Subnets

[Network Administration]

   Date: Sun, 18 Jun 2000 21:57:28 +0200
   From: Martin Mares <mj at ucw.cz>
   Cc: bird-users at atrey.karlin.mff.cuni.cz
   Content-Type: text/plain; charset=us-ascii

   Hello!

   > With a Slackware 7 kernel 2.2.14 system, I notice that the client (or
   > bird) gets the wrong broadcast address.
   > 
   > bird> sh inter
   > lo up (index=1)
   >         MultiAccess AdminUp LinkUp Loopback Ignored MTU=3924
   >         127.0.0.1/8 (Primary, broadcast 127.255.255.255, scope host)
   > eth0 up (index=10)
   >         MultiAccess Broadcast Multicast AdminUp LinkUp MTU=1500
   >         208.135.194.18/30 (Primary, broadcast 208.135.194.255, opposite 208.135.194.19, scope univ)
   > eth1 up (index=11)
   >         MultiAccess Broadcast Multicast AdminUp LinkUp MTU=1500
   >         208.135.194.21/30 (Primary, broadcast 208.135.194.255, opposite 208.135.194.20, scope univ)
   > eth2 up (index=12)
   >         MultiAccess Broadcast Multicast AdminUp LinkUp MTU=1500
   >         208.135.194.28/29 (Primary, broadcast 208.135.194.255, scope univ)
   > eth3 DOWN (index=13)
   >         MultiAccess Broadcast Multicast AdminUp LinkDown MTU=1500

   Are you sure you've set the broadcast address correctly when
   configuring the interface? What do `ifconfig' and `ip addr' print?

Hmm, I thought I checked that before dropping setting the broadcast
address (too many recent IP changes).  I added it back in, but I'm
surprised that the default isn't the last address in the net
(CIDR-wise).