Issue with Win7 PC

We just recieved a shipment of Win 7 PC. While installing them, we noticed that the port the PC were connected to are error disabling... Allowing the port to except 2 MAC allowed the PC to work, but the second MAC happens to be the Routers MAC address... When this MAC appears on the port we lose connectivity to that network...
axl13Asked:
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axl13Connect With a Mentor Author Commented:
Ended up being a bad PC...
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Sam Simon NasserIT Support ProfessionalCommented:
sorry but i didn't get the question well!

you have a PC with 2 MACs?
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axl13Author Commented:
Yes, the PC has two mac's, the issue is that the 2nd MAC is the ROUTERs MAC and it is acting like the default gateway...
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Sam Simon NasserIT Support ProfessionalCommented:
how come there are 2 macs with the same numbers? impossible!
you can download mac changer and change the 2nd mac to something else
http://www.technitium.com/tmac/index.html
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axl13Author Commented:
Not just one PC, there are few... The ones that show this take the ROUTERS MAC address, witch is the Default Gateway...
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Sam Simon NasserIT Support ProfessionalCommented:
i once faced this issue, normal PC and one mac. our neighours are connected to our router and once we faced internet curruption. found out that they installed 4-port switch that cause this issue (IP issue).

if you have installed any devices lately, in which this problem appears after, remove them and try. you have to remember which date this was working .
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axl13Author Commented:
samnasser,
6?
where you running ipv
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Sam Simon NasserIT Support ProfessionalCommented:
no ... normal pc and normal configuration ... the switch was causing ip mis configuration, once we removed it, everything went back normal
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axl13Author Commented:
Replaced PC and problem solved...
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