IMHO, your cable company has a badly designed network. I have a cable
modem as well, and it filters out all of the traffic which is not sent
to my IP address.
That is true. However, it seems like a good idea to filter that way. Will
this do the job?
iptables -P INPUT DROP
iptables -A INPUT -i eth0 -d ! 212.127.242.126 -j DROP
as the first rule of the input chain (and after that a dozen other rules)?
I am no hero when it comes to iptables (still a bit newbie) and it is a
bad thing when you think a firewall works when it does not.
Thanks,
Sebastiaan
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