bin/119255: [patch] dhclient removes aliases on PREINIT

[Jaakko Heinonen]

>Number:         119255
>Category:       bin
>Synopsis:       [patch] dhclient removes aliases on PREINIT
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed Jan 02 11:00:01 UTC 2008
>Closed-Date:
>Last-Modified:
>Originator:     Jaakko Heinonen
>Release:        7.0-RC1
>Organization:
>Environment:
FreeBSD x 7.0-RC1 FreeBSD 7.0-RC1 #0: Mon Dec 24 12:18:24 UTC 2007 root at logan.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC  i386

>Description:
dhclient-script removes aliases from the network interface when it does the PREINIT operation. For example if dhclient does EXPIRE -> PREINIT -> ARPSEND -> ARPCHECK -> BOUND cycle the aliases are lost. The bug is also described in this message:  http://lists.freebsd.org/pipermail/freebsd-isp/2007-August/004769.html .

>How-To-Repeat:
1) Configure at least one alias for a DHCP enabled interface

/etc/rc.conf:
ifconfig_rl0="DHCP"
ifconfig_rl0_alias0="inet 10.0.0.103 netmask 255.255.255.0"

2) Wait dhclient to do EXPIRE -> PREINIT -> ARPSEND -> ARPCHECK -> BOUND cycle

3) Aliases are lost from the interface (10.0.0.103 in this example).
>Fix:


Patch attached with submission follows:

--- /sbin/dhclient-script.orig	2007-12-27 22:17:06.000000000 +0200
+++ /sbin/dhclient-script	2007-12-28 01:27:28.000000000 +0200
@@ -284,7 +284,7 @@
 
 PREINIT)
 	delete_old_alias
-	$IFCONFIG $interface inet 0.0.0.0 netmask 0.0.0.0 broadcast 255.255.255.255 up
+	$IFCONFIG $interface inet alias 0.0.0.0 netmask 0.0.0.0 broadcast 255.255.255.255 up
 	;;
 
 ARPCHECK|ARPSEND)


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