Does anyone know the answer to this one???
I'm configuring a firewall that's got an eth0 link to the internet & an eth1 link to an internal subnet (172.16.2.0).
I've put in this rule to stop all ssh access to a PC (188.8.131.52) on the subnet via the firewall:
iptables -A FORWARD -p tcp -s 0/0 -d 172.16.2.120 --dport 22 -j DROP
however, this rule is still allowing other PCs on the subnet to connect to the PC. I've also tried the following rules, even to the point of specify an individual source PC on the subnet & dropping all ssh traffic to the destination PC & changing the FORWARD policy to DROP:
iptables -A FORWARD -p tcp -s 172.16.2.0/24 -d 172.16.2.120 --dport 22 -j DROP
iptables -A FORWARD -p tcp -s 172.16.2.220 -d 172.16.2.120 --dport 22 -j DROP
iptables -A FORWARD -p tcp -d 172.16.2.120 --dport -j DROP
iptables -P FORWARD DROP
Yet i can still contact the destination PC from another PC on the subnet. I've read & read & read till I'm blue in the face & can't for the life in me figure out why this isn't working!!
Does anybody have any suggestions???