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PP2P using Fortigate 50B

Posted on 2011-09-29
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Last Modified: 2012-05-12
Hi Guys,

I am trying to configure a Fortigate 50GB to pass through VPN requests to a Microsoft 2003 RASS server. Any idea on the best way to do this? I am having no luck.
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Question by:Layer3User
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by:jrhelgeson
ID: 36858077
Yes, you need to open up port 1723 TCP, GRE and ICMP
1723 is used to establish the tunnel.
GRE (Generic Route Encapsulation) is a protocol, it is IP protocol 47 that is used to actually tunnel the traffic.
ICMP needs to be opened up - I found that one out the hard way.  Dunno why it needs it but it wouldn't establish the connection without it.

Regards,
JRHelgeson
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by:Layer3User
ID: 36860468
Ah, the ICMP might have got me. I'll try this.
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by:Layer3User
ID: 36900252
Nope, that didn't seem to work.
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by:jrhelgeson
ID: 36901303
I recall that the way I resolved it previously was to set up a packet capture on the device, then open up IP ANY/ANY then capture the traffic.  Then you'll know exactly what protocols are being used to establish the VPN.
It could also be a firewall on the box you are connecting into. Most domain computers will block any IP traffic that originates outside its own subnet.
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