autogenerated ipv6 addresses on vlans

Thu Nov 25 16:09:00 UTC 2010

It seems that on 8-stable the autogenerated ipv6 addresses in vlans use
the mac address of the first interface and not its own mac address. Is
there a reason for this? On 7.x it used the vlan's mac address.

The rc.conf file look like this (ipv4 and other configs removed)
##################################
ipv6_enable="YES"
ipv6_gateway_enable="YES"
ifconfig_ix0="-rxcsum -lro up"
vlans_ix0="101 3101 3103 3199"
ipv6_prefix_ix0_101="2001:1234:5678:ffff"
ifconfig_ix1="-rxcsum -lro"
ifconfig_ix2="-rxcsum -lro up"
vlans_ix2="1 8"
ipv6_prefix_ix2_1="2001:1234:5678:0003"
ipv6_prefix_ix2_8="2001:1234:5678:0001"
##################################

ifconfig with ipv4 and global ipv6 addresses stripped:
##################################
bce0: flags=8802<BROADCAST,SIMPLEX,MULTICAST> metric 0 mtu 1500
	options=c01bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,VLAN_HWTSO,LINKSTATE>
	ether 00:25:64:f9:eb:5d
	inet6 fe80::225:64ff:fef9:eb5d%bce0 prefixlen 64 scopeid 0x1 
	nd6 options=3<PERFORMNUD,ACCEPT_RTADV>
	media: Ethernet autoselect
bce1: flags=8802<BROADCAST,SIMPLEX,MULTICAST> metric 0 mtu 1500
	options=c01bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,VLAN_HWTSO,LINKSTATE>
	ether 00:25:64:f9:eb:5f
	inet6 fe80::225:64ff:fef9:eb5f%bce1 prefixlen 64 scopeid 0x2 
	nd6 options=3<PERFORMNUD,ACCEPT_RTADV>
	media: Ethernet autoselect
bce2: flags=8802<BROADCAST,SIMPLEX,MULTICAST> metric 0 mtu 1500
	options=c01bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,VLAN_HWTSO,LINKSTATE>
	ether 00:25:64:f9:eb:61
	inet6 fe80::225:64ff:fef9:eb61%bce2 prefixlen 64 scopeid 0x3 
	nd6 options=3<PERFORMNUD,ACCEPT_RTADV>
	media: Ethernet autoselect
bce3: flags=8802<BROADCAST,SIMPLEX,MULTICAST> metric 0 mtu 1500
	options=c01bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,VLAN_HWTSO,LINKSTATE>
	ether 00:25:64:f9:eb:63
	inet6 fe80::225:64ff:fef9:eb63%bce3 prefixlen 64 scopeid 0x4 
	nd6 options=3<PERFORMNUD,ACCEPT_RTADV>
	media: Ethernet autoselect
ix0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
	options=1b8<VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4>
	ether 00:1b:21:57:b4:20
	inet6 fe80::21b:21ff:fe57:b420%ix0 prefixlen 64 scopeid 0x5 
	nd6 options=3<PERFORMNUD,ACCEPT_RTADV>
	media: Ethernet autoselect (10Gbase-SR <full-duplex>)
	status: active
ix1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
	options=1b8<VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4>
	ether 00:1b:21:57:b4:21
	inet6 fe80::21b:21ff:fe57:b421%ix1 prefixlen 64 scopeid 0x6 
	nd6 options=3<PERFORMNUD,ACCEPT_RTADV>
	media: Ethernet autoselect (10Gbase-SR <full-duplex>)
	status: active
ix2: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
	options=1a8<VLAN_MTU,JUMBO_MTU,VLAN_HWCSUM,TSO4>
	ether 00:1b:21:57:ef:7c
	inet6 fe80::21b:21ff:fe57:ef7c%ix2 prefixlen 64 scopeid 0x7 
	nd6 options=3<PERFORMNUD,ACCEPT_RTADV>
	media: Ethernet autoselect (10Gbase-SR <full-duplex>)
	status: active
ix3: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
	options=b8<VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM>
	ether 00:1b:21:57:ef:7d
	inet6 fe80::21b:21ff:fe57:ef7d%ix3 prefixlen 64 scopeid 0x8 
	nd6 options=3<PERFORMNUD,ACCEPT_RTADV>
	media: Ethernet autoselect (10Gbase-SR <full-duplex>)
	status: active
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384
	options=3<RXCSUM,TXCSUM>
	inet6 ::1 prefixlen 128 
	inet6 fe80::1%lo0 prefixlen 64 scopeid 0x9 
	nd6 options=3<PERFORMNUD,ACCEPT_RTADV>
ix0.101: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
	ether 00:1b:21:57:b4:20
	inet6 fe80::225:64ff:fef9:eb5d%ix0.101 prefixlen 64 scopeid 0xa 
	nd6 options=3<PERFORMNUD,ACCEPT_RTADV>
	media: Ethernet autoselect (10Gbase-SR <full-duplex>)
	status: active
	vlan: 101 parent interface: ix0
ix0.3101: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
	ether 00:1b:21:57:b4:20
	inet6 fe80::225:64ff:fef9:eb5d%ix0.3101 prefixlen 64 scopeid 0xb 
	nd6 options=3<PERFORMNUD,ACCEPT_RTADV>
	media: Ethernet autoselect (10Gbase-SR <full-duplex>)
	status: active
	vlan: 3101 parent interface: ix0
ix0.3103: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
	ether 00:1b:21:57:b4:20
	inet6 fe80::225:64ff:fef9:eb5d%ix0.3103 prefixlen 64 scopeid 0xc 
	nd6 options=3<PERFORMNUD,ACCEPT_RTADV>
	media: Ethernet autoselect (10Gbase-SR <full-duplex>)
	status: active
	vlan: 3103 parent interface: ix0
ix0.3199: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
	ether 00:1b:21:57:b4:20
	inet6 fe80::225:64ff:fef9:eb5d%ix0.3199 prefixlen 64 scopeid 0xd 
	nd6 options=3<PERFORMNUD,ACCEPT_RTADV>
	media: Ethernet autoselect (10Gbase-SR <full-duplex>)
	status: active
	vlan: 3199 parent interface: ix0
ix2.1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
	ether 00:1b:21:57:ef:7c
	inet6 fe80::225:64ff:fef9:eb5d%ix2.1 prefixlen 64 scopeid 0xe 
	nd6 options=3<PERFORMNUD,ACCEPT_RTADV>
	media: Ethernet autoselect (10Gbase-SR <full-duplex>)
	status: active
	vlan: 1 parent interface: ix2
ix2.8: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
	ether 00:1b:21:57:ef:7c
	inet6 fe80::225:64ff:fef9:eb5d%ix2.8 prefixlen 64 scopeid 0xf 
	nd6 options=3<PERFORMNUD,ACCEPT_RTADV>
	media: Ethernet autoselect (10Gbase-SR <full-duplex>)
	status: active
	vlan: 8 parent interface: ix2
##################################

John
-- 
John Hay -- jhay at meraka.csir.co.za / jhay at FreeBSD.org