DHCP IP address not starting with 10

wolfmajor

Thread Starter
Joined
Apr 25, 2011
Messages
2
All, anytime my laptop (MacBook Pro running Big Sur 11.6) starts acting up, I check the assigned IP address. Normally, the address starts with 10, but when it's been assigned an address starting with 192, I can't access the internet. If I manually assign an IP like 10.0.0.99, it's good to go. Same thing happens on another family member's MacBook Pro and my sister's Dell Windows system. Sometimes, it'll be running correctly, then suddenly stop accessing the internet.

Any ideas on why this is happening?

I have Comcast and a rented wifi router (the newest one).
Thanks.
 
Joined
Dec 4, 2020
Messages
221
All, anytime my laptop (MacBook Pro running Big Sur 11.6) starts acting up, I check the assigned IP address. Normally, the address starts with 10, but when it's been assigned an address starting with 192, I can't access the internet. If I manually assign an IP like 10.0.0.99, it's good to go. Same thing happens on another family member's MacBook Pro and my sister's Dell Windows system. Sometimes, it'll be running correctly, then suddenly stop accessing the internet.

Any ideas on why this is happening?

I have Comcast and a rented wifi router (the newest one).
Thanks.
Since you are renting your router from Comcast, it would be best to contact Customer Support or their Technical Support regarding this issue. They would be best to assist you with the router issue since both computers are being affected (laptop and the Dell unit).
 

Couriant

James
Moderator
Joined
Mar 26, 2002
Messages
42,064
Do you have any other routers connected to the modem? I agree with Nader though, check with Comcast as your modem (I assume a wireless modem?) should not have 2 separate networks like that.
 
Joined
Oct 14, 2021
Messages
4
Are there other networks (wifi) that your laptop may be joining? Make sure you are connected to your own (Comcast router) / network. Comcast default uses 10.0.0.* address space. Since you are getting a 192... that is another network.

More advanced:
Some newer routers also have additional networks that can be configured (Virtual LAN). These will be issolated from the default LAN. These are used for IOT devices or for guests. These can be configured with 192 or other 10. DHCP scopes. If you are not using these, change the SSID(network name) or disable them.
 
Last edited:

zx10guy

Trusted Advisor
Spam Fighter
Joined
Mar 30, 2008
Messages
6,798
I agree with the others. Assuming you are connecting to the right SSID, there has to be a "rogue" DHCP server on your network. Are you running an extra wireless router acting as an access point to extend wireless coverage on your network?
 

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