Firewall rule for RTSP restriction

RouterOS Beginner Basics
1

Hi!

I have a question about firewall rule.

I have IP camera which connects by RTSP to some internet provider server which allows me to connect remotely with mobile phone. It’s quite convinient but actually I perefer to restrict internet access for my camera. I’ve made simplest firewall rule for specific internal IP at the end of rule list:

chain=forward src-address=192.168.88.203 action=drop

It works but only for new connection attempts. I mean applying of firewall rule does not remove established camera connections at the same moment. If camera has already established connection then I have to wait for some time befor camera lose it. Is there some way to drop all rtsp traffic immediately after applying firewall rule?

2

Remove the established connection records from conntrack table.
Or put such rule into raw table.

3

I like prerouting raw table solution and it works. Thank you!