Matevz Langus írta:
Does anyone know how to change ip source address when entering Linux
interface to something else and when leaving out the same interface
(backwards) changing it back.
The problem is this:
I have 10 devices with the same IP address, 192.168.1.1. They are
connected to ethernet switch, which adds VLAN TAG to packets from each
device. Linux box is connected to the switch. It is possible to create
10 VLAN interfaces on the Linux box and only one 192.168.1.1 address
will be seen per interface. In order to establish TCP connections to
all devices at the same time, source address must be altered.
on eth0.10, INPUT SRC 192.168.1.1 -> 192.168.10.1
on eth0.10, OUTPUT DST 192.168.10.1 -> 192.168.1.1
on eth0.11, INPUT SRC 192.168.1.1 -> 192.168.11.1
on eth0.11, OUTPUT DST 192.168.11.1 -> 192.168.1.1
...
Try this :
iptables -t nat -A POSTROUTING -j SNAT -i eth0.10 -s 192.168.1.1
--to-source 192.168.10.1
iptables -t nat -A PREROUTING -j DNAT -o eth0.10 -d 192.168.10.1
--to-destination 192.168.1.1
thanks,
Matevz Langus
Swifty
