Video RTP stream over VPN client, dropped frames/fragmentation
We have a streaming video server (Genetec Omnicast) and it works fine over the LAN. However, when connecting over VPN to view video remotely, the video is practically unusable.
If running Wireshark to capture the stream, it shows over 50% packet drops with "wrong sequence number" errors or "incorrect time stamp" errors.
If we ping the remote router's inside interface with packets above 1276 bytes it wants to fragment. So I'm assuming the video server is sending 1500 byte packets and for whatever reason these cannot easily be reassembled after fragmentation.
Is there a setting we can set on the router that would alleviate this problem? 1276 bytes seem quite small for MTU but we haven't set it anywhere manually. If we don't clear the DF bit, then we just see a lot of dropped packets.
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