| 1 |
Am Tue, 28 Mar 2017 21:26:05 +0200 |
| 2 |
schrieb Dan Johansson <Dan.Johansson@×××.nu>: |
| 3 |
|
| 4 |
> Slight Off-topic, but at least the host are Gentoo. |
| 5 |
> |
| 6 |
> Is it possible, using iptables or something equivalent, to redirect |
| 7 |
> traffic to some specific TCP ports to another gateway than the |
| 8 |
> default-gateway? |
| 9 |
> |
| 10 |
> Eg. |
| 11 |
> |
| 12 |
> Host 192.168.1.100/24 has a default-gateway of 192.168.1.1 |
| 13 |
> Now I want to send all traffic from this host to destination-tcp-port |
| 14 |
> 80 to gateway 192.168.2.1 instead (the host has a second interface |
| 15 |
> with the address 192.168.2.100/24 as well). |
| 16 |
> I only want the traffic to port 80 to go thru this GW (and then to |
| 17 |
> its final destination). |
| 18 |
> And port 80 is just an example, it could be port 12345 as well. |
| 19 |
> |
| 20 |
> Is this possible? If yes, any suggestion on how to do it? |
| 21 |
|
| 22 |
If I understand you correctly, you want to do the redirect decision on |
| 23 |
the source machine 192.168.1.100, and not on the default gateway |
| 24 |
192.168.1.1. |
| 25 |
|
| 26 |
This means you need to mark packages with iptables, and then doing the |
| 27 |
routing based on the mark. For this, you need to setup policy routing. |
| 28 |
Look here: |
| 29 |
|
| 30 |
http://www.tldp.org/HOWTO/Adv-Routing-HOWTO/lartc.netfilter.html |
| 31 |
|
| 32 |
That example uses port 25 instead of 80. It marks packets, and then |
| 33 |
creates a second routing table to use for such marked packets. |
| 34 |
|
| 35 |
-- |
| 36 |
Regards, |
| 37 |
Kai |
| 38 |
|
| 39 |
Replies to list-only preferred. |
Archives