Greetings, Pardon if this is a dumb question. But I have searched the web, and the source code for a solution to this one and have reached a brick wall. I'm upgrading a user-space proxy (squid3) which has in the past done transparent connections under IPv4-only using SO_ORIGINAL_DST. The Firewall/router uses iptables and REDIRECT port 80 outbound to port 81. All is fine and dandy when squid listens on 0.0.0.0:81. With the new code I have to use an IPv6 socket ( [::]:81 ) as the receiver. With that getsockopt(..., SO_ORIGINAL_DST, ...) always returns err "92 Protocol not supported." regardless of the IP-level parameters passed in. NOTE: All traffic for testing so far has been from IPv4 clients to what they think is an IPv4 server, but with a dual-enabled middleman. The 'middleman' Software is iptables 1.3.6 on Debian 2.6.21-2-486 (unstable), squid3 built with g++ 4.1.3. Can anyone point me in the right direction for a solution that will work? Ideally one that is protocol-independant, but anything is welcome even an 'upgrade to X'. Amos Jeffries Squid3 Development Team
