Date: Sat, 17 Mar 2012 17:22:27 +0100 From: Oliver Lehmann <oliver@FreeBSD.org> To: net@freebsd.org Subject: invalid MAC addresses? Message-ID: <20120317172227.Horde.tDn5QKQd9PdPZLpDyq9bvcA@avocado.salatschuessel.net>
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Hi,
when I update the BIOS of my new AM3+ Mainboard, The
MAC address of my re0 card gets changed from
c8:60:00:60:3b:c6 to ed:0b:00:00:e0:00 With this
change, no communication with any other FreeBSD system
is possible.
When I try to ping another FreeBSD system, all I can see
on the system I ping with tcpdump is:
# tcpdump -i fxp0 -n -vv
tcpdump: listening on fxp0, link-type EN10MB (Ethernet),
capture size 65535 bytes
17:06:50.689424 IP (tos 0x0, ttl 120, id 3004, offset 0,
flags [none], proto ICMP (1), length 84)
10.111.72.186 > 10.111.72.185: ICMP echo request, id
47626, seq 0, length 64
17:06:50.689488 ARP, Ethernet (len 6), IPv4 (len 4),
Request who-has 10.111.72.186 tell
10.111.72.185, length 28
17:06:50.689758 ARP, Ethernet (len 6), IPv4 (len 4),
Reply 10.111.72.186 is-at
ed:0b:00:00:e0:00, length 46
But the MAC address gets not stored in the ARP cache of
the pinged system and now answer is sent back to the
pinging system:
# arp -n 10.111.72.186
? (10.111.72.186) at (incomplete) on fxp0 expired [ethernet]
10.111.72.186 is the system with the changed BIOS/MAC address
from where I issued a ping to 10.111.72.185
Both systems are connected together with a crossover cable.
When I attach the system with the changed MAC adress to a
switch, and issue dhclient command, the system which does
not answered my ping before, hands out an IP adress to this
system (it is my DHCP server)
Then again - ping does not work to any FreeBSD system
attached to this switch. Pinging a Windows system works and
I can even ping my network printer attached to this switch.
So I wonder what is wrong with this MAC Address that FreeBSD
does not like it? :(
Greetings, Oliver
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