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Cisco 3000 concentrator with private IP

Posted on 2007-12-06
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Last Modified: 2013-11-16
Hello Experts,
I have a network with one public IP address assigned to a watchgaurd firebox x500 firewall.  I need to install a cisco 3000 concentrator behind this firewall.  The lan port on the cisco already has an internal address 192.168.0.249  ...  what ip do i assign the public port?  The firebox is providing NAT so, I am not sure if I can give the cisco public ip a private (192.168.0.248) address.

Also, how do i tell the firebox that all vpn traffic should be forwarded to the this cisco...

Thanks!

derek
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Question by:corpdsinc
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by:batry_boy
ID: 20424679
Can't help you with the firebox configuration, but you most certainly can assign a private IP address to the public interface of the VPN 3000 concentrator.  I would then do a one-to-one NAT on the firebox from that private IP on the public interface of the concentrator to a public IP address that you own and then configure the following ports to be allowed through the firewall to the concentrator:

UDP 500
UDP 4500
TCP 10000 (optional, only if you're using IPSEC over TCP)

Good luck!
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by:corpdsinc
ID: 20425698
Thanks for the help.  I tired that with now luck.  I forwarded all of those ports to the internet address of the public interface ...and did a one to one nat from a public ip to the interal (cisco exteral) address..but it still will not connect.   I am running out of ideas.  
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by:corpdsinc
ID: 20453657
I think I would prefer to assign my cisco concentrator an IP from my public block rather than do the port forwarding...but I don't know how to this with a watchguard. I have opened a question in that area.

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batry_boy earned 500 total points
ID: 20457475
That would be the easiest way to do this.  Adding in that port forwarding layer in your topology complicates the implementation.  BTW, the concentrator is considered a hardened device (like a firewall) so you should feel comfortable putting the VPN concentrator right beside the watchguard if you want to.  This is the typical placement of a concentrator in a network topology, although I have put some in behind a PIX before.  The concentrator is considered a hardened device because you can't allow traffic inbound through it unless it is a tunneling protocol (IPSEC, L2TP) so the only way to get traffic to go through it in an inbound fashion is to first establish a VPN tunnel to it...you can't open it up to just regular unencrypted traffic like you can on a firewall.
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