dhclient and ADSL modem trouble...

[Digital Brain]

Hi!

I'm setting up a gateway server on FreeBSD 5.3-RELEASE but I'm having 
problems getting FreeBSD to work with my ADSL modem (provided by ISP, no 
documentation, nothing on the net :-( ).

The problem is I'm trying to get my private IP via "dhclient -v ed0" and all 
I observe is
a series of "DHCPDISCOVER on ed0 to xxxxxx port 67 interval x" and in the 
end a
message saying "No DHCPOFFER received".

I've also used tcpdump to figure out what's going on with dhclient -- all I 
can see is the dhcp requests from my machine and *no* replies whatsoever. As 
if the ISP's DHCP server  never received a request.

The bpf device is included in the kernel config and I don't think it's a NIC 
problem (it works OK when I manually set the IP and ISP gateway). It's also 
not a network cable problem or ADSL modem problem (pls see below).

Linux machines with dhcpcd and other Windows machines I've tried, all work 
OK and receive a private IP from my ISP. While monitoring the dhcp exchange 
with Ethereal, I can see 1 dhcp request and shortly after a dhcp reply with 
an assigned IP.

Is there a problem with the particular version of dhclient in FreeBSD 5.3?

Are there any solutions to this problem (preferably using FBSD-5.3)?

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Thanks in advance.