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rb9999
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Posts: 26
Joined: Thu Dec 06, 2018 3:09 pm

v7.7 rtsp issue on bridged interfaces

Wed Jan 18, 2023 2:01 pm

I have a strange issue with RTSP traffic. The setup is the following. l2tp with ipsec for layer3 vpn (client is behind nat), inside of it eoip tunnel (l2). that eoip tunnel is bridged with ether4 in a separate bridge. When the client is connected to ether4, it obtains an IP (via that l2 tunnel) any pretty much everything works except RTSP traffic.
Now, the odd thing about it is when I start a packet capture on interface ether4, tcp, port 554, everything starts working. When I stop the traffic capture, rtsp is broken again. I assume issues started when rtsp helper was introduced in routeros, although I can't confirm.

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