misc/120060: routed deletes link-level routes in the presence of a /32 alias

[Nathan Whitehorn]

>Number:         120060
>Category:       misc
>Synopsis:       routed deletes link-level routes in the presence of a /32 alias
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sun Jan 27 21:10:03 UTC 2008
>Closed-Date:
>Last-Modified:
>Originator:     Nathan Whitehorn
>Release:        7.0-PRERELEASE
>Organization:
University of Chicago
>Environment:
FreeBSD banshee.munuc.org 7.0-PRERELEASE FreeBSD 7.0-PRERELEASE #2: Sun Jan 27 14:06:09 CST 2008     root at banshee.munuc.org:/usr/obj/usr/src/sys/X2100  amd64
>Description:
If any interface on the system has a /32 alias (even if it is marked passive in /etc/gateways), routed will decide to delete all the link-level routes on that interface. For example, if interface bge0 has IP addresses 128.135.214.56/24 and 128.135.214.58/32, then the 128.135.214.0/24 link-level route will be deleted, leaving the machine unable to communicate with anything out of the that interface.
>How-To-Repeat:
Set up a /32 alias in the same subnet as the main IP address, then turn on routed.
>Fix:
Set the alias's netmask to /24.

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