cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
355
Views
0
Helpful
4
Replies

question on VPN and vlan overlap on 2 remote sites.

pipsadmin
Level 1
Level 1

ok, so I have 2 cisco 3845.

Site A's public 216.24.230.2

Site A's private 10.10.10.0/24

Site A's host 10.10.10.200

Site B's public 216.24.238.40

Site B's private 10.10.10.0/24

Site B's host 10.10.10.100

Both sites have the same internal IP schema.

How can I make a VPN between the 2 sites, so that host in site a has full access to host on site B.

As you can see, i'm very newbie when it comes to VPN's.

Thanks in advance.

4 Replies 4

Jon Marshall
Hall of Fame
Hall of Fame

Nelson

Start with this document and come back if you have further questions -

http://www.cisco.com/en/US/tech/tk583/tk372/technologies_configuration_example09186a00800b07ed.shtml

Jon

but this is for same IP addresses on both sides... I don't have that issue. I simply want the VPN to pass traffic like if it was a bridge to the other site.

So that when I ping from site A to site B's host, it looks like it's local.

Is this at all possible?

is there a way to basicaly use the VPN to extend the broadcast domain to the other site? I dont have conflicting IP address, but I also cannot do NAT because of the applications being used and sone other dependencies...

Nelson

Apologies for misunderstanding, you made it sound like an overlapping subnet issue.

L2TPv3 will allow you to extend a vlan across a L3 routed link but i think this is more complicated than just using the example i previously supplied -

http://www.cisco.com/en/US/docs/ios/12_3t/12_3t2/feature/guide/gtl2tpv3.html

Jon

Getting Started

Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community:

Innovations in Cisco Full Stack Observability - A new webinar from Cisco