Subject: Re: COMPAT_42 (was Re: dumping options TCP_COMPAT_42)
To: Rui Paulo <>
From: Thor Lancelot Simon <>
List: tech-kern
Date: 11/12/2006 20:57:43
On Mon, Nov 13, 2006 at 01:38:27AM +0000, Rui Paulo wrote:
> >>I've checked 386BSD source and they don't even add COMPAT_42 to the
> >>GENERICISA config file, so this is dead code for more than a decade.
> >
> >It is still useful with the Vax port -- and, more importantly, because
> >Ultrix just about _is_ 4.2BSD, killing it will have little actual  
> >effect
> >unless you also kill COMPAT_ULTRIX.
> Is Ultrix using UDP packets with 0 cksum ?

Sorry, I misremembered what this option did.

No, not as far as I'm aware.