From mboxrd@z Thu Jan  1 00:00:00 1970
From: Alexandru Dragoi <alex@zoomnet.ro>
Subject: Re: Cannot route through an if without ip
Date: Sun, 14 May 2006 13:04:51 +0300
Message-ID: <446700C3.8060407@zoomnet.ro>
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To: "antonio.dibacco" <antonio.dibacco@aruba.it>
Cc: netfilter@lists.netfilter.org

antonio.dibacco wrote:

>
> I have an ethernet (eth1) without any assigned ip, nevertheless I
> would like to route through this IF but issueing the following command
> gives an error:
> route add -net 192.168.1.0 dev eth1
> If the same IF has an address the command will be correctly executed.
> Why?
>
You can't do that. If you know the mac of the other router, do domething
like:

#ip ro add 172.20.20.20/32 dev eth1 scope link
#arp -s 172.20.20.20 <mac>
#ip ro add 192.168.1.0/24 via 172.20.20.20.20

So .. this just show why you can't just route throught an ethernet
device, unless you "want" to do some multicast flood.