*** Answering a msg posted in area BINKD (Binkd mailer).
Hello Tony,
On Friday January 13 2017 10:42, you wrote to Nicholas Boel:
TL> Same on mine, manufacturers dumbing things down too much, because TL> there is a key difference between port forwarding and packet TL> filtering. In port forwarding, the internal host can use a different TL> port to what the public sees. With packet filtering, that's normally TL> not possible, because the router is doing nothing more than accepting TL> or blocking traffic to a specific port on a LAN host. It is not TL> rewriting packets.
Same here. In my cable modem/router IPv4 port forwarding and IPv6 port unblocking are done on the same page in the web interface. There are 9 fields:
Local IP Address Local Start Port Local End port External IP Address External Start Port External End Port Protocol (TCP/IDP/BOTH) Description Enabled (YEs/No)
When creating a new entry I can choose between "Create IPv4", "Create IPv6" and Create MCv6
When selecting IPv4, alle fields are available. When selecting IPv6 or MACv6, the fields for External IP Address, External Start Port and External End Port gray out.
I don't like this way of presenting it. It is indeed dumbing things down and it creates confusion for both the experienced and the dummies. Hé, why can't I enter external addresses and ports for IPv6?
TL> So, when you're using IPv6, an extra constraint is that the host needs TL> to be listening on the same port that the public sees
Indeed, but explain that to a newbie... Considering IPv4 and IPv6 are on the same page named "port forwarding".
TL> (My router only has a single field for the port in IPv6).
Here I can enter a port range, but only one set for IPv6. For IPv4 there is an external and an internal range. (Which must be of equal size of course).
