Wireshark · Wireshark-users: Re: [Wireshark-users] openvpn and packet sniffing

[Guy Harris <guy@xxxxxxxxxxxx>]

Bill Fassler wrote:
> Sorry I should have provided a better info.  Anyway I do get a capture 
> and I see only UDP traffic.  I am sure the RTP and SIP traffic is within 
> those packets.

I.e., this is "the packets *are* in the capture but aren't recognized by 
Wireshark as RTP packets" case.

> I thought of a perl script to possibly parse out what I 
> want to see or writing another plugin, that gets to the RTP and then 
> passes it off to the appropriate dissector.

All such a plugin would do is detect RTP traffic and cause it to be 
dissected as RTP; the way to do *that* is to have the RTP dissector do 
that - which is what the "try turning the 'try to decode RTP outside of 
conversations preference for RTP on" suggestion was for.  If a plugin 
could do a better job of detecting RTP traffic than the current RTP 
dissector's heuristic, it shouldn't be done as a plugin dissector, it 
should be done as a change to the RTP dissector.  (If the heuristics are 
strong enough - i.e., they won't identify a lot of non-RTP traffic as 
being RTP - they could be turned on by default.)

> In any event, I don't want 
> to reinvent the wheel and I'm sure someone has already jumped this 
> hurdle.  I will try your "decode as" suggestion.  I think this might let 
> me more easily see what I want although it soudns a little cumbersome.

Why not try the other suggestion?