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I'm running iptables v1.4.21 on Ubuntu 14.04 and is trying to setup iptables to use TPROXY.

How can I check whether my current build of iptables supports TPROXY? I can check TPROXY support for HAProxy using haproxy -vv, is there something similar for iptables?

If there is no TPROXY support, does a TPROXY patch exist for iptables v1.4.21? Or is another version of iptables more suitable?

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Just try to use it and if iptables returns you some error related to "module not found", then check the situation? :-)

At least in my Ubuntu 14.04 installation there seems to be xt_TPROXY.ko in /lib/modules/3.13.0-34-generic/kernel/net/netfilter/ directory so I presume Ubuntu has TPROXY support by default.

The iptables command itself does not contain support for anything, it merely uses the features compiled in to kernel (or kernel modules).

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