Or if your friend just has modem with more than one port, you can just use it as a hub(Downside is that you will lose internet connection.).
Well, you can keep internet connection by configuring more than one ip for network adapter. However windows doesn't really support it and you will have to poke some registries to make it work.
Heres how to do it,
http://news.softpedia.com/news/Both-DHCP-and-Static-IP-addresss-at-the-same-time-47494.shtml
(And if you are using *nix, you can just use ifconfig to add more ips. Its quite easy, just one line in terminal.
#ifconfig eth0:1 192.168.0.15 up , and of course replace ip with your own and device too. :P)







