Thank you for the advice.
That is good to know; I now only have a single tcp core input.
The ports are still giving me jip though. I'm staying away from the 6XXX range completely as I read that some ISPs (I am with Virgin) often block all of those. I tried in the 12XXX range as well. Then I had a go with 444 (as I knew 443 was working for my remote HTTPS access), but still no joy with the http://canyouseeme.org/
Is forwarding a given port for torrents exactly the same process as forwarding the 443 port for HTTPS access? if I can get 443 working, I should be able to get any other port working right?
On the Netgear router, is 192.168.1.3 the correct IP to use when port forwarding? This is the IP of eth0 on the core.