Default Gateway and DNS settings?

I am preparing a replacement computer (XP PC) for an old dial-up system in a remote market. This PC is will be connected to only one other PC using a cat5 crossover cable. There is no need for Internet Access for these two systems - only that they can see each other.

As I set up this replacement PC's networking parameters, I know its fixed IP address needs to be 192.168.3.18 (and that the other PC's IP address is 192.168.3.17). And, I'm pretty sure the subnet mask is 255.255.255.0. But what would the Default Gateway IP address be? There is no router in this setup; only a dial-up modem.

Related question: Does it matter what DNS IP addresses I enter?

Thanks!
lee88Asked:
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bob_the_builderCommented:
It does not need a Default gateway as both addresses are on the same network subnet.
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lee88Author Commented:
So, are you saying that I should leave those settings blank? (Default Gateway and DNS1, DNS2)
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bob_the_builderCommented:
Yes, take a look at the following for more details:

http://www.howtodothings.com/computers-internet/how-to-connect-2-pcs-directly

Before you send the 2 PC's off, connect them to each other and try to Ping each pc from the other.

Cheers,

Bob...
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lee88Author Commented:
The 2nd PC is in the remote market, so I cannot test.
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