Should port forwarding for running bitcoin be done also on the ISP's router?

Should port forwarding for running bitcoin be done also on the ISP's router?

Follow up question on What is the NAT traversal technique used by bitcoin.

The network architecture described here http://ift.tt/2ygtBiR is something that I (probably) have in my home (and probably 99% of other people):

Internet > ISP router (NAT 1) > My router (NAT 2) > My Node

So my Node is hidden behind 2 NATs. Therefore I should forward ports on both routers to allow incoming connections to my Node.

But people have no access to NAT 1 and can only port-forward NAT 2, and must probably contact ISP to port-forward NAT 1.

How do people run their nodes with incoming connections enabled when this issue is present?

http://ift.tt/2lsiBc1

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