Loss of Internet Connection when Changing MAC Address to Change IP

Toggle sidebar Toggle sidebar
M

michaelbaker120

Reputable
Dec 25, 2015
19
0
4,510
For security reasons I often need to change my Public IP Address. I am able to do so by changing the MAC Address in my Router, but about 1 out of every 5 times I change my MAC Address I lose internet connection and I have to reboot my modem in order to regain internet connection. I have Time Warner Business internet; I also previously had Comcast Business Internet and I would also lose internet connection at about the same rate with Comcast when changing my MAC Address.

When I lose internet connection, I am able to regain internet connection quickly by selecting the "Quick Internet Setup" in my Asus router which says detects internet connection and obtains WAN IP address successfully, but the MAC address is changed to my router's default so it does not change the IP.

Does anyone know why I would lose internet connection about 1 out of every 5 times when changing my Router's MAC address? Is there a setting that could be changed to either prevent loss of connection or make it less likely?
 
Solution
jsmithepa
Well that's great that you found a loop hole, but it doesn't mean the ISP will go along with your trick.

U can analyze it from the view point of getting a DHCP lease from your LAN, once an IP is obtained, the upstream device "remembers" your MAC, you disconnecting/changing the MAC it doesn't make the old MAC goes away, not immediately anyway. If you try this on your LAN, you will find a similar reaction. If somehow you can RELEASE the old IP first (I have no idea how you do that with a WAN port), change MAC, THEN re-acquire new IP, I think that will work better (I hope).
Sort by date Sort by votes
getochkn

getochkn

Polypheme
Jul 2, 2006
12,407
54
65,040
I don't get why you need an new IP all the time or what you're doing.

And maybe the modem doesn't pick it up after a certain amount of times, I dunno. It's not really a thing that's meant to be done all the time. More just has to do with DHCP leases and such.
 
Upvote 0 Downvote
kgrevemberg

kgrevemberg

Distinguished
May 2, 2013
670
0
19,160
It could be that when you change your mac, the ISP sees a new mac with an already used ip address and hits the brakes on it. It could also be that when your router changes its mac it doesn't know it is doing it to get a new IP so it doesnt send out a request. Why would it if it thinks it already has a usable ip right? So there is a stall while your router thinks its good to go but the isp says "no way, ive used that ip for someone else, you need to send a new request bud" instead of your router telling the isp this is the ip i am going to use.


idk, maybe :)
 
Upvote 0 Downvote
jsmithepa

jsmithepa

Polypheme
Jun 14, 2014
13,096
263
60,840
Well that's great that you found a loop hole, but it doesn't mean the ISP will go along with your trick.

U can analyze it from the view point of getting a DHCP lease from your LAN, once an IP is obtained, the upstream device "remembers" your MAC, you disconnecting/changing the MAC it doesn't make the old MAC goes away, not immediately anyway. If you try this on your LAN, you will find a similar reaction. If somehow you can RELEASE the old IP first (I have no idea how you do that with a WAN port), change MAC, THEN re-acquire new IP, I think that will work better (I hope).
 
Upvote 0 Downvote
Solution
You must log in or register to reply here.

TRENDING THREADS

Latest posts

Moderators online

Share this page

COMPANY
RESOURCES
FOLLOW
Top Bottom