Work in underground

Hello

I have two sites and two of them have internet access. Now I have to

do tunel between them so that guests with private IP addresses

communicate directly without NAT.

(1) who is the best solution to use (GRE, L2TP, or something else)?

(2) is it possible that I have the same network addresses on both sides

(IE 10.10.0.0/16)?

(3) if I use GRE do I need a single public IP address from my ISP on

interface to the Internet (through tunnel)?

(4) is it possible to use the same connection and IP to my ISP address

and tunnel only private addresses (i.e. 10.10.0.0) to my

remote site? of course all the other IP addresses should be routed to

Internet.

Thank you

Antonio

There are several approaches that you can consider. Probably the simplest is to make GRE tunnels between sites. The ACCORD will allow you to send traffic between sites without the need to translate the addresses. The ACCORD would allow you to run a protocol for routing between sites. A routing protocol would allow you to have addresses in the same range of addresses on the two sites, as long as they do not overlap. By layering, I mean for example to have 10.10.5.0/25 at site 1 and also have the same subnet to site 2. In this case the only solution is to translate the addresses.

The ACCORD would allow sites to communicate but doesn't provide a degree of protection for traffic. Depending on whether you need to protect traffic between sites, you might want to consider IPSec that can provide protection. Until very recently disclosed IPSec would carry only unicast IP traffic which means that you could not run a dynamic routing on IPSec protocol. Very recent permits routing over IPSec protocols. I have not yet had any experience with this new feature, so can't do not advise how it works.

The traditional solution if you want coverage for traffic and want a routing protocol has been to run IPSec with the GRE tunnels. I did a lot of this, and it works pretty well.

Whether it's the GRE, IPSec or IPSec with GRE you will need public IP addresses on the edge of the two sites.

And with any which of these solutions, you can exchange traffic between sites and route other traffic on the Internet.

HTH

Rick

Tags: Cisco Security

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