I've just tested squid 3.1.0.16 on kernel 2.6.32.7 aqnd the result using tproxy is: 2010/02/04 18:35:34.711| Processing: 'http_port 3129 tproxy' 2010/02/04 18:35:34.711| http(s)_port: found Listen on Port: 3129 2010/02/04 18:35:34.711| http(s)_port: found Listen on wildcard address: [::]:3129 2010/02/04 18:35:34.711| Starting IP Spoofing on port [::]:3129 2010/02/04 18:35:34.711| Disabling Authentication on port [::]:3129 (IP spoofing enabled) 2010/02/04 18:35:34.711| Detect TPROXY support on port [::]:3129 2010/02/04 18:35:34.711| ...Probing for IPv6 TPROXY support. 2010/02/04 18:35:34.711| FATAL: http(s)_port: TPROXY support in the system does not work. 2010/02/04 18:35:34.711| leave_suid: PID 711 called 2010/02/04 18:35:34.711| leave_suid: PID 711 giving up root, becoming 'squid' FATAL: Bungled squid.conf line 2: http_port 3129 tproxy Squid Cache (Version 3.1.0.16): Terminated abnormally. CPU Usage: 0.014 seconds = 0.008 user + 0.006 sys Maximum Resident Size: 23056 KB Page faults with physical i/o: 0 seems like there is no condition to jump over IPv6 failure , am i right? it did not get to IPv4 tproxy support. -- View this message in context: http://n4.nabble.com/Squid3-1-TProxy-weirdness-tp1042775p1468938.html Sent from the Squid - Users mailing list archive at Nabble.com.