misc/138678: FreeBSD does not assign linklocal address to loopbacks >0

[Christoph Weber-Fahr]

>Number:         138678
>Category:       misc
>Synopsis:       FreeBSD does not assign linklocal address to loopbacks >0
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed Sep 09 20:00:06 UTC 2009
>Closed-Date:
>Last-Modified:
>Originator:     Christoph Weber-Fahr
>Release:        7.2R-p3
>Organization:
Vodafone AG
>Environment:
FreeBSD bbres1.tnd.lab.arcor.de 7.2-RELEASE-p3 FreeBSD 7.2-RELEASE-p3 #0: Wed Sep  9 02:43:39 CEST 2009     root at bbres1.tnd.lab.arcor.de:/usr/obj/usr/src/sys/GENERIC  amd64

>Description:
we create another loopback interface (lo1) via a cloned_interfaces list and add it to the ipv6_interfaces list. Then we assign it an address.

After reboot the system comes up and lo1 does not have a loopback address:

bbres1# (~) ifconfig -a
[...]
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384
        inet6 ::1 prefixlen 128
        inet6 fe80::1%lo0 prefixlen 64 scopeid 0x4
        inet 127.0.0.1 netmask 0xff000000
lo1: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384
        inet6 2a00:ff:cfff:530::1:1 prefixlen 128

This is a problem because route6d refuses to run when it finds a v6 interface without linklocal address.


>How-To-Repeat:
see above
>Fix:
Workaround: explicitly configure the linklocal address via rc.conf:

ipv6_ifconfig_lo1_alias0="fe80::1/64"



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