after reinstalling Slackware due to some partition changes, my iptables work really strange and I'm unable to determine why.
After install, all 3 chains have an ACCEPT policy. But when I change the INPUT to DROP via
iptables -P INPUT DROP
, not only all incoming traffic is being dropped, but outcoming as well. No outcoming traffic at all. I can't even ping my home router. But the OUTPUT chain still has an ACCEPT policy and there are no other rules (except for
iptables -A INPUT -i lo -j ACCEPT
, but it makes no difference whether it is or isn't there). When I change INPUT to ACCEPT, all is well again. But that's not the way it should be...
What troubles me most is that before reinstall, iptables were working correctly with these rules. They even work on my other computer with exactly the same rules.
I googled around but found nothing than iptables guides which basically tell me that all should be fine.
Help me please...