"Steve Walker" wrote in message
...
On 06/02/2021 22:00, Chris Green wrote:
Harry Bloomfield, Esq. wrote:
Chris Green has brought this to us :
Unless you re-use addresses that happens anyway with DHCP, I don't
think any system on my LAN has ever changed its IP and nearly all are
assigned by my DHCP server.

Switched off, items can time out from the DHCP server, unless you set
them up not to.

Yes, but when they reconnect they get the same IP back. E.g. I go
away for weeks at a time with my laptop but when I come back home it
always gets the same IP. This is how it's meant to work, the DHCP
server *does* remember MAC addresses and will give the same address to
the same device every time unless there's a very good reason for not
doing so.

But if you have a power cut or switch the electric off to do some DIY, the
server and a number of devices will all lose power and may not get the
same addresses - they may, but there is no certainty.

No reason why the best routers cant keep that very small
table in non volatile memory so that doesnt happen.