Re: Route packets from an interface to another

[Rudi Starcevic <tech@wildcash.com>]

Hi,

I do something like this with the script below.

Please let me know if you see a better way to do this
than I am using below.

Thanks.
Kind regards,
Rudi.


#!/bin/sh

echo "Network Setup Start"

echo "Flushing NICs"
ip addr flush eth0
ip addr flush eth1

ip link set eth0 down
ip link set eth1 down

ip link set eth0 up
ip link set eth1 up

echo "Flushing NetFilter"
iptables -F
iptables -t nat -F

echo "Routing Tables:"
cat /etc/iproute2/rt_tables

echo "Setup NIC 0"
ip addr add 192.168.2.7/24 dev eth0 brd +

echo "Setup NIC 1"
ip addr add 192.168.3.7/24 dev eth1 brd +

ip addr list
ip route list

echo "Setup Default Route [ inet table ]"
ip route add default via 192.168.2.1 proto static table inet

echo "Setup LAN Route [ implan table ]"
ip route add 192.168.3/24 via 192.168.3.7 proto static table implan

ip route list

echo "Setup LAN ip rule"
ip rule add to 192.168.3/24 prio 16000 table implan

echo "Setup Internet ip rule"
ip rule add to 0/0 prio 17000 table inet

echo "Enable Kernel Forwarding"
echo "1" > /proc/sys/net/ipv4/ip_forward

echo "Enable NetFilter Forwarding"
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE

echo "Flushing ip route cache"
ip route flush cache

#iptables -vL
#iptables -t nat -vL

exit 0