General discussion


VPN with PPPoE

By mtc ·
I want to set up a site to site VPN between 2 offices. I connect through DSL and on both sides I connect with PPPoE, I don't want to apply for static IP addresses, I have checked and it's really expensive.
I was thinking on buying two routers Linksys befsx41.
I have been told that if I don't have static IP addresses and use these routers, I will have to reconfigure the VPN every time the IP changes (so every time I disconnect from internet).
I think it's quite easy, just write the new IP I get, but anyway it's a mess. I would like to know if there is any way to avoid this. I have been told that there are more expensive routers that keep the VPN tunnel even if the IP's change, but I am not sure how to do this, anyone heard about it?
Is there anyone with a VPN and no static IP addresses?
Any help will be appreciated


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by CG IT In reply to VPN with PPPoE

ah, well with the BEFSX41 End Point routers the 2 routers establish the tunnel with each other and they find each other via the IP address. So when the address changes they lose the tunnel. There isn't a small client program on them that updates the IP address to keep the established tunnel. One way around this is to use a non endpoint router on one end and use Windows RRAS on the other. clients on the end with the router initiate the tunnel to the RRAS server on the other end via DNS name instead of IP address. Then you can use a 3rd party DNS service at the site with the RRAS server. This will make sure that any ip address changes will allow clients to find the RRAS server by DNS name.

I haven't heard of any routers that have Dynamic DNS in them though I haven't looked at what 3COM,Cisco and the others have come out with lately.

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by CG IT In reply to

correction: dynamic ip updating in lieu of Dymanic DNS.

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by CG IT In reply to

If you have a static IP address at the site in which remote users will access, then no you won't have to reestablish anything. The site with the static IP address does the authentication process regardless of who is remotely requesting authentication. If those remote users are authorized, they get access regardless of the method used to connect [provided the site they are connecting to can utilize the method].

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by CG IT In reply to

note: transmitting packets over a medium like DSL/cable is like sending a letter to someone. you need to know what their address is for the letter to get there. If they change the address, then your mail is returned undeliverable. If the IP address changes, the packets sent wont' find whoever your sending the packets to.

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by mtc In reply to VPN with PPPoE

What if I have static IP at one end and PPPoE at the other? Will I still need to reconfigure the VPN every time the PPPoE IP changes?

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