For Expert: Allot, OSPF, Vlan, NAT

[Wiyat Spain]

Dear

Cisco Support

My entire network coming working with OSFP without any problem.- Recently we need to make some changes for probe Allot for mamangement the traffic QoS etc.- The point is that, actually we have two type of IP Address, Public and private, where we assigned via PPPoE and under PPPoE we make the NAT.

I need to be centralize the NAT on my core network, the main idea is to put a router-2 next to main router-1, where we will be make the NAT process.

Idea-1:  On router-2 create OSPF and after configure the NAT options.- The cabling can be Allot direct to router-2 and after Router-2 cabling to Router-1 on this way all the traffic will be pass over the Router-2.

Idea-2: Allot will be connect to Router-1, and router-1 will be connect the cabling to router-2

The first idea is that If I have a problem with router-2 all my entire network can be go down.- For this reason I need to be setup this configuration with idea-2

* Allot to R1 and R1 to R2

      OSPF on R2:  for transport the public address that we will be match with the private IP.

Please can you recommend other way for make more easy this changes, please

[Georg Pauwen]

Hello,

which Alllot device do you have ?

And why would you want to add another NAT device ? On your drawing it looks like Router 1 is the Internet edge, so the NAT should be done there...?

[Wiyat Spain]

Dear

Georg

Yes, I can make a NAT on Router1.

1. What is the sentence (cli command) on cisco for make the NAT

2. What is the impact of the new process NAT on BGP/OSPF Router,  more resources of Memory, CPU

Do you have any other idea, about how I can make possible this, to be have a Router-2 exclusive for NAT.

Back router-3, I have 32 PPPoE/Router where I have N customer connected to each one, some customer have public IP Address and the rest has private IP Address.- The idea is to be connected the Allot Between Router1 and Router3 and on Router2 make the NAT