[Guy Harris <guy@xxxxxxxxxx>]

> 1) Is there a method to re-initialize a dissector ?

Yes.

Create a routine that takes no arguments and returns no errors, e.g. 
"static void socks_reinit(void)", and, in the register routine for the
dissector, do

	register_init_routine(&socks_reinit);

That routine will be called when a new capture is opened (either as a
file to be read, or as a live capture file).