1) Cable modem searches downstream frequencies, the Hamster in the modem twiddles the tuning knob until he hears Radio DOCSIS.
2) Modem listens to the parameters of the channel so that the Hamster can observe good manners in knowing when to speak on the phone in and what number to call.
3) Hamster speaks, uBR listens and tells Hamster how loudly to speak, and when so that Hamster can win the phone in prize of getting online.
4) Hamster, feeling somewhat lacking in identity, requests an IP address. uBR proxies this request and forwards it to DHCP servers, configured on it as cable helper addresses.
5) Once Hamster has an IP it requests a config file from the TFTP server specified in the DHCP offer it received earlier.
6) Once Hamster has a config file to tell it how and when, and how much it can talk it asks for the time.
7) Once Hamster has the time it begins its' jibba jabba.
When a router or PC is connected to the cable modem it asks for an IP address, the modem forwards this request to the uBR which forwards it to DHCP servers configured as IP Helpers, and then forwards the response.
When the uBR needs to work out which modem has what devices attached to it it can either ARP for them or ask the DHCP server depending on how it's been configured.
---------- Post added at 19:27 ---------- Previous post was at 19:03 ----------
Quote:
Originally Posted by r00t
Wrong again Gary. The command used to query the uBR to give you the start and end time of STM puts load on the uBR.
Go download netlimiter or some other such tool.
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Wrong r00t it's not the uBRs that are under load it's the ACS authorisation server.
So purely a case of VM needing to upgrade their internal AAA setup.
Had we been given this information straight away instead of you giving out incorrect info along with your helpful netlimiter suggestion it would've saved a 4 page thread, fun though it was. It's still pretty appauling that VM have to limit the amount of commands people can use managing their kit, laughable infact, but it's not a CMTS loading issue.
*Note to self don't listen to r00t.