Re: setup second nic on debian/powerpc not succeeding

From: Brian Brazil (bbrazil_at_netsoc.tcd.ie)
Date: 02/27/04

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    Date: Fri, 27 Feb 2004 12:38:33 +0000
To: debian-user@lists.debian.org

    On Fri, Feb 27, 2004 at 12:59:12PM +0100, Joost De *** wrote:
    > On Friday 27 February 2004 12:58, Brian Brazil shoved this is my mailbox:
                                                                 ^^ Hmmmm...
    > > On Thu, Feb 26, 2004 at 10:25:52PM +0100, Joey Macao wrote:
    > ...
    > > > eth0 Link encap:Ethernet HWaddr 00:05:02:C9:BA:CC
    > > > inet addr:192.168.1.3 Bcast:192.168.0.255 Mask:255.255.255.0
    > > > eth1 Link encap:Ethernet HWaddr 00:50:BA:B3:1D:31
    > > > inet addr:192.168.1.8 Bcast:192.168.0.255 Mask:255.255.255.0
    > ...
    > > > however pinging to 192.168.1.8 gives me: "Destination Host Unreachable"
    > >
    > > This is a routing issue. Could you do a 'route -n' and post the results?
    > ..
    > > Also just noticed your broadcast address is wrong. Should be
    > > 192.168.1.255 for that subnet/netmask.
    >
    > Brian is right, your broadcast address is incorrect, so probably the ARP
    > request never reaches the other network card.

    My understanding is that ARP request goes out on
    FF:FF:FF:FF:FF:FF thereby staying on the link layer (ignoring the fact
    that its getting IP information). See output of 'arp'

    Also the packet should never leave the box - it should be handled
    entirely via the INPUT and OUTPUT iptables chains(if you were using
    iptables).

    Now if you were to send out an 192.168.{1,0}.255 broadcast on that network
    from another system there's a good chance you'll cause a broadcast storm
    - especially if any of the machines are set up to forward packets.
    I've never seen one of these beasts though.

    My reference is O'Reillys NIS & NFS - there's a lot of detail in there
    but I read it a good while back though.

    Brian 

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