[TUHS] fork

[Arno Griffioen via TUHS]

On Tue, May 12, 2026 at 10:11:16PM +0200, Folkert van Heusden via TUHS wrote:
> I think it does because else it would not be able to communicate at all I
> think. Maybe the ARP entries are evicted from the cache (on either side) for
> some reason.
> 
> 
> 
> Something else is strange too: I configured the netmask to 255.255.254.0
> (for 192.168.64.0/23) and it sets that to 255.255.255.0.

Not sure 2.11BSD supports CIDR (aka. classless) or if you have to
enable it.

If not then 192.168.x.x will always end up with a /24 (Class C) netmask
and things like 172.x.x.x a /16 (Class B) and 10.x.x.x with a /8 (Class A)

Also such a netmask mismatch between your router/gw and the device will
cause broadcast (and thus ARP) handling issues. Modern devices will
(re)populate their ARP table if they receive a packet from an unknown
device so they learn quicker and things can kinda limp along but in
reality it is b0rken ;)

Older OS'es don't tend to do that and have a more strict handling in
that respect so issues like this pop up sooner there..

							Bye, Arno.