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VPN L2L

Posted on 2014-12-18
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Last Modified: 2014-12-18
When setting up a vpn site to site tunnel, can I use the loopback interface as my interface to connect to the peer? All my interfaces are taken. If not, what other options do I have?
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Question by:Shark Attack
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by:rharland2009
ID: 40507346
On most routers/firewalls, you can connect more than one tunnel to a single interface. For example, you might have three remote sites that connect via IPSEC VPN tunnels - and each of those will connect to the WAN interface on your device. If your loopback IP is public, then there's nothing that specifically precludes you from using that, but it depends on the type of router/firewall you're using.
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by:Shark Attack
ID: 40507355
right, but the issue is, there needs to be a specific IP address coming from that routers interface not the one currently there and I cannot change the IP on that interface because it goes to other tunnels
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by:rharland2009
ID: 40507359
Okay, so this particular P2P tunnel needs a specific IP address on your end, which is not the currently assigned address on your WAN interface. You want to know if you can assign this particular address to your loopback and create the tunnel with that.
Is this a Cisco router?
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by:Shark Attack
ID: 40507429
yep, 2811
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rharland2009 earned 500 total points
ID: 40507665
In that case, you should be able to configure your tunnel using the loopback without issue. As long as it's reachable from the device at the other end of the tunnel, you're good.
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