5 for T in filter nat mangle ; do
10 $IPT -t filter -A INPUT -m state --state INVALID -j DROP
11 $IPT -t filter -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
12 $IPT -t filter -A INPUT -p icmp -j ACCEPT
13 $IPT -t filter -A INPUT -i vlan1 -p tcp -j REJECT --reject-with tcp-reset
14 $IPT -t filter -A INPUT -i vlan1 -j REJECT --reject-with icmp-port-unreachable
15 $IPT -t filter -A FORWARD -m state --state INVALID -j DROP
16 $IPT -t filter -A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
17 $IPT -t filter -A FORWARD -i vlan1 -m state --state NEW,INVALID -j DROP
19 $IPT -t nat -A POSTROUTING -o vlan1 -j MASQUERADE
21 echo "1" >/proc/sys/net/ipv4/ip_forward
22 echo "1" >/proc/sys/net/ipv4/icmp_echo_ignore_broadcasts
23 echo "1" >/proc/sys/net/ipv4/icmp_ignore_bogus_error_responses
24 echo "30" >/proc/sys/net/ipv4/tcp_fin_timeout
25 echo "120" >/proc/sys/net/ipv4/tcp_keepalive_time
26 echo "0" >/proc/sys/net/ipv4/tcp_timestamps