I have static IP on a DSL router and want to access 4 routers on the lan ( ssh or telnet )
For one router, I can do a static NAT but how can I access other 3 routers from Internet.
You can do port forwarding based on the port numbers on the DSL router e.g.
Wan interface IP address port 3000 forward it to Router 1 ip address port 23
Wan interface IP address port 3001 forward it to Router 2 ip address port 23
Wan interface IP address port 3002 forward it to Router 3 ip address port 23
Wan interface IP address port 3003 forward it to Router 4 ip address port 23
so when you telnet wan interface ip address it will forward according to the port numbers where the telnet was received on the DSL router
telnet 188.8.131.52 3000 >> Goes to R1
telnet 184.108.40.206 3001 >> Goes to R2
and So on...
Hope this helps
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