Pat configuration on Router

[Raimund Schimanovits]

Hello

I need a PAT configuration for 2 networks inside to 2 different global adresses. So how can i make this?

So one internal network should pat to one global adress and the other network to the second global adress.

I only can configure pat to the interface or a global pool. When i take the pool the router would take some kind of global adresses.

pleas help me

Thanks

[Jon Marshall]

You may have just missed this from the configuration you posted but you do not have "ip nat inside" under your fa0/1.1 interface.

Jon

[Raimund Schimanovits]

oh yes i see. But still no NAT.

When i change the NAT to interface it will work. when i change it to pool every NAT translations a deleted.

Hmmm not good

[Jon Marshall]

Your last configuration only has NAT setup for the interface.

Can you just try this -

1) add in NAT for both pools as in your earlier config

2) before trying any connectivity can you make sure you clear all existing translations ie.

"clear ip translations *"

Jon

[Raimund Schimanovits]

Now i found the problem. If i change the pool addresses with start and end ip to the same it will not work.

When i took 2 different Ip´s it is working. I think that it is not possible that the start and end ip can be the same.

Hmmm

[Jon Marshall]

It should be because all the tests I did were with one IP per pool.

Maybe you have hit a bug.

Jon

[Raimund Schimanovits]

I made this but no result. Nat is not possible.  I´m not so good in configure cisco because i`m learning for my CCNA.

Maybe i have a missunderstanding in NAT and PAT.

[Jon Marshall]

I don't think you do have a misunderstanding because the configurations you have tried work fine for me.

I think the issue is with the hardware not your configuration.

Jon

[Jon Marshall]

I don't think this is a NAT issue.

I tested a variety of different ways and it always works.

I have never used one of those switch modules but I think the issue is that they do not have a backplane connection to the router ie. they cannot route between the vlan interfaces and the onboard ports.

I believe some switch modules can but I couldn't find any documentation about it for the 1841.

So what I would suggest is you run a cable from a spare interface on your switch module to the fa0/1 inbuilt Ethernet port, remove the vlan interfaces and then create subinterfaces on the physical interface and try again.

Jon