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ISA 2006 VPN Connection

Posted on 2010-09-06
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Last Modified: 2012-05-10
I've set-up a VPN connection using ISAs wizards and have managed to connect my laptop to the VPN and obtain an IP address via DHCP. I cannot however access any machines on the internal network nor has the DHCP given out the correct default gateway of the internal network, IPCONFIG shows default gateway as 0.0.0.0. Any ideas what could be wrong?
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Question by:EdMacFly
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Author Comment

by:EdMacFly
ID: 33610313
As a further note, the machine that is connecting is a Windows 7 machine. Also, within the ISA Alerts, it appears that the VPN connection has triggered an IP spoofing warning.
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Expert Comment

by:Mohamed Khairy
ID: 33610518
Did you create the firewall policy that enable the communication from VPN network to Internal network?

Also, Go to networking and tell me what is the network rule relation on the VPN network rule.


VPN-Policy.jpg
VPN-NETWork.jpg
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Author Comment

by:EdMacFly
ID: 33610605
Both the rule and policy look the same as your screenshots.
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LVL 7

Expert Comment

by:Mohamed Khairy
ID: 33610737
Ok, make confirm that you can ping the internal network from the localhost.

Also, try to change the DHCP option on the ISA server to be taken from static address range.

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Author Comment

by:EdMacFly
ID: 33610786
I cannot ping from the VPN client. Should I try setting a static address or has that revealed the problem?
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Accepted Solution

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Hisham_Elkouha earned 500 total points
ID: 33610818
try creating a new rule that allow connection from VPN clients and Local host to Internal Network
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Author Comment

by:EdMacFly
ID: 33610952
That's done it! Excellent. After connecting I could ping the ISA box using it's name but I could not ping the DC using it's name nor could I connect to it without using it's IP address. Any idea why that information is not getting through?
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LVL 7

Expert Comment

by:Mohamed Khairy
ID: 33610967
I can see from the previous steps that the error may be in the DHCP, you said that you can successfuly taking an Ip address from the DHCP and the error in the default gateway so we can make one more check on the DHCP options as follow:

Go to the DHCP and open the scope that you were assigned before to the VPN users and check the scope option for router ( optionn 003 ) and make confirm that the correct GW is available.

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Expert Comment

by:Mohamed Khairy
ID: 33610975
Also check the DNS setting on the DHCP scope options.
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Author Comment

by:EdMacFly
ID: 33611013
Right! I've checked those points and everything seems fine. I can now access internal resources so that is good and have also found that I can make an rdp connection to the DC using it's FQDN rather than just it's name which is fine.
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