Date: Wed, 19 Jan 2011 03:44:31 +0100 From: Bernd Walter <ticso@cicely7.cicely.de> To: freebsd-net@freebsd.org Cc: Bernd Walter <ticso@cicely7.cicely.de> Subject: strange netstat -ian output Message-ID: <20110119024431.GC39356@cicely7.cicely.de>
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A given interface is configured:
re0: flags=8a43<UP,BROADCAST,RUNNING,ALLMULTI,SIMPLEX,MULTICAST> metric 0 mtu 1500
options=399b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,TSO4,WOL_UCAST,WOL_MCAST,WOL_MAGIC>
ether 00:01:08:00:79:92
inet 10.1.1.15 netmask 0xffffff00 broadcast 10.1.1.255
inet6 fe80::201:8ff:fe00:7992%re0 prefixlen 64 scopeid 0x1
inet6 2a02:21e0:16e0:2000::103 prefixlen 64
nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
media: Ethernet autoselect (1000baseT <full-duplex>)
status: active
This is one of the blocks for this interface:
re0 1500 2a02:21e0:16e 2a02:21e0:16e0:20 0 - - 1 - -
ff02:1::2 (refs: 1)
ff02:1::d (refs: 1)
ff02:1::202 (refs: 1)
ff02:1::1:ff00:103 (refs: 1)
ff01:1::1 (refs: 1)
ff02:1::2:6214:d648(refs: 1)
ff02:1::1 (refs: 1)
ff02:1::1:ff00:7992(refs: 1)
2a02:21e0:16e seems to be the truncated IP.
The first line has 2a02:21e0:16e0:20 - I assume this should say 2a02:21e0:16e0:2000::103,
but it is truncated as well...
Adding -W won't help on truncation.
- ff02:1::2
is not just truncated - this obviously should be ff02::2.
This '1' is part of every multicst address listed, although they
don't belong there.
By looking at systems with a large number of interfaces I came to the
conclusion that this is the scope ID, but why is it listed as part
of the IP?
- ff02:1::d
beside '1' it's Ok, since I've started pim6dd.
- ff02:1::202
beside '1' it's Ok - according to IANA it's RPC.
- ff02:1::1:ff00:103
also beside '1' it is the solicitated address for
2a02:21e0:16e0:2000::103 so it's otherwise Ok
- ff01:1::1
again '1' - otherwise Ok
- ff02:1::2:6214:d648
What's this?
From watching at the MLD packets I know that it is ff02::2:6214:d648
and that every host has such a beast on each interface, but each
host has different 32bit at the end.
Although the IP says that this would be an IANA assigned address it
is not listed in:
http://www.iana.org/assignments/ipv6-multicast-addresses/ipv6-multicast-addresses.xml
- ff02:1::1
again '1' - otherwise Ok
- ff02:1::1:ff00:7992
again '1', and it seems to be the solicitated address for a stateless
configured address - likely fe80::201:8ff:fe00:7992.
Why is this part of the 2a02:21e0:16e block?
A bit stranger is the part for the link-local address:
re0 1500 fe80:1::201:8 fe80:1::201:8ff:f 0 - - 759 - -
ff02:1::2 (refs: 1)
ff02:1::d (refs: 1)
ff02:1::202 (refs: 1)
ff02:1::1:ff00:103 (refs: 1)
ff01:1::1 (refs: 1)
ff02:1::2:6214:d648(refs: 1)
ff02:1::1 (refs: 1)
ff02:1::1:ff00:7992(refs: 1)
In this case even the IP is not only truncated, it also has the excessive '1'.
Well - it's a scoped address, but it doesn't belong inside the IP.
And similar to the unicast address it has all solicitated addresses
listed.
--
B.Walter <bernd@bwct.de> http://www.bwct.de
Modbus/TCP Ethernet I/O Baugruppen, ARM basierte FreeBSD Rechner uvm.
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