question on VPN and vlan overlap on 2 remote sites.

Unanswered Question
Nov 4th, 2008
User Badges:

ok, so I have 2 cisco 3845.

Site A's public

Site A's private

Site A's host

Site B's public

Site B's private

Site B's host

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.

  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 0 (0 ratings)
pipsadmin Tue, 11/04/2008 - 11:57
User Badges:

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?

pipsadmin Tue, 11/04/2008 - 12:10
User Badges:

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...

Jon Marshall Tue, 11/04/2008 - 12:21
User Badges:
  • Super Blue, 32500 points or more
  • Hall of Fame,

    Founding Member

  • Cisco Designated VIP,

    2017 LAN, WAN


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 -



This Discussion