Definitive list of protocols with NAT/conntrack support

[Phil Dempster]

I am trying to compile a list of all protocols currently supported by
netfilter (and those that are work in progress).

As far as I can determine from searching, the following are available as
helper modules:

* FTP
* IRC
* Quake
* H323

I am also assuming that protocols such as telnet will work without a helper
module since they do not contain IP addressing information.

Please feel free to correct my ignorance should any of the above be
incorrect!

Thanks in advance,
Phil.