My IP Address is constantly changing

NickD

macrumors 6502a
Original poster
Mar 25, 2007
725
1
Colorado
. . . and it's getting really annoying because I portforward. Last night, in the Network Pref Pane, my IP's last 3 digits went from 108, to 107, to 101, to 105, to 103, and now back to 107.

Is there a way I can set up a simple static IP address?
 

xUKHCx

Administrator emeritus
Jan 15, 2006
12,587
6
The Kop
Can't you just select DHCP with manual address in network prefs. That is what i did under tiger.
 

newtonGOT

macrumors newbie
Mar 22, 2013
1
0
My IP address is changing, too

I can't figure out how to make it stop. I've been searching for an answer, but I haven't found much. I just have to keep reconnecting to the airport every time the IP address changes, which is annoying. My connection is also much slower than it was prior to this difficulty. Any thoughts?
 

benwiggy

macrumors 68020
Jun 15, 2012
2,186
15
You should be able to specify a manual IP address in the router's range. What happens when you do that?
 

switon

macrumors 6502a
Sep 10, 2012
636
1
RE: DHCP with reservations...

Hi NickD,

It sounds like your router is using DHCP to assign IP addresses to your machine on the local network. For some reason, your machine disconnects from the router, perhaps because it goes to sleep? When your machine asks to reconnect to the router, the router gives it a new IP address, thus your changing IP address.

If this is indeed what is happening, then you can eliminate this problem by configuring your router to use DHCP with Reservations whereby the router reserves certain IP addresses for certain machines. These machines will always get assigned the same IP address by the router whenever they connect. Machines that don't have reserved IP addresses will be assigned other non-reserved IPs by DHCP.

Regards,
Switon
 
Last edited:

hallux

macrumors 68030
Apr 25, 2012
2,788
494
Sounds like the DHCP lease on the router is VERY short. One way you can fix the IP address changing is to set up a reservation on the router for that computer. That allows you to maintain the configuration on your computer but also keep giving it the same address.
 
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