По iptables настройки таковы...

# Generated by iptables-save v1.2.11 on Mon Apr 10 20:03:23 2006
*mangle
:PREROUTING ACCEPT [177632788:76155996988]
:INPUT ACCEPT [5998809:601999049]
:FORWARD ACCEPT [163699906:74924449534]
:OUTPUT ACCEPT [1831777:764084046]
:POSTROUTING ACCEPT [165762160:75565966700]
COMMIT
# Completed on Mon Apr 10 20:03:23 2006
# Generated by iptables-save v1.2.11 on Mon Apr 10 20:03:23 2006
*filter
:INPUT DROP [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT DROP [0:0]
:ALLOW_ICMP - [0:0]
:ALLOW_PORTS - [0:0]
:CHECK_FLAGS - [0:0]
:DENY_PORTS - [0:0]
:DST_EGRESS - [0:0]
:KEEP_STATE - [0:0]
:SRC_EGRESS - [0:0]
-A INPUT -p tcp -m tcp ! --tcp-flags SYN,RST,ACK SYN -m state --state NEW -j DROP
-A INPUT -s 80.80.80.80 -j ACCEPT
-A INPUT -i ppp+ -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -i eth0 -m state --state RELATED,ESTABLISHED -j ACCEPT
-A INPUT -p icmp -j ACCEPT
-A INPUT -s 192.168.10.0/255.255.255.0 -p udp -m udp --sport 53 -j ACCEPT
-A FORWARD -j QUEUE
-A FORWARD -i ppp+ -j ACCEPT
-A FORWARD -i ppp+ -p icmp -j ACCEPT
-A OUTPUT -o ppp+ -j ACCEPT
-A OUTPUT -d 80.80.80.80 -j ACCEPT
-A OUTPUT -o lo -j ACCEPT
-A OUTPUT -o eth0 -m state --state RELATED,ESTABLISHED -j ACCEPT
-A OUTPUT -s 80.80.80.80 -p udp -m udp --dport 53 -j ACCEPT
-A OUTPUT -p icmp -j ACCEPT
-A OUTPUT -o eth0 -m state --state RELATED,ESTABLISHED -j ACCEPT
COMMIT
# Completed on Mon Apr 10 20:03:23 2006
# Generated by iptables-save v1.2.11 on Mon Apr 10 20:03:23 2006
*nat
:PREROUTING ACCEPT [50133:3577269]
:POSTROUTING ACCEPT [29:2755]
:OUTPUT ACCEPT [8063:585322]
-A POSTROUTING -s 192.168.10.0/255.255.255.0 -o eth0 -j MASQUERADE
COMMIT
# Completed on Mon Apr 10 20:03:23 2006