VPN issues

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I am no means a networking expert, most of my experience is server
related so forgive me if i ask some dumb networking questions.

I have setup a VPN server on our backup DC in the office with 2 nics.
The internal ip is 10.10.1.11, the vpn ip is 10.10.1.12. I configured
everything according to the several walkthroughs I found online and
everything connects fine from home. The problem I am having is a
strange one. I can connected to/ping only certain pcs from home. I
have not been able to figure any rhyme or reason to why I can or
cannot connect.

So I connect to VPN. I can ping/RDP to Computer A, with a static IP
10.10.1.60, I can ping/RDP to Computer B with a dhcp IP 10.10.1.100. I
cannot ping/RDP to Computer C, with a static IP 10.10.1.71, I cannot
ping/RDP to computer D with dhcp IP 10.10.1.121.

All are workstations running Windows XP Pro. I can ping and RDP to all
computers from within the office. All computers are in the same OU in
AD so they all have the same GPO. My DHCP range is .100-.150 if that
matters. I cannot for the life of me figure out why this is happening.
I have tried from other remote locations besides my house so it is not
just my home network.

If anyone can help me out with what I should check out I would really
appreciate it. Thanks
.

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