Date: Thu, 12 Oct 2006 11:12:05 +0200 (CEST) From: =?ISO-8859-1?Q?Trond_Endrest=F8l?= <Trond.Endrestol@fagskolen.gjovik.no> To: FreeBSD stable <freebsd-stable@freebsd.org> Subject: Creation of IPv6 link-local addresses Message-ID: <20061012105558.X66952@ramstind.fig.ol.no>
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Hi,
Questions regarding IPv6 may not belong here, but I take my chances
anyway.
Subsection 5.3 of RFC 2462 states that:
``A node forms a link-local address whenever an interface becomes
enabled [...]''
One of the events listed in Subsection 5.3 is when:
``The interface becomes enabled by system management after having
been administratively disabled.''
On one of the systems I manage, I use vlan devices cloned from one of
the two physical interfaces.
Here's a slightly edited output from ifconfig:
xl0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
options=9<RXCSUM,VLAN_MTU>
inet6 fe80::250:4ff:fe43:9d15%xl0 prefixlen 64 scopeid 0x1
inet6 2001:XXXX:YYYY:ZZZZ:250:4ff:fe43:9d15 prefixlen 64 autoconf
ether 00:50:04:43:9d:15
media: Ethernet autoselect (100baseTX <full-duplex>)
status: active
dc0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
options=8<VLAN_MTU>
inet6 fe80::204:e2ff:fe39:29c6%dc0 prefixlen 64 scopeid 0x2
ether 00:04:e2:39:29:c6
media: Ethernet autoselect (100baseTX <full-duplex>)
status: active
vlan0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
inet6 fe80::250:4ff:fe43:9d15%vlan0 prefixlen 64 scopeid 0x4
ether 00:04:e2:39:29:c6
media: Ethernet autoselect (100baseTX <full-duplex>)
status: active
vlan: 40 parent interface: dc0
First, the link-local address on the vlan0 interface is based on the
link-layer address of the primary interface, xl0, yet the vlan
interface has the other physical interface, dc0, as its parent
interface.
Second, the link-layer address is not recreated when I do an
``ifconfig vlan0 down'' followed by an ``ifconfig vlan0 up''.
It seems like the IPv6 stack needs some refurbishment.
Can I set additional link-local addresses on the vlan interfaces and
subsequently remove the ``bogus'' link-local addresses without
disturbing or crashing my system?
Trond.
- --
- ----------------------------------------------------------------------
Trond Endrestøl | trond@fagskolen.gjovik.no
Patron of The Art of Computer Programming| FreeBSD 6.1-S & Pine 4.64
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