Some iptables rules are not working on Ubuntu 8.10 server
On Ubuntu 8.10 server, I want to deny any attempt of a connection by the server to any other host on the home network. This includes PING as well. I set up a number of rules though ufw, enabled it and rebooted and I can still connect to other machines. In the following output from ufw status, 172.25.25.211 is Ubuntu and 172.25.25.16 is the other host. I can still communicate between the two on port 80 and by ICMP and believe that ufw/iptables is working because the two statements concerning ports 22 and 80 take effect.
To Action From -- ------ ---- 22/tcp ALLOW Anywhere 80/tcp ALLOW Anywhere 172.25.25.16 DENY 172.25.25.211 172.25.25.211 DENY 172.25.25.16 Anywhere DENY 172.25.25.16 Saved iptables rules: # Generated by iptables-save v1.4.0 on Tue Feb 3 23:15:19 2009 *filter :INPUT DROP [107:9343] :FORWARD DROP [0:0] :OUTPUT ACCEPT [840:50760] :ufw-after-forward - [0:0] :ufw-after-input - [0:0] :ufw-after-output - [0:0] :ufw-before-forward - [0:0] :ufw-before-input - [0:0] :ufw-before-output - [0:0] :ufw-not-local - [0:0] :ufw-user-forward - [0:0] :ufw-user-input - [0:0] :ufw-user-limit - [0:0] :ufw-user-limit-accept - [0:0] :ufw-user-output - [0:0] -A INPUT -j ufw-before-input -A INPUT -j ufw-after-input -A FORWARD -j ufw-before-forward -A FORWARD -j ufw-after-forward -A OUTPUT -j ufw-before-output -A OUTPUT -j ufw-after-output -A ufw-after-forward -m limit --limit 3/min --limit-burst 10 -j LOG --log-prefix "[UFW BLOCK FORWARD]: " -A ufw-after-forward -j RETURN -A ufw-after-input -p udp -m udp --dport 137 -j RETURN -A ufw-after-input -p udp -m udp --dport 138 -j RETURN -A ufw-after-input -p tcp -m tcp --dport 139 -j RETURN -A ufw-after-input -p tcp -m tcp --dport 445 -j RETURN -A ufw-after-input -p udp -m udp --dport 67 -j RETURN -A ufw-after-input -p udp -m udp --dport 68 -j RETURN -A ufw-after-input -m addrtype --dst-type BROADCAST -j RETURN -A ufw-after-input -m limit --limit 3/min --limit-burst 10 -j LOG --log-prefix "[UFW BLOCK INPUT]: " -A ufw-after-input -j RETURN -A ufw-after-output -j RETURN -A ufw-before-forward -j ufw-user-forward -A ufw-before-forward -j RETURN -A ufw-before-input -i lo -j ACCEPT -A ufw-before-input -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT -A ufw-before-input -m conntrack --ctstate INVALID -j DROP -A ufw-before-input -p icmp -m icmp --icmp-type 3 -j ACCEPT -A ufw-before-input -p icmp -m icmp --icmp-type 4 -j ACCEPT -A ufw-before-input -p icmp -m icmp --icmp-type 11 -j ACCEPT -A ufw-before-input -p icmp -m icmp --icmp-type 12 -j ACCEPT -A ufw-before-input -p icmp -m icmp --icmp-type 8 -j ACCEPT -A ufw-before-input -p udp -m udp --sport 67 --dport 68 -j ACCEPT -A ufw-before-input -j ufw-not-local -A ufw-before-input -s 224.0.0.0/4 -j ACCEPT -A ufw-before-input -d 224.0.0.0/4 -j ACCEPT -A ufw-before-input -j ufw-user-input -A ufw-before-input -j RETURN -A ufw-before-output -o lo -j ACCEPT -A ufw-before-output -p tcp -m state --state NEW,RELATED,ESTABLISHED -j ACCEPT -A ufw-before-output -p udp -m state --state NEW,RELATED,ESTABLISHED -j ACCEPT -A ufw-before-output -j ufw-user-output -A ufw-before-output -j RETURN -A ufw-not-local -m addrtype --dst-type LOCAL -j RETURN -A ufw-not-local -m addrtype --dst-type MULTICAST -j RETURN -A ufw-not-local -m addrtype --dst-type BROADCAST -j RETURN -A ufw-not-local -m limit --limit 3/min --limit-burst 10 -j LOG --log-prefix "[UFW BLOCK NOT-TO-ME]: " -A ufw-not-local -j DROP -A ufw-user-forward -j RETURN -A ufw-user-input -p tcp -m tcp --dport 22 -j ACCEPT -A ufw-user-input -p tcp -m tcp --dport 80 -j ACCEPT -A ufw-user-input -s 172.25.25.211/32 -d 172.25.25.16/32 -j DROP -A ufw-user-input -s 172.25.25.16/32 -d 172.25.25.211/32 -j DROP -A ufw-user-input -s 172.25.25.16/32 -j DROP -A ufw-user-input -j RETURN -A ufw-user-limit -m limit --limit 3/min -j LOG --log-prefix "[UFW LIMIT]: " -A ufw-user-limit -j REJECT --reject-with icmp-port-unreachable -A ufw-user-limit-accept -j ACCEPT -A ufw-user-output -j RETURN COMMIT What am I overlooking? Thanks |
Quote:
Code:
iptables -I OUTPUT -o $LAN_IFACE -d $LAN_NET -m state --state NEW -j REJECT |
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