Subject: Re: COMPAT_42 (was Re: dumping options TCP_COMPAT_42)
To: None <>
From: Rui Paulo <>
List: tech-kern
Date: 11/13/2006 01:38:27
On Nov 13, 2006, at 1:35 AM, Thor Lancelot Simon wrote:

> On Mon, Nov 13, 2006 at 01:01:45AM +0000, Rui Paulo wrote:
>> On Nov 10, 2006, at 11:18 PM, Perry E. Metzger wrote:
>>> I'd like to yank the support for TCP_COMPAT_42 out of our tree -- I
>>> doubt that there is any legitimate user of the option any
>>> longer. 4.2BSD was more than 20 years ago at this point.
>>> Absent any groundswell of supporters for TCP_COMPAT_42 I'll be
>>> removing it from the tree in a couple of days.
>> On a side note, I'm going to remove COMPAT_42 (note, not
>> TCP_COMPAT_42) code if no one objects. It's not on our kernel config
>> files, it's not on options(4).
>> 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 ?

Rui Paulo