Date: Tue, 28 Nov 2006 13:32:14 +0300 (MSK) From: Yar Tikhiy <yar@comp.chem.msu.su> To: FreeBSD-gnats-submit@FreeBSD.org Subject: kern/105945: Address can disappear from network interface Message-ID: <200611281032.kASAWEVN086328@jujik.ramtel.ru> Resent-Message-ID: <200611281040.kASAeDtf058397@freefall.freebsd.org>
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>Number: 105945
>Category: kern
>Synopsis: Address can disappear from network interface
>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 28 10:40:12 GMT 2006
>Closed-Date:
>Last-Modified:
>Originator: Yar Tikhiy
>Release: FreeBSD 7.0-CURRENT i386
>Organization:
none
>Environment:
CURRENT and 6-STABLE
>Description:
If a cloned interface is destroyed, recreated, and assigned
an address without a delay, the address will disappear in
a moment. Moreover, a delay not longer than 0.1 sec between
destruction and recreation doesn't seem to affect the issue.
>How-To-Repeat:
dg6# cat lo.sh
ifconfig lo5 destroy
ifconfig lo5 create 127.1.1.$1/24 mtu ${1}00
ifconfig lo5
echo almost there...
echo
sleep 1
ifconfig lo5
echo
dg6# sh lo.sh 100
ifconfig: interface lo5 does not exist
lo5: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 10000
inet 127.1.1.100 netmask 0xffffff00
almost there...
lo5: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 10000
inet 127.1.1.100 netmask 0xffffff00
dg6# sh lo.sh 101
lo5: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 10100
inet 127.1.1.101 netmask 0xffffff00
almost there...
lo5: flags=8048<LOOPBACK,RUNNING,MULTICAST> mtu 10100
dg6# sh lo.sh 102
lo5: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 10200
inet 127.1.1.102 netmask 0xffffff00
almost there...
lo5: flags=8048<LOOPBACK,RUNNING,MULTICAST> mtu 10200
dg6#
As the cookie stored in mtu shows, we are not setting parameters
on the dying instance of the interface -- IP just disappears from
the new instance.
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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