Moving packets from one port to another
Hello James,
please excuse the incomplete mail. Ctrl+Return did not do what I
intended it to do. :
James Allsopp <jamesaallsopp@googlemail.com> wrote:
> Hi,
> I'm trying to route packets from ones from one interface to another,
> without using NAT i.e.
>
> eth0: 192.168.1.31 (connected to rest of world and DHCP server)
> eth1: 192.168.1.32 (connected to other computers.)
>
> The other computers would be on the 192.168.1.0/24 subnet and hopefully
> be able to see all the computers on the subnet.
>
> I presume I'm going to have to make some sort of bridge, with some
> forwarding as with IPtables. It would be nice not to have a static IP on
> the other computers.
>
> Any suggestions, or discussion of the options, would be gratefully received,
> James
There are two ways to do this:
a) The bridge: You add both eth0 and eth1 to a bridge, which then
gets an IP address from the DHCP server and forwards everything on
the ethernet level.
b) The router: For this to work, you need to divide your subnet into
further subnets (or only use specific IPs behind the gateway) in
order to
- set up your external DHCP server/router to tell it that it can
find those IPs behind the gateway.
- set up your gateway to tell it to forward stuff to those computers
via eth1.
If this is done, you need to enable IP forwarding via a sysctl call
on the gateway. Here, the forwarding takes place on the IPv4/6 level.
I would suggest to go by a), which is much simpler. If you need more
help with either of them, please feel free to ask.
Best regards,
Claudius
--
A board is the planck unit of boredom.
http://chubig.net telnet nightfall.org 4242
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