On Tuesday 13 March 2007 22:13, Paul Abrahams wrote:
> In fact I have fixed IP addresses assigned using my router's DHCP
> configuration page, but I don't like the idea of counting on that -- it just
> seems unnecessarily rigid.  
Try not to think of static reservations as a rigid method of implementing 
DHCP, but rather a flexible way to implement static IP's.
Static reservations are also quite reliable.

> Fully dynamic to me means that your 
> configuration continues to work no matter how the router decides to assign
> the DHCP addresses --- even in the case, say, where you're adding machines
> to the LAN or removing them unpredictably.
Agreed. Static reservations are a bit of a compromise with a fully dynamic 
configuration.

> I wonder -- if I remove all my machines from the LAN for a month (so the
> router forgets the configuration) and reconnect them in a different order
> than I did originally, will the IP addresses still stay the same? 
Yes. If you are really using static reservations, the router will not "forget" 
them.
It is often the client that keeps the address the same. When a DHCP client 
renews its address, it will first send a unicast to the previous DHCP server 
requesting a renewal or new lease of the same IP that it last had.

> I thought 
> the way DHCP works is that when the router sees a machine it hasn't seen
> before, it assigns it the lowest available IP number in the DHCP range.
Most do this. (Assuming, of course, that no reservation exists for that MAC 
address, and the client did not request a different address)


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