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