Re: Help Broadcasting a UDP packet on the LAN:URGENT

From: Barney Wolff (barney_at_databus.com)
Date: 10/21/03

  • Next message: Tobias P. Santos: "Remote Boot" 
    Date: Mon, 20 Oct 2003 20:42:50 -0400
To: Wes Peters <wes@softweyr.com>

    On Mon, Oct 20, 2003 at 03:21:26PM -0700, Wes Peters wrote:
    >
    > But does it send the packet to all attached interfaces on a multi-homed
    > host? This is the type of bug that has typically bitten such hackish
    > solutions in the past. One real solution is worth much more than the
    > sum of the sort-of but not really working hacks we have flying about
    > now.

    Bughood is in the eye of the beholder. RFC1122 has this to say, in
    section 3.3.6: (255.255.255.255 is the "Limited Broadcast" address)

                   There has been discussion on whether a datagram addressed
                   to the Limited Broadcast address ought to be sent from all
                   the interfaces of a multihomed host. This specification
                   takes no stand on the issue.
                                                                                    
    And of course any application that actually needs to send such a packet
    on every interface can loop through the interfaces, using the technique
    on each one, getting the reply, removing the 255.0.0.0/8 alias, and
    moving on to the next interface. If it were up to me (as of course it
    is not) I'd leave it at that and not clutter up the kernel. 

    -- 
Barney Wolff         http://www.databus.com/bwresume.pdf
I'm available by contract or FT, in the NYC metro area or via the 'Net.
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