On eth0 - no. My "fudged" MAC Address is based on the IP Address. So
1.2.3.50 becomes 001.002.003.050, which turns into 00:10:02:00:30:50.
But 1.2.3 is fake - it isn't the one I really use. The other one,
172.16.16.3 - that is a real IP Address that turns into
17:20:16:01:60:03. And here I thought I was pretty clever - it never
dawned on me in my wildest dreams that those bits had any special
meaning! I will do some homework about what all the bits mean and then
put together another scheme for my fudged IP Addresses and post the
results here.
- Greg
-----Original Message-----
From: Chuck Ebbert [mailto:[email protected]]
Sent: Monday, March 13, 2006 12:11 AM
To: Greg Scott
Cc: linux-kernel; David S. Miller
Subject: Re: Router stops routing after changing MAC Address
In-Reply-To:
<925A849792280C4E80C5461017A4B8A20321CC@mail733.InfraSupportEtc.com>
On Fri, 10 Mar 2006 18:33:15 -0600, Greg Scott wrote:
> How to change MAC addresses is documented well enough - and it works -
> but when I change MAC addresses, my router stops routing. From the
> router, I can see the systems on both sides - but the router just
> refuses to forward packets. Here are my little test scripts to change
> MAC Addresses.
>
> First - ip-fudge-mac.sh
> [root@test-fw2 gregs]# more ip-fudge-mac.sh ip link set eth0 down ip
> link set eth0 address 01:02:03:04:05:06
^
Bit zero is set, so this is a multicast address. Is that intentional?
> ip link set eth0 up
>
> ip link set eth1 down
> ip link set eth1 address 17:20:16:01:60:03
^
Ditto.
> ip link set eth1 up
>
> echo "1" > /proc/sys/net/ipv4/ip_forward
--
Chuck
"Penguins don't come from next door, they come from the Antarctic!"
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