27 lines
999 B
Bash
27 lines
999 B
Bash
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#!/bin/sh
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IPT=/usr/sbin/iptables
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for T in filter nat mangle ; do
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$IPT -t $T -F
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$IPT -t $T -X
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done
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$IPT -t filter -A INPUT -m state --state INVALID -j DROP
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$IPT -t filter -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
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$IPT -t filter -A INPUT -p icmp -j ACCEPT
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$IPT -t filter -A INPUT -i vlan1 -p tcp -j REJECT --reject-with tcp-reset
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$IPT -t filter -A INPUT -i vlan1 -j REJECT --reject-with icmp-port-unreachable
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$IPT -t filter -A FORWARD -m state --state INVALID -j DROP
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$IPT -t filter -A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
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$IPT -t filter -A FORWARD -i vlan1 -m state --state NEW,INVALID -j DROP
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$IPT -t nat -A POSTROUTING -o vlan1 -j MASQUERADE
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echo "1" >/proc/sys/net/ipv4/ip_forward
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echo "1" >/proc/sys/net/ipv4/icmp_echo_ignore_broadcasts
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echo "1" >/proc/sys/net/ipv4/icmp_ignore_bogus_error_responses
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echo "30" >/proc/sys/net/ipv4/tcp_fin_timeout
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echo "120" >/proc/sys/net/ipv4/tcp_keepalive_time
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echo "0" >/proc/sys/net/ipv4/tcp_timestamps
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