Frame Relay Private-Global IPs NAT - NAT PT

M1S0

hi what will it be the best option to choose global IPs for the two internal network ?Lets say that I would like to configure Dynamic NAT for one and NAT - PT for other oneThx

networker050184

Not sure exactly what you are asking here. Can you clarify your question?

M1S0

If I have an internal network 172.16.0.0/22 and I want to configure NAT on the Router to translate the private IP addresses to global IP addresses
what will be the range of the global IPs i have to choose ?

networker050184

Depends. You really don't need NAT here on a L2 service like frame relay. If you were going to be NAT'ing on a WAN link to the internet it would usually be a /30 on the WAN link but you may also have a /28 or something routed to you from the provider to use for internal hosts. If you own your own public IP space you can pretty much do whatever you want.

M1S0

Okay then for example the Configuration for frame relay on my interfaces for these two networks 172.16.0.0/22 and 172.16.4.0/22
I know that will be as follows:

interface Serial0/0/0.102 point-to-point
ip address 172.16.4.1 255.255.252.0
frame-relay interface-dlci 102


interface Serial0/0/0.101 point-to-point
ip address 172.16.0.1 255.255.252.0
frame-relay interface-dlci 101

but If I want to add NAT and NAT - PT for one and the other what global IP addresses I have to choose (subnet etc.) ?

networker050184

You can NAT to any address you want. Or are you asking what public IPs to use? That will depend on what your company owns or your provider assigns you.

M1S0

yep I am asking about the public IPs i can use ?

networker050184

In the real world that depends on what your company own or what it has worked out with your service provider. In a lab you can use whatever you want though.

M1S0

just for a lab at the moment