How does LinkSys WRT54G v7 support RTSP streaming service?

Hello,
I'm using LinkSys WRT54G v7 and I can see RTSP videos using VLC player from m.youtube.com. Strangely, I cannot play videos if other AP such as DLINK is used instead of LinkSys.
I analyzed the packets and found out that RTSP server(youtube) sends RTP packets to client's ports which are acquired at RTSP SETUP procedures. Then the packets from server cannot reach the client because UDP hole is not punched at the AP.
But, when I use LinkSys, the RTP packets can traverse the NAT.
Here goes my question. Does LinkSys provide the NAT traversal of the RTSP streaming service? Then, why can't I find any feature list about this from the LinkSys product information? Any explanation about this?
Thank you in advance for your help!
Solved!
Go to Solution.

1. None of the NAT helpers in Linksys firmware are documented anywhere.
2. Possibly, they have added a helper for RTP.
3. It could also be that the VLC player forwards the port using UPnP.

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