bin/128954: ifconfig deletes valid routes

[Steven Hartland]

>Number:         128954
>Category:       bin
>Synopsis:       ifconfig deletes valid routes
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Tue Nov 18 09:50:01 UTC 2008
>Closed-Date:
>Last-Modified:
>Originator:     Steven Hartland
>Release:        7.0
>Organization:
Multiplay
>Environment:
FreeBSD test 7.0-RELEASE FreeBSD 7.0-RELEASE #0: Sun Feb 24 19:59:52 UTC 
2008 root at logan.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC i386
>Description:
When changing the primary IP of an interface it deletes routes associated with that IP even if the IP its changing to is in the same range and hence the routes are all still valid.
>How-To-Repeat:
Change the primary IP of an interface which has an associated route e.g. default route, to an IP in the same subnet.
Check the routing table the route will be gone.

This is a very nasty issue as it can make remote machine inaccessible.

For more information and discussion see the thread:
http://lists.freebsd.org/pipermail/freebsd-stable/2008-November/046620.html

>Fix:


>Release-Note:
>Audit-Trail:
>Unformatted: