list
rule myrule {
   when CLIENT_ACCEPTED {
        if {[IP::addr [IP::client_addr] equals 172.28.19.251/32]}{
                snat 200.200.200.222 2222
        }
}
}
[root@ve1023:Active] config  b snat translation list
snat translation 200.200.200.222 {}

[root@ve1023:Active] config  tcpdump -nni 0.0 port 80
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on 0.0, link-type EN10MB (Ethernet), capture size 108 bytes
17:33:08.241129 IP 172.28.19.251.36749 > 172.28.19.79.80: S 87059803:87059803(0) win 5840 
17:33:08.241177 IP 172.28.19.79.80 > 172.28.19.251.36749: S 3835525115:3835525115(0) ack 87059804 win 4380 
17:33:08.241895 IP 172.28.19.251.36749 > 172.28.19.79.80: . ack 1 win 46 
17:33:08.241971 IP 200.200.200.222.2222 > 200.200.200.101.80: S 3823560177:3823560177(0) win 4380 
17:33:08.241977 IP 172.28.19.251.36749 > 172.28.19.79.80: P 1:156(155) ack 1 win 46 
17:33:08.243959 IP 200.200.200.101.80 > 200.200.200.222.2222: S 2304621412:2304621412(0) ack 3823560178 win 5792 
17:33:08.243972 IP 200.200.200.222.2222 > 200.200.200.101.80: . ack 1 win 4380 
17:33:08.243985 IP 200.200.200.222.2222 > 200.200.200.101.80: P 1:156(155) ack 1 win 4380 
17:33:08.244979 IP 200.200.200.101.80 > 200.200.200.222.2222: . ack 156 win 54 
17:33:08.246933 IP 200.200.200.101.80 > 200.200.200.222.2222: P 1:263(262) ack 156 win 54 
17:33:08.246944 IP 172.28.19.79.80 > 172.28.19.251.36749: P 1:263(262) ack 156 win 4535 
17:33:08.246948 IP 200.200.200.101.80 > 200.200.200.222.2222: F 263:263(0) ack 156 win 54 
17:33:08.246954 IP 200.200.200.222.2222 > 200.200.200.101.80: . ack 264 win 4642 
17:33:08.246958 IP 172.28.19.79.80 > 172.28.19.251.36749: F 263:263(0) ack 156 win 4535 
17:33:08.247870 IP 172.28.19.251.36749 > 172.28.19.79.80: . ack 263 win 54 
17:33:08.248824 IP 172.28.19.251.36749 > 172.28.19.79.80: F 156:156(0) ack 264 win 54 
17:33:08.248842 IP 172.28.19.79.80 > 172.28.19.251.36749: . ack 157 win 4535 
17:33:08.248847 IP 200.200.200.222.2222 > 200.200.200.101.80: F 156:156(0) ack 264 win 4642 
17:33:08.249822 IP 200.200.200.101.80 > 200.200.200.222.2222: . ack 157 win 54