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VPN via ISDN

Posted on 2004-08-18
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Last Modified: 2012-05-05
Hello.  I'm trying to setup a VPN solution for an outfit that has no dsl or T1 access.  they have only ISDN.  they are using a netgear ISDN modem that does not support VPN passthrough.  I'm wanting to find out if there is an ISDN modem/router that has VPN/IPSEC built in.  If not, what is the best way to accomplish this?  they will be connecting to another location that has DSL and a dlink dsl/vpn router using IPSEC with DES encryption.  i've not found an isdn modem/router that will support this.  basically, what is the best way to setup a VPN to this location that has only ISDN?
thanks in advance! :)
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Question by:linuxman25
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by:grblades
ID: 11834424
Hi linuxman25,
There are lots of Cisco routers with ISDN interfaces. How about one of the 800 series?
http://www.cisco.com/en/US/products/hw/routers/ps380/products_data_sheet09186a008008872c.html
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by:linuxman25
ID: 11834803
I checked that out.  looks nice but there is only one public ip address that they have.  this device needs to be able to offer internet access through the LAN port with a private ip address like 192.168.10.x and dish out ip addresses to the other systems.  I suppose it could do this with NAT?
i've read where NAT and ipsec don't work well together on the cisco routers.
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grblades earned 500 total points
ID: 11834889
Have a look at this configuration guide:-
http://www.cisco.com/en/US/products/hw/vpndevc/ps2030/products_configuration_example09186a0080094498.shtml
The example is between a router running NAT and IPSEC VPN to a Cisco PIX. The router configuration should be almost identical going to the dlink.
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