Unable to ping ip address

Windows 2000 domain
xp clients

why is it that some of the computers on the network i'm not able to ping and others I can.

However all have network access, internet, able to access network drives ect..

We only have 1 subnet

for I added a new computer to the domain... gave it a 192.168.0.18 ip address
Now from my personal computer with a ip address 192.168.0.36  when I ping 192.168.0.18 I get no replies

but

from the new computer with the ip address of 192.168.0.18  when I ping 192.168.0.36  I do get replies?

makes no sense to me that one way I get replies and the other way I dont   both cmoputers have full network acces, can hit router, servers, ect... but I get these weird analomies where I can't hit certain ips on the same subnet

any ideas
WestonGroupAsked:
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Infinity08Commented:
Is there a firewall running on the PC that doesn't respond to pings ? What operating systems are installed on the different machines ?
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WestonGroupAuthor Commented:
no firewall
all computers run windows xp
all computers use windows xp firewall
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Infinity08Commented:
>> no firewall

>> all computers use windows xp firewall

Isn't that a contradiction ?
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WestonGroupAuthor Commented:
No firewall hardware

Just the built in windows xp firewall is turned on... If you consider that a firewall then yes we use a firewall.

Although explain to me how you can close up ports through xp firewall?

I figured it out , thanks anyway
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Infinity08Commented:
>> Although explain to me how you can close up ports through xp firewall?

Well, that's what a firewall does : it blocks ports ...
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Infinity08Commented:
>> I figured it out , thanks anyway

Care to tell us ?
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WestonGroupAuthor Commented:
Like you said some firewall setting?  
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Infinity08Commented:
Ok, sorry ... I misunderstood you - I thought you found a different problem :)
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Fred MarshallPrincipalCommented:
You could get the same problem if the subnet masks combined with the IP addresses were incompatible.  But I suppose they were all 255.255.255.0, yes?
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WestonGroupAuthor Commented:
yup all the same

it was the windows firewall setting.

I needed to allow exemptions and everything worked then

Thanks for the help
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