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Message-Id: <201205230203.q4N23pll027410@red.freebsd.org>
Date: Wed, 23 May 2012 02:03:51 GMT
From: Arnaud Lacombe <lacombar@gmail.com>
To: freebsd-gnats-submit@FreeBSD.org
Subject: [regression] Permanent ARP entry not deleted on interface configuration failure
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>Number:         168245
>Category:       kern
>Synopsis:       [arp] [regression] Permanent ARP entry not deleted on interface configuration failure
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-net
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:  
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed May 23 02:10:15 UTC 2012
>Closed-Date:    
>Last-Modified:  Fri Jun 08 05:00:06 UTC 2012
>Originator:     Arnaud Lacombe
>Release:        9.0-RELEASE
>Organization:
n/a
>Environment:
>Description:
Permanent ARP entry not deleted on interface configuration failure. Older FreeBSD (ie. 7.1) does not show this bug.
>How-To-Repeat:
# ifconfig vr0 172.31.0.1
# route delete 172.31.0.1
delete host 172.31.0.1
# route delete 172.31.0.0/16
delete net 172.31.0.0
# route add 172.31.0.1 -iface vr1
add host 172.31.0.1: gateway vr1
# ifconfig vr0 delete 172.31.0.1

At this point, only the route to 172.31.0.1 exist, ARP for 172.31.0.1 has been cleared.

# ifconfig vr0 172.31.0.1
ifconfig: ioctl (SIOCAIFADDR): File exists

The stale route entry cause the configuration to fail, leading to:

# ifconfig vr0
vr0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        options=8280b<RXCSUM,TXCSUM,VLAN_MTU,WOL_UCAST,WOL_MAGIC,LINKSTATE>
        ether 00:00:24:cb:f4:90
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
        media: Ethernet autoselect (100baseTX <full-duplex>)
        status: active

this is expected, however:

# arp -a
[...]
? (172.31.0.1) at 00:00:24:cb:f4:90 on vr0 permanent [ethernet]

This should have been cleared while returning from the configuration path.
>Fix:


>Release-Note:
>Audit-Trail:
Responsible-Changed-From-To: freebsd-bugs->freebsd-net 
Responsible-Changed-By: linimon 
Responsible-Changed-When: Fri Jun 8 04:59:39 UTC 2012 
Responsible-Changed-Why:  

http://www.freebsd.org/cgi/query-pr.cgi?pr=168245 
>Unformatted:
