Trace of gen_udp:send/4?

[Lucas Robsahm]

Hi!

I'm trying to use erlang-dhcp-server
(http://code.google.com/p/erlang-dhcp-server/) and got a problem with
gen_udp:send/4.

When i try to send the dhcp offer gen_udp tells me everything is ok but
I get nothing in Wireshark, so nothing is actually sent over the
network.
Is it possible to trace what happens in and after gen_udp:send in
Erlang? In linux? (Ubuntu) 

//Lucas