KingDaveRa is mostly right, reallocation is not the same as static or "may as well" though.
DHCP on a lot of systems will issue an IP and make it yours for a certain period of time (varies wildly from 0-infinite time). During your lease period you will receive your existing ip, outside of this you may receive another ip. However the client "should" at lease time be given a lease duration time, in turn the client if sufficiently mature will then auto renew giving the appearance of a static ip for a while. However turn your pc off, time expires ip is available to anyone.
Obviously the DHCP server keeps record of client MAC addresses longer than your new one, this suggests that you new router is "more compliant" with modern standards by default. DHCP is not and should not be almost static, in a home environment this usually does not present a problem at home users tend to stick to 255.255.255.0 subnets which means you can have 254 devices on at all times so it matters little if DHCP is giving long/indefinte lease times. However manufacturers are now pushing the SOHO angle, that their home office equipment is also suitable for the small to medium business market hence greater compatibility with DHCP standard.
---------- Post added at 21:21 ---------- Previous post was at 21:19 ----------
Quote:
Originally Posted by cableguy1
cheers for that. I understand what you say but I dont understand why I was able to change the IP many times when I plugged my Wired router in.... same DHCP...
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Sorry can't be same DHCP if you switching routers and getting DHCP from the device.
Where are you getting DHCP then?