all [0s|1]'s subnets

In message <> you wri

Both FreeBSD and BSDI appear to choke on those two addresses.

My FreeBSD box does not choke on either address; tcpdump shows it sending
packets destined for both addresses to my router, which then fails to respond.


My apologies for the sloppy research. :frowning: I should have checked.

Ok, so the question switches to why doesn't the router respond? Like I
said before, this router has ip classless enabled (and ip subnet-zero). It
has a default route over one of the serial interfaces.