a Different ip shown in a network

My local area network is not working proerly.  My local ip range is start from 192.168.0.1 to 192.168.0.254
but some time when i am ping any computer in the local area network its ping to the different ip address 209.62.72.173.  I can't understand the problem is this is dns attack or any spyware issue.  I am using ISA server 2006 for the internet sharing.  When i put a ip address of the ISA server as a gateway for the client side means computer this ip will automatically generate.  I remove a gateway from the ip address list its working fine.  Please tell me a solution
Arnaw1Asked:
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leegclystvaleConnect With a Mentor Commented:
Firstly, have you checked the ISA and DNS settings That I suggested?
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leegclystvaleCommented:
You need to check where ISA is getting it's DNS info from. It may well be getting it's adresses from an external DNS server if it doesn't know where to look internally. The default gateway should be your router interface. Any other DNS requests should be from a DNS server internally. Check your DNS entries in your DNS server and also flush the DNS on the machines you are using
tpye start>cmd>type ipconfig /flushDNS
Your DNS server should have a forwarding address, usually your ISP, for DNS entries it can't resolve internally.
Is the ISa server a DNS server?
Let me know how you get on checking the above
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RanjithskCommented:
Can you please post a screenshot of the ping output and a Hijackthis log?
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Keith AlabasterEnterprise ArchitectCommented:
A couple of things here. First you are not quite quite correct. Your network is 192.168.0.0 - 192.168.0.255 as you MUST inluce the network ID and broadcast address. You must also include these two addresses in the internal LAT table (ISA gui - configuration - networks - internal - addresses).

If you do a tracert to the internal IP address, where does the route go? Can you post the output?
Are you using ISA as proxy only or as a proxy firewall?

If it is a proxy/firewall, it is likely that you have the networks bound in the wrong order - you MUST have the internal as the first network card in an ISA configuration.

Keith
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Arnaw1Author Commented:
Pl;ease check the hijackthis log & give me solution.  
hijackthis.log
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