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Question about Cable Modems in general

mather 462 41 February 22, 2016 at 10:31 AM
I'm new to Comcast Xfinity and I purchased my own SB6183 modem. It's just a modem, no wifi, my question is if there are any password or login tor the modem? I've been with AT&T Uverse so I'm not entirely sure how cable side of things work.

I can't find anything in the Arris manual related to password or login, etc. I do see the status, configurations, and such on my browser. I'm guessing there are none, just want to check with others.

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#2
nope. none. just tell your cable provider to add the modem, and it's ready to go.

but you are suggested to get a router. the modem can do routing but it's only got one physical port and no wifi.
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#3
Thanks for the info on pwd, I am using my current router as I wanted to keep costs down and the router <> modem separate.
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#4
no. Same here.... xfinity and 6183. I upgraded to 75 within the last few months and had to call them to "reset" the bandwidth cap twice but in the end it worked.
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#5
There's no username or password because only the cable company can make changes to the modem. You can look at the signal levels, status, etc. and restart the modem from your browser. The cable company can update the firmware, reset your modem, etc. from their side. Part of the spec for cable modems is that the end user can't make changes to them. It makes life easier for support, as they don't have to deal with people making changes that screw up their service.
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Quote from mather View Post :
Thanks for the info on pwd, I am using my current router as I wanted to keep costs down and the router <> modem separate.
That makes sense. Good for using the router. You want the NAT firewall at the end of the day.
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Quote from HarryH3 View Post :
There's no username or password because only the cable company can make changes to the modem. You can look at the signal levels, status, etc. and restart the modem from your browser. The cable company can update the firmware, reset your modem, etc. from their side. Part of the spec for cable modems is that the end user can't make changes to them. It makes life easier for support, as they don't have to deal with people making changes that screw up their service.
Thanks, good info to know. From the looks of it, only the cable company can update the FW. Do they do it regularly to keep up with bugs, hacks, etc.


Quote from LiquidRetro View Post :
That makes sense. Good for using the router. You want the NAT firewall at the end of the day.
I would prefer to keeps things separate, the more integration, the more likely for a part to go bad and bring down the rest. Smilie
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Quote from mather View Post :
Thanks, good info to know. From the looks of it, only the cable company can update the FW. Do they do it regularly to keep up with bugs, hacks, etc.
Any updates you may receive are quite infrequent. The cable modem is more or less transparent to the traffic that passes through it. The only interfaces for configuring it are only accessible to the cable company. I think the docsis standard is mature enough you don't need to be too concerned.
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#9
Looking at it more it seems there is some information available by browser:

EVENT LOG at
http://192.168.100.1/RgEventLog.asp

PRODUCT INFORMATION with firmware level at
http://192.168.100.1/RgSwInfo.asp



I am not at home to test but see the tabs at the top, e.g. "Configuration" - wonder what these do, if they are active.
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If you actually want into the modem settings you can try
http://192.168.100.1 or http://10.0.0.1

I had to do this once when measuring my modems signal due to connection related issues. That was years ago but I bookmarked the useful post.http://forums.xfinity.com/t5/Basi...1#U1253381


Like others mentioned though, for setup, you only need to contact the ISP and have them register it via the serial number.
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#11
Quote from Dr. J View Post :
Looking at it more it seems there is some information available by browser:

EVENT LOG at
http://192.168.100.1/RgEventLog.asp

PRODUCT INFORMATION with firmware level at
http://192.168.100.1/RgSwInfo.asp



I am not at home to test but see the tabs at the top, e.g. "Configuration" - wonder what these do, if they are active.
All the tabs are active, but they are read-only. The only "changes" the end-user can make is A) reboot the modem or B) reset all settings to default. Note that if you click on the latter, it can take 30 minutes or more for your modem to get back online because it then has to query the upstream equipment for its configuration details.

Note that this restriction is not unique to this brand, it is a requirement that any modem must have to meet DOCSIS certification requirements.
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Quote from HarryH3 View Post :
All the tabs are active, but they are read-only. The only "changes" the end-user can make is A) reboot the modem or B) reset all settings to default. Note that if you click on the latter, it can take 30 minutes or more for your modem to get back online because it then has to query the upstream equipment for its configuration details.

Note that this restriction is not unique to this brand, it is a requirement that any modem must have to meet DOCSIS certification requirements.
"Back in the day" I recall people being able to screw with the modem config to boost their speeds - they'd be overwritten by the provider after some time though.
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#13
Quote from Dr. J View Post :
"Back in the day" I recall people being able to screw with the modem config to boost their speeds - they'd be overwritten by the provider after some time though.
There's a throwback from 10-15 years ago. I believe they were called "uncappers", there was also a way to listen in on traffic from other users on the same cable node. Times have changed, by the time of DOCSIS 1.1 and especially DOCSIS 2.0 this was more or less over.
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