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Originally Posted by Achelon
How is my subnet determined, is it done by the UBR's? Could it be changed by the user?
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Your working subnet-mask is issued to your PC by DHCP, along with the IP address. So ultimately, it is issued by NTL's DHCP servers (the UBR just acts as a DHCP relay). It is not possible for users to change it, nor would there be anything to be gained thereby: if the subnet mask is not exactly correct, then some parts of IP communication will stop working.