From owner-freebsd-hackers  Tue Jun 25 11:51:59 1996
Return-Path: owner-hackers
Received: (from root@localhost)
          by freefall.freebsd.org (8.7.5/8.7.3) id LAA28185
          for hackers-outgoing; Tue, 25 Jun 1996 11:51:59 -0700 (PDT)
Received: from godzilla.zeta.org.au (godzilla.zeta.org.au [203.2.228.19])
          by freefall.freebsd.org (8.7.5/8.7.3) with SMTP id LAA28168
          for <freebsd-hackers@freebsd.org>; Tue, 25 Jun 1996 11:51:55 -0700 (PDT)
Received: (from bde@localhost) by godzilla.zeta.org.au (8.6.12/8.6.9) id EAA20563; Wed, 26 Jun 1996 04:51:12 +1000
Date: Wed, 26 Jun 1996 04:51:12 +1000
From: Bruce Evans <bde@zeta.org.au>
Message-Id: <199606251851.EAA20563@godzilla.zeta.org.au>
To: freebsd-hackers@freebsd.org, henrich@crh.cl.msu.edu
Subject: Re: netinet/udp_usrreq.c and udpcksum
Sender: owner-hackers@freebsd.org
X-Loop: FreeBSD.org
Precedence: bulk

>Now I ask, why has udpcksum become static in -current,

Because it is only referenced in one file.

>and how does one go
>about tweaking it now?

The usual ways.  Hack on it in /dev/kmem using a debugger or otherwise,
or use sysctl:

	sysctl -a | grep udpcksum	# to find the name and value
	sysctl net.inet.udp.checksum	# to read the value when its
					# (inconsistent) name is known
	sysctl -w net.inet.udp.checksum=1234	# to write the value

Using sysctl is by far the best method for those variables that sysctl
supports.

Bruce