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Dynamic DNS and Dynamic NAT

I have a laptop.  When I bring it into our office it dynamically gets an address from our DHCP Server.  I can't set the IP address on the laptop to static, since the laptop goes home onto another network.  I want to get the same IP address every time when I get into the office so that I can have port forwarding to that same IP.  However, my DHCP server does not allow reservations.  Is there any way to make sure I get the same IP address every time?
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rid
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It's in the hands of your IT administrator. There are ways to force the DHCP server to associate a MAC address with an IP address, but your IT policy may not allow this. The same goes for port forwarding in the office firewall.
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However, there is a DHCP server at both locations.  How can I make sure the Alternate Settings IP address is used when I have a DHCP server present?
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