Cannot get network to work properly on fresh install

I just got myself a new lenovo laptop and naturally wanted to instakll arch on it immediately.
The network I am on requires me to register the MAC address of the machine before I can access anything more than our intranet. Since this is done via a website, that is obviously difficult to do with arch, so I ran a mandriva livecd first to register it.
Quirk number one: I set up a new partition table and installed arch with grub. somehow one of these things actually changed my MAC address because I needed to reregister it and I could tell there it was a new one registered.
However, booting into arch again and I still can't get it to work properly. pinging our intranet address works fine, but I can't get to the www and so cannot install any new packages.
I've installed mandriva on a separate partition and here it all works fine. So the problem seems to be with Arch. My uneducated guess is that it somehow registers as having a different MAC address in arch, which of course creates a bit of a catch-22 because I can't install the packages needed to go to our intranet website and fix it (I should note - once I re-registered my mac address after creating a new partition table, I could complete a net-install of arch. but no internet access having booted into it).
Anyone know how I can fix this?

tuxce wrote:actually, mac address doesn't change from one distribution to another
but you can check your mac address by using "ifconfig"
also verify if dns (/etc/resolv.conf) and route are well defined
resolv.conf has
# Generated by dhcpcd for interface eth0
search rhk.dk
nameserver 172.20.0.42
nameserver 195.184.96.2
rhk.dk is our intranet. I don't know if those numbers mean anything's out of place.

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ThinkPads:- T400[Win 7], T60[Win 7], IBM 240[Win XP]
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