I want to run a vnc repeater service on my home ddwrt router. Due to the possibility of friends/family asking for support in unknown network environments, I'd like the host-repeater application to run on 443 (very rarely blocked), so I'm thinking I can just apply this ip tables rule.
iptables -I INPUT -p tcp -m tcp --dport 443 -j logaccept
I am concerned though, will this mess with traffic in response to outbound traffic? For example, say I connect to my bank account on https. Will the return packets I'm searching for just get directed to my router instead of my computer? I was never sure, because while it's in response to a request, it's still technically INBOUND traffic.
Additionally, I'm aware this would open me to port scans, but since I would not be running the expected protocol on 443, would I be (relatively) safe to open 443 to the rest of the world? I can't imagine someone just randomly guessing I'd be running a specific uvnc repeater AND knowing how to exploit any weakness it may have.
Thank you