several customers behind peripheral pptp firewall/nat at vpn3015

Hello

I'll try the following:

Win2K PC behind a modem to Lan 3com (making the nat) try to make a pptp connection to our vpn concentrator. A customer will always be to establish contact, but future clients will fail. The vpn concentrator has the following message is displayed:

815 10/21/2002 19:55:49.870 SEV = 4 RPT PPTP/33 = 20 x.x.x.x

Tunnel PPTP for peer x.x.x.x refused - already put in place

We also tried another site that is behind a firewall, and the same thing happens.

Such an arrangement is possible support 3015 vpn concentrator using?

Will this work if I use the client ipsec (cisco or win2k)?

Thank you

Norman

I suspect that you really have an environment PAT (Port Address Translation, or more within a single address on the outside). If this is the case, PPTP will fail because it uses GRE, which is IP (Protocol 47, I think) as well as TCP port 1723. Since GRE is not a port associated with this such as TCP or UDP, most implementations fail completely or, as in your case, allow only one simultaneous connection.

If you go to IPSec by using the Cisco Unity client, you can work around this by implementing IPSec over UDP, which will transport over UDP, thus allowing the ports to associate with different connections.

Tags: Cisco Security

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