> "Point-to-Point" links don't have netmasks, don't run L2 address
> resolution issues (e.g., ARP), and don't have broadcast addresses.
> All that they have is a peer IP address. (And, really, that might be
> optional in some implementations.)
Something to point out is that you can in fact change the netmask on a
POINTOPOINT link using ifconfig (whether or not it is meaningful to do so
is a different issue).
Using the original example of accidently setting POINTOPOINT on dnet0:
# ifconfig dnet0 plumb
# ifconfig dnet0 10.0.0.1 255.255.255.0
# ifconfig dnet0
dnet0: flags=200000850<POINTOPOINT,RUNNING,MULTICAST,CoS> mtu 1500
inet 10.0.0.1 --> 255.255.255.0 netmask ff000000
ether 0:c0:ca:13:a4:9e
# ifconfig dnet0 10.0.0.1 netmask 255.255.255.0
# ifconfig dnet0
dnet0: flags=200000850<POINTOPOINT,RUNNING,MULTICAST,CoS> mtu 1500
inet 10.0.0.1 --> 255.255.255.0 netmask ffffff00
ether 0:c0:ca:13:a4:9e
Not that it really means anything, but ifconfig blithely took the original
default netmask of ff000000 and updated it to ffffff00 while keeping the
POINTOPOINT flag.
Cheers,
Steve
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