Comments on: DOCSIS and Cable Modems – How it works :: Cable Modem Registration http://volpefirm.com/docsis-101/docsis101_modem-registration/ A Technical Communications Company Wed, 16 May 2012 06:51:01 +0000 hourly 1 http://wordpress.org/?v=3.3.2 By: bradyvolpe.com | DOCSIS 3.0 Cable Modem Registration | bradyvolpe.com http://volpefirm.com/docsis-101/docsis101_modem-registration/#comment-120 bradyvolpe.com | DOCSIS 3.0 Cable Modem Registration | bradyvolpe.com Mon, 27 Feb 2012 20:51:26 +0000 http://bradyvolpe.wordpress.com/?p=143#comment-120 [...] order to be able to understand this article, I will make many references to my prior article on Cable Modem Registration which focused on DOCSIS 1.x and 2.0 cable modems (please consider this a prerequisite [...] [...] order to be able to understand this article, I will make many references to my prior article on Cable Modem Registration which focused on DOCSIS 1.x and 2.0 cable modems (please consider this a prerequisite [...]

]]> By: Brady http://volpefirm.com/docsis-101/docsis101_modem-registration/#comment-119 Brady Wed, 07 Dec 2011 12:57:35 +0000 http://bradyvolpe.wordpress.com/?p=143#comment-119 Hi Three Brothers, For any consulting related posts, please refer to my consulting related site at <a href="http://volpefirm" rel="nofollow">The Volpe Firm</a>. Thanks and looking forward to hearing from you. Regards, -Brady Hi Three Brothers,

For any consulting related posts, please refer to my consulting related site at The Volpe Firm.
Thanks and looking forward to hearing from you.

Regards,
-Brady

]]> By: Three brothers & company http://volpefirm.com/docsis-101/docsis101_modem-registration/#comment-118 Three brothers & company Wed, 07 Dec 2011 10:57:58 +0000 http://bradyvolpe.wordpress.com/?p=143#comment-118 Dear sir we have work underground networking access net and overhead building constructions releated job so cable fiber and server work do my company has worked large company which is telcome commucation.so we provide work cable. Regarding Three Brothers & Co. Mo.No.- 09312523790 Dear sir
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]]> By: Brady http://volpefirm.com/docsis-101/docsis101_modem-registration/#comment-117 Brady Thu, 01 Dec 2011 17:22:28 +0000 http://bradyvolpe.wordpress.com/?p=143#comment-117 Hi Tani, You should be able to setup a DOCSIS network with the Nortel1000, which I believe is actually a Cornerstone1000 CMTS. The operating system (IOS) is likely old and most likely only support DOCSIS 1.0. You can probably find someone who can provide you with an update to 1.1 for that model if you check around on the forums. You would then integrate your radius server into your DHCP server for provisioning CPE devices access to the network. The cable modems themselves should be put on a local, non-route-able subnet, such as a 10.0.0.0 or 192.168.0.0 network. -Brady Hi Tani,

You should be able to setup a DOCSIS network with the Nortel1000, which I believe is actually a Cornerstone1000 CMTS. The operating system (IOS) is likely old and most likely only support DOCSIS 1.0. You can probably find someone who can provide you with an update to 1.1 for that model if you check around on the forums. You would then integrate your radius server into your DHCP server for provisioning CPE devices access to the network. The cable modems themselves should be put on a local, non-route-able subnet, such as a 10.0.0.0 or 192.168.0.0 network.

-Brady

]]> By: Tani http://volpefirm.com/docsis-101/docsis101_modem-registration/#comment-116 Tani Sat, 26 Nov 2011 09:17:29 +0000 http://bradyvolpe.wordpress.com/?p=143#comment-116 Thanks a lot for your help. I'm new on that. I have a CMTS Nortel 1000. I plan to build a radius server. I have also a mikrotik router 1100. My question: It is possible that, with this software and hardware to connect Cable modems at my network , or I may need something else? Thanks a lot Tani Thanks a lot for your help. I’m new on that. I have a CMTS Nortel 1000. I plan to build a radius server. I have also a mikrotik router 1100. My question: It is possible that, with this software and hardware to connect Cable modems at my network , or I may need something else?
Thanks a lot
Tani

]]> By: Brady http://volpefirm.com/docsis-101/docsis101_modem-registration/#comment-115 Brady Thu, 17 Feb 2011 18:12:11 +0000 http://bradyvolpe.wordpress.com/?p=143#comment-115 The Range-Request (or Station Maintenance) that occurs at least once every 30 seconds does not cause a DHCP. If you modems are re-registering every 24-48 hours it is likely because your DHCP expiration time is set to a very short time. Check your DHCP server (CNR) and look at the lease time of your IP addresses. Make sure that it is set to something like 7 days or maybe 1 year, depending upon your needs. -Brady The Range-Request (or Station Maintenance) that occurs at least once every 30 seconds does not cause a DHCP. If you modems are re-registering every 24-48 hours it is likely because your DHCP expiration time is set to a very short time.

Check your DHCP server (CNR) and look at the lease time of your IP addresses. Make sure that it is set to something like 7 days or maybe 1 year, depending upon your needs.

-Brady

]]> By: Net Engineer http://volpefirm.com/docsis-101/docsis101_modem-registration/#comment-114 Net Engineer Wed, 19 Jan 2011 02:44:16 +0000 http://bradyvolpe.wordpress.com/?p=143#comment-114 Quick question: You mentioned that the CM receives a new range request at least once every 30 seconds. When the CM re-ranges per say, does it follow the other steps afterward such as DHCP and TFTP download as well? I'm trying to figure out here if there is anything that would cause a CM to request/download a new TFTP file besides a hard reset. I know that when the DHCP request is sent out to the DHCP server, DHCP IP info as well as configuration file name from TFTP info is sent back. So when the modem receives the TFTP file info back from the DHCP server -- If the TFTP filename is different, would the CM then download the new file? Just wondering... I have a setup here using CNR and a uBR10k and SOMETHING is causing our modems to update their configs every 24-48 hours. DHCP requests would make sense. Quick question:

You mentioned that the CM receives a new range request at least once every 30 seconds. When the CM re-ranges per say, does it follow the other steps afterward such as DHCP and TFTP download as well?

I’m trying to figure out here if there is anything that would cause a CM to request/download a new TFTP file besides a hard reset. I know that when the DHCP request is sent out to the DHCP server, DHCP IP info as well as configuration file name from TFTP info is sent back. So when the modem receives the TFTP file info back from the DHCP server — If the TFTP filename is different, would the CM then download the new file?

Just wondering… I have a setup here using CNR and a uBR10k and SOMETHING is causing our modems to update their configs every 24-48 hours. DHCP requests would make sense.

]]> By: sam http://volpefirm.com/docsis-101/docsis101_modem-registration/#comment-113 sam Mon, 17 Jan 2011 17:07:09 +0000 http://bradyvolpe.wordpress.com/?p=143#comment-113 im noob on subject but interested,and helpfull thanks brady. im noob on subject but interested,and helpfull thanks brady.

]]> By: Jonathan S http://volpefirm.com/docsis-101/docsis101_modem-registration/#comment-112 Jonathan S Tue, 07 Dec 2010 23:42:26 +0000 http://bradyvolpe.wordpress.com/?p=143#comment-112 Brady, Nice work. I was just catch up on the new 3.0 standards the other day, having to review some old the older standards since its been so long. I did a fair amount of reading a while back about this, never really playing with it due to the legality of it; Modem capping, which is becoming harder as the standards are built with higher security standards. Upstream capping, little more comfortable with this. Downstream capping, looks like it is more based on a transmission control protocol conforming to its standards. If accessed a tcp application that was pumping data that exceed the cap, then ack packages would be missed and tcp backoff procedures would come into play (CM would drop data). For UDP streamed, even though the CM may drop the data, the data may keep flooding the network, exceeding the customer contract. Looks like most of the policing itself would still have to come at the headend to enforce customer contracts. Brady,

Nice work. I was just catch up on the new 3.0 standards the other day, having to review some old the older standards since its been so long.

I did a fair amount of reading a while back about this, never really playing with it due to the legality of it; Modem capping, which is becoming harder as the standards are built with higher security standards.

Upstream capping, little more comfortable with this. Downstream capping, looks like it is more based on a transmission control protocol conforming to its standards. If accessed a tcp application that was pumping data that exceed the cap, then ack packages would be missed and tcp backoff procedures would come into play (CM would drop data). For UDP streamed, even though the CM may drop the data, the data may keep flooding the network, exceeding the customer contract.

Looks like most of the policing itself would still have to come at the headend to enforce customer contracts.

]]> By: IPv6 Provisioning Truths Explained Part 2 - CableHack - You got it? We mod it! http://volpefirm.com/docsis-101/docsis101_modem-registration/#comment-111 IPv6 Provisioning Truths Explained Part 2 - CableHack - You got it? We mod it! Tue, 16 Nov 2010 03:06:58 +0000 http://bradyvolpe.wordpress.com/?p=143#comment-111 [...] [...] [...] [...]

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