Cannot get machines to recognise the domain controller

I am new to setting up a domin controller and am running into the following issue.  I have active directory setup and designated this server as the domain controller as well as for DNS and DHCP.  I hvae set the NIC card to a static IP address 10.1.75.2 with a default Gateway of 10.1.75.1.  I have a lyncsys router set as a gateway with the ip address as 10.1.75.1.  I have a total of 4 machines pluged into this router.  If I try to ping the router I get a responce but if I try to ping the DC I get "Hardware error".  If I try to ping another machine from the DC I get "Hardware Error".  When I first started to stage these servers I let them get DHCP from  our internal DC and all worked but now that I am trying to separate these machines (not pluged into our internal nework anymore)  I am running into these issues.
duanewdsaAsked:
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Delphineous SilverwingGood Ol' GeekCommented:
Is your subnet mask correctly set?  If you are using a linksys device, then you are probably working with a subnet mask of 255.255.255.0 - where Windows will automatically set a 10.x.x.x IP to a subnet mask of 255.255.0.0 or 255.0.0.0.  Make sure your subnet mask is correct.
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duanewdsaAuthor Commented:
I have set the subnet to 255.255.255.0 on each of the machines I have connected to the switch
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bbaoIT ConsultantCommented:
if all internal computers (PCs and the server) can access the internet but cannot talk to each other, your linksys router has probably been configured in separate channel.

are you using a wireless AP/router?
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JjcampNRCommented:
Did you also remember to disable DHCP on the router since you're using the server for that?  You don't want both devices handing out IP addresses on your network.
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JjcampNRCommented:
Can you also clarify what you mean by "they're not plugged into our internal network anymore"?
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duanewdsaAuthor Commented:
I finally got it to work.  I reset the NIC cards and flushed the DNS on each machine and after a reboot they were able to see each other.  I can now add the rest of the machines to this new domain.  Thanks to everyone for the help.
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bbaoIT ConsultantCommented:
good to know this.

as you have posted your solution, you may ask EE moderators to PAQ this question and get refund. :-)
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