This might be a stupid question but I was not able to google the right thing to find the answer.

How do I block all outgoing traffic from eth1 on Squid on the TCP level?

I have used the iptables rule below before when using Squid in Docker, not sure how to implement it without Docker.

iptables -t filter -I FORWARD -p tcp -o eth0 -m mark --mark 0x0c10f -j REJECT
  • Are you asking what filter might be appropriate in place of -m mark? Have you considered -m owner? – anx Oct 14 '20 at 0:43

From the squid box, block all outgoing traffic

$ sudo iptables -A OUTPUT -j DROP

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