Win2003 RRAS PPTP VPN Issues

I am in the process of switching my PPTP VPN server for incoming remote
access, from Windows 2000, to Windows 2003. I have everything setup , and I
can log in and see about 50% of the resources on the LAN. My results are
very sporatic, I can ping many machines, and many others I cannot. The LAN
is a flat subnet, and the only router, besides RRAS, is only used for
internet access.

My setup is a Windows 2003 Standard Server with 2 NIC's. I have it setup to
receive traffic on one card, and talk to the internal LAN on the other.

Here are some examples of what I'm getting:

C:\Documents and Settings\keith>ping 192.168.10.19

Pinging 192.168.10.19 with 32 bytes of data:

Reply from 192.168.10.19: bytes=32 time=41ms TTL=128
Reply from 192.168.10.19: bytes=32 time=78ms TTL=128
Reply from 192.168.10.19: bytes=32 time=45ms TTL=128
Reply from 192.168.10.19: bytes=32 time=49ms TTL=128

Ping statistics for 192.168.10.19:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 41ms, Maximum = 78ms, Average = 53ms

C:\Documents and Settings\keith>ping 192.168.10.15

Pinging 192.168.10.15 with 32 bytes of data:

Request timed out.
Reply from 192.168.10.15: bytes=32 time=49ms TTL=127
Reply from 192.168.10.15: bytes=32 time=51ms TTL=127
Reply from 192.168.10.15: bytes=32 time=45ms TTL=127

Ping statistics for 192.168.10.15:
Packets: Sent = 4, Received = 3, Lost = 1 (25% loss),
Approximate round trip times in milli-seconds:
Minimum = 45ms, Maximum = 51ms, Average = 48ms

C:\Documents and Settings\keith>ping 192.168.10.14

Pinging 192.168.10.14 with 32 bytes of data:

Request timed out.
Request timed out.
Request timed out.
Request timed out.

Ping statistics for 192.168.10.14:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),

C:\Documents and Settings\keith>ping 192.168.10.1

Pinging 192.168.10.1 with 32 bytes of data:

Request timed out.
Reply from 192.168.10.1: bytes=32 time=43ms TTL=127
Reply from 192.168.10.1: bytes=32 time=45ms TTL=127
Reply from 192.168.10.1: bytes=32 time=41ms TTL=127

Ping statistics for 192.168.10.1:
Packets: Sent = 4, Received = 3, Lost = 1 (25% loss),
Approximate round trip times in milli-seconds:
Minimum = 41ms, Maximum = 45ms, Average = 43ms

C:\Documents and Settings\keith>ping 192.168.10.4

Pinging 192.168.10.4 with 32 bytes of data:

Request timed out.
Request timed out.
Request timed out.
Request timed out.

Ping statistics for 192.168.10.4:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),

C:\Documents and Settings\keith>ping 192.168.10.95

Pinging 192.168.10.95 with 32 bytes of data:

Reply from 192.168.10.95: bytes=32 time=42ms TTL=127
Request timed out.
Request timed out.
Request timed out.

Ping statistics for 192.168.10.95:
Packets: Sent = 4, Received = 1, Lost = 3 (75% loss),
Approximate round trip times in milli-seconds:
Minimum = 42ms, Maximum = 42ms, Average = 42ms

AS you can see, I can ping 192.168.10.10, but cannot ping 192.168.10.14, but
sometimes onthe machines I cannot ping, I get one response and the rest time
out. I'm not sure at this point how to trouble shoot this, because it is so
intermittent.

Thanks for your help.

--Keith