New Contributor
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3 Messages
SB6121 Modem Won't assign IP
Trying to get internet setup at my mom's house. She just relocated to AZ.
Tech left her house and said internet was good. I come over to try and setup her wifi etc.
Cannot get the modem to assign router an IP address for anything.
Finally I give up and try connecting laptop directly to modem. After numerous reboots of the laptop and modem and tryign a different laptop I gave up...
I noticed that very momentarily when you reboot the modem it would assign an IP to the router. But it would assign it an internal IP of 192.168.100.10 instead of a public internet IP address. Within a few seconds though it would drop the address and the router would have nothing.
All the while the modem has all lights connected and shows it's on the "internet"
Found people talking of similar issues with comcast:
http://forums.comcast.com/t5/Basic-Internet-Connectivity-And/Motorola-SB6121-and-unidentified-network-Not-getting-Public-IP/td-p/1953955
Any ideas here?? Guess need to get tech back out here. Even though modem says "online" I dont think it's fully configured right.
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Health_Edge
Valued Contributor III
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4.2K Messages
What IP do you get stuck with? 169.x.x.x? 172.x.x.x or 0.0.0.0? Sounds like it doesn't have the correct configuration code.
And is the modem new or second hand?
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jgree32
New Contributor
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3 Messages
I get just the autoconfig IP of 169.xxx..... something.
Modem was brand new.
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DerrickW
Valued Contributor
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1.2K Messages
Sounds like there are some things we need to double-check on our end. Can you please email us at cox.help@cox.com with the name and address listed on the account? We'll figure out what's causing this to happen.
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jgree32
New Contributor
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3 Messages
Cox support via phone was able to resolve the issue. Some sort of "reset" and the modem was giving out public IP address as it should to the router.
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