First. Thank you very much answering my question.
Let me clarify some background about this MAC-address case.
We have many different IP-subnets at same side of router.
Please don't ask me why, it's too long story to tell here :-)
Some of traffic which goes to router and back is targeted at
layer-2 to this 00:00:00:00:00:01 ethernet address. Still Layer-3
destination address vary depending targeted IP-host. Problem is that our
Layer-2 switches pass through these 00:00:00:00:00:01 frames even Layer-3
(IP) hosts are in other parts of our Layer-2 switched network.
Example:
Source: IP-HostA 10.65.10.1/16 -> Destination: IP-HostB 10.100.100.10/16
Packet goes to Default router as it should (10.65.0.1) and leaves from
same router interface to other network.
BUT when it leaves router, MAC-Destination address is sometimes this
strange 00:00:00:00:01. And this is Unicast packet from/to Telnet or POP3
services (for example).
Source and Destination IP-hosts are not same pair ie. they may be
whatever IP-hosts in whatever different subnets.
This problem appears in traffic to any direction in any subnets in any
OS-system type. I think our router is doing something strange, but
because I can't get it's configuration I can't tell you more details from
there at the moment (It's Cisco router).
That's why I'm interested to know something about this MAC-address.
PS. We have also DECnet,IPX and LAT traffic in our network, but these
problem packets are definitely IP traffic.
--
Regards Janne Kettunen
CCNA, CFFE
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