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Problem with my DNS configurations

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Problem with my DNS configurations

rahuman
I have a 2 Servers in my network. 1st is a PDC (Primary Domain Controller) and 2nd is a ISA server.

1st is running Windows 2000 Server.

2nd is running Windows 2003 Server R2 Enterprise. With ISA server 2004 Standard Ed. This is also running DHCP services and DNS server. Also this is not attached to the domain. I have kept it outside the domain as a workgroup.

My Problem is sometimes when I ping to my internal network the usual response is:
C:\Documents and Settings\Administrator>ping proxy

Pinging proxy [192.168.20.3] with 32 bytes of data:

Reply from 192.168.20.3: bytes=32 time<1ms TTL=128
Reply from 192.168.20.3: bytes=32 time<1ms TTL=128
Reply from 192.168.20.3: bytes=32 time=1ms TTL=128
Reply from 192.168.20.3: bytes=32 time<1ms TTL=128

Ping statistics for 192.168.20.3:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 1ms, Average = 0ms

But sometimes I get this:
C:\Documents and Settings\Administrator>ping proxy.xont.lk

Pinging proxy.xont.lk [208.69.32.130] with 32 bytes of data:

Reply from 208.69.32.130: bytes=32 time=291ms TTL=54
Reply from 208.69.32.130: bytes=32 time=290ms TTL=54
Reply from 208.69.32.130: bytes=32 time=290ms TTL=54
Reply from 208.69.32.130: bytes=32 time=289ms TTL=54

Ping statistics for 208.69.32.130:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 289ms, Maximum = 291ms, Average = 290ms

Also some of the other client pcs that are locally connected cannot be accessed. This also occurs on all other network pc. Sometimes it responds like the first. sometimes like the second.

Please help