On Nov 3, 2009, at 8:21, JASSAL Aman wrote:
Hello,
The logs display something that I find very disturbing.
In the dhcpdump log, the DHCPDISCOVER message your interface sends an
erroneous MAC address, there is a "01:" that is added in front of the
actual MAC address of your interface. What is sent in the discover
message
is "01:00:..." instead of "00:00:...".
Hi Aman,
Yeah - I should have pointed that out. I tried forcing it to be
correct with
interface "vr1" {
send dhcp-client-identifier 00:00:24:c9:23:c1;
}
to no effect.
http://dl.getdropbox.com/u/25895/dhcp/dhcp-freebsd-2.txt
Then what happens explains itself : the DHCP server will send a
DHCPOFFER
by using the requesting client's MAC address, but since the given MAC
address is wrong, he broadcasts it (which I don't think is the
behaviour
that is expected in normal cases...).
I thought the broadcasts were misguided responses to me, too, at first
-- but looking further I think it's just broadcasting when it's giving
(or not) IPs to other clients. I've no idea why it does that.
I only included one, but in http://dl.getdropbox.com/u/25895/dhcp/dhcp-osx.txt
you can see that on OS X I get the weird replies to
ff:ff:ff:ff:ff:ff, too.
I also noticed that OS X adds two extra options in the request:
OPTION: 57 ( 2) Maximum DHCP message size 1500
OPTION: 51 ( 4) IP address leasetime 7776000 (12w6d)
Just to test how can I make dhclient add those, too?
I think this is also why the client doesn't emit a DHCPREQUEST
(which is
emitted by the client to confirm that it is choosing the proposed
settings
from the server, and implicitly turning down any other offers made by
other servers).
I'll look into it when I get back home (at work right now). If
possible :
could you try to connect your Time Warner cable with another
interface ?
Or the same one as the one you used under Mac OS X (that way we
would see
if we get the same behaviour, regardless of the network interface
chosen)
?
The Soekris box only has vr interfaces; the OS X NIC is in my laptop
so unless I install FreeBSD on there I won't be able to test
that. :-) I did actually try one of the other vr interfaces on the
Soekris box with the same result (they work fine with isc-dhcp running
on another FreeBSD box).
- ask
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