[wplug] one armed router

[Bill Powell]

The first disclaimer:   I am no networking expert. But I just happened to
read something the day before getting this note.

Setting a single network card up to handle two IP address' in this fashion
forces it into a 'promiscuous' mode that can make it vunerable to a number of
security issues.  So you might want to do some research on this before
betting the farm.

Frank Carmickle wrote:

> Yes Linux sure can do this.  You must have ip aliasing turned on in the
> kernel.  Then you can specify something like thisa
>
> ifconfig eth0 62.83.152.155
> ifconfig eth0:0 192.168.1.1
>
> I am not sure exactly what you do with ipchains.  If someone doesn't know
> I will ask a friend of mine.  He is running a configuration like this.
>
> FC
>
> On Fri, 8 Dec 2000, Keith Wolters wrote:
>
> > Can anyone tell me if Linux can be used as a one armed
> > router?  By that I mean that a Linux box would have
> > one thernet card with two (or more) IP addresses
> > associated with the card and when it received a packet
> > for a different network from one one it was sent from
> > it would rewrite it and send it out on the same card
> > it was received on.
> >
> > I'm looking to do this because where I work we use
> > 192.168.0 as our network and I'd like to migrate
> > either to multiple class C networks or to a subnetted
> > class B network but to ease the transition I thought
> > that if we could run two networks over the same wires
> > for some time we could seperate the renumbering task
> > from the rewiring task.
> >
> > Keith
> >
> >
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