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Date: Mon, 9 Jul 2001 08:16:15 -0700 (PDT)
From: Mark Blackman <mark.blackman@netscalibur.co.uk>
To: freebsd-gnats-submit@FreeBSD.org
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Subject: bin/28833: ifconfig if0 netmask xxx.xxx.xxx.0 doesn't change the netmask
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>Number:         28833
>Category:       bin
>Synopsis:       ifconfig if0 netmask xxx.xxx.xxx.0 doesn't change the netmask
>Confidential:   no
>Severity:       serious
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Jul 09 08:20:01 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:     Mark Blackman
>Release:        4.3-STABLE
>Organization:
Netscalibur UK
>Environment:
System: FreeBSD amoeba.ch.dircon.net 4.3-STABLE FreeBSD 4.3-STABLE #1: Thu May 24 13:03:35 BST 2001 root@admi
n4.dircon.net:/usr/obj/usr/src/sys/AMOEBA i386
>Description:
"ifconfig ep0 netmask 255.255.240.0" has no effect on the netmask for ep0

This did work in FreeBSD-4.2 RELEASE. I suspect this is connnected with ifconfig changes, but I couldn't track it down. It looked like it shouldn't work in 4.2 either, but it does. 

The get_inaddr function seems not to do anything with which==MASK
        (http://www.freebsd.org/cgi/cvsweb.cgi/src/sbin/ifconfig/ifconfig.c?rev=1.51.2.6&content-type=text/x-
cvsweb-markup)


>How-To-Repeat:
 see description
>Fix:
only way to change netmask is via address setting as well

fconfig ep0 inet 10.0.0.1 netmask 255.255.240.0 

then you lose your default route.
>Release-Note:
>Audit-Trail:
>Unformatted:

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