OS9 DHCP renew

Yes, you’re completely right. I suspect it’s his home LAN, as I move my powerbook between the same office and my LAN each day and it all works just fine.
It’s really not my responsibility to make sure his home LAN’s DHCP server is behaving itself, but is my job to make his computer work in the office. If I can make it work with a release/renew script, then we don’t have a problem.
So: Who knows how to do it?