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New Member

point to point connection with same subnet

Iam moving our current network infrastructure from our current building to our new building such that both offices run parallel with each other with the same ip scheme on both locations.M confused what will be the routing scheme such that when ip 192.168.1.10/23 in one office do rdp ping into other office machine with 192.168.1.11/23, it works...And both these 192.168.1.10/23 and 192.168.1.11/23 are servers too mean they have port 80 open and needs to be natted on firewall.

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Accepted Solutions

Re: point to point connection with same subnet

you really don't require to enable MPLS for this. Below is a link which would really give you an idea

http://www.networkworld.com/community/node/26272

There are some other ways to tackle as well. If your device doesn't support L2TPv3, then you can transport your Ethernet frames via DLSW+. Let me know i will explain you a little further (if required).

You can even fix your requirement with NAT on your new office edge router. If you have servers which requires clustering & you have physically seperated them, then this solution will not work. Server clustering happens only when two sees themselves in the same subnet unfortunately. So, make a right choice if you have server clustering between servers physically seperated between offices.

Thanks

Vivek

Hope this helps

7 REPLIES
New Member

Re: point to point connection with same subnet

My idea is

on

Firewall

after nat both 192.168.1.10/23 with 1.1.1.1

And 192.168.1.11/23 with 1.1.1.2

Give following

For 192.168.1.1/23 next hop is 192.168.20.2

On layer 3 switch

For 192.168.1.11/32 next hop should be 10.30.1.2/30

On old building router

For 192.168.1.11/32 next hop should be 172.16.31.2/30

On new building router

For 192.168.1.11/30 next hop should be 10.20.1.1/30

And same concept for reverse path from 192.168.1.11/23 to 192.168.1.12/23

Please correct me if I am wrong somewhere in concept ..Thanks alot

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New Member

Re: point to point connection with same subnet

Help guys

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point to point connection with same subnet

Hi,

You can extend your L2 network over an L3 routed interface using L2TPv3. But using a same IP address at both offices will not work AFAIK unless you NAT on your edge routers at new office as you have only one internet out from your old office. You will have a routing issue.

If your edge equipments support L2TPv3 i would suggest you to extend your L2 network till your new office. You can continue using your same IP schema across both locations.

L2TPv3 would be a best way to solve your requirement subjected to your device support.

Thanks

Vivek

New Member

Re: point to point connection with same subnet

Seems you are correct,does these devices need to be MPLS enabled.

Can you just throw little bit light on l2tpv3 so that I can get idea of ip adressing scheme and next hop?

Thank You

Sent from Cisco Technical Support iPad App

Re: point to point connection with same subnet

you really don't require to enable MPLS for this. Below is a link which would really give you an idea

http://www.networkworld.com/community/node/26272

There are some other ways to tackle as well. If your device doesn't support L2TPv3, then you can transport your Ethernet frames via DLSW+. Let me know i will explain you a little further (if required).

You can even fix your requirement with NAT on your new office edge router. If you have servers which requires clustering & you have physically seperated them, then this solution will not work. Server clustering happens only when two sees themselves in the same subnet unfortunately. So, make a right choice if you have server clustering between servers physically seperated between offices.

Thanks

Vivek

Hope this helps

New Member

Re: point to point connection with same subnet

Thanks Vivek...Thanks for directing me in right direction.Can you give a similar link about dslw...

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New Member

Re: point to point connection with same subnet

Hi I have two very important questions?..

Can we make layer 2 VPN across the Internet with help of L2TPv3 just as we make IPSEC VPN?Which devices will support L2TPv3?

I am still confused how L2TP is different from IPSEC?

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