Site-to-Site VPN using two different source IP addresses on the same router

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Aug 26th, 2007
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We have a router which is configured with few site-to-site VPN tunnels.

Recently we have got new IP block and wish to use it for the tunnel establishment.

Is it possible to achieve this on the same router. That is, can I use two different IP addresses on the same router to establish the tunnel.

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sathyahemanth Mon, 08/27/2007 - 02:46
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Yes, this is very much possible. While configuring the VPN you need to specify the interface to which the tunnel belong to and the peer ip address. You have to select the respective interface for the IPSEC traffic to flow.



mastram4u Mon, 08/27/2007 - 03:11
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How do I specify that?

Please note that I am creating a IPSec Tunnel with a crypto map applied on the outgoing interface.

sathyahemanth Mon, 08/27/2007 - 03:28
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In your case the outgoing interface will the interface on which the second ISP link was terminated.


mastram4u Mon, 08/27/2007 - 04:20
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The tunnel is not being established from the same router as the one where the ISP link is terminated.

That router is different than the VPN router. There is only one interface which interacts with the Internet router.


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