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Cisco Router behind 3G Modem

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by alsolaih

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Hi;

We want to connect a branch to the HQ, in HQ we've DSL connection use Cisco Router 887, in the branch we've not DSL availability, so we bought a 3G Modem (by SIM Card) to get Internet.
the question: Is it available to connect the 3G modem with a new Cisco router in the branch and make a VPN with the HQ?
Cisco Router(Branch)----3G Modem----[[Internet]]---------Cisco Router(HQ)

Please help.

5 replies

by alsolaih

thanks for reply.

It's a router like speedtouch or linksys, and we've already bought it.
is there away to work with that.

by robo_dev

To put a router-behind-a-router, means doing double NAT, and a IPSEC VPN will not work over a double-natted connection. Plus then there are issues with setting up firewall rules, port forwarding and even practical issues like getting onto the correct network to get to the management interface of each router.

Some routers have a VPN-passthru mode, which does allow IPSEC to work by basically bypassing the NAT firewall, however, then you would need to configure both the Speedtouch/Linksys AND the Cisco routers to setup the VPN connection.....wayyyy too complicated.

But overall, if you have a new Cisco router in the branch office, simply buying a proper 3G interface for that router, or getting a Cisco router with a 3G interface already included. Even if that costs a lot more, it will be 100% more reliable, faster, and much simpler to configure and support.

by alsolaih

Thanks a lot, I'll inform you with the update.

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