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New Member

Cisco uBR924 and Internet connection problems

Hello everyone!!

I have a question here, I need your help!

Recently I bought a Cisco uBR924 and I've been trying to connect it at home,

so I can expand my home lab capabilities. My service provider is Time Warner

(Road Runner) and I simply can't connect it to the Internet. This router has

one cable-modem interface, four ethernet ports (represented as 1 ethernet

interface) and two FXS voice-ports.

According to the Cisco's documentation, the service establishment process of

a

cable-modem-router like this one is as follows:

- Scan for a downstream channel and establish synchronization with the CMTS.

- Obtain upsteam channel parameters.

- Start ranging for power adjustments.

- Establish IP connectivity

- Establish the time of day

- Establish security

- Transfer operational parameters

- Perform registration

- Comply with baseline privacy

- Enter the operational maintenance state

When I issue "show int cable-modem 0", I notice a lot of "interface resets"

displayed by the output. Further investigation required me to run some debug

commands and - I love this one - "show controllers cable-modem 0 mac log",

which probably identified the problem. I could see almost all

"CMAC_LOG_STATE_CHANGE" events, but during the registration process

(registration_state), the modem received a "RESET_AUTHENTICATION_FAILURE".

I pasted part of the output so my question may be answered by someone:

The steps from "scanning downstream" to "establish security" seem to be

fine:

1041.159 CMAC_LOG_STATE_CHANGE wait_for_link_up_state

1041.159 CMAC_LOG_STATE_CHANGE

ds_channel_scanning_stat

1043.540 CMAC_LOG_STATE_CHANGE wait_ucd_state

1046.319 CMAC_LOG_STATE_CHANGE wait_map_state

1046.371 CMAC_LOG_STATE_CHANGE ranging_1_state

1047.337 CMAC_LOG_STATE_CHANGE ranging_2_state

1048.112 CMAC_LOG_STATE_CHANGE dhcp_state

1048.404 CMAC_LOG_DHCP_ASSIGNED_IP_ADDRESS 10.47.170.200

1048.404 CMAC_LOG_DHCP_TFTP_SERVER_ADDRESS 24.29.99.72

1048.404 CMAC_LOG_DHCP_TOD_SERVER_ADDRESS 24.29.99.72

1048.404 CMAC_LOG_DHCP_SET_GATEWAY_ADDRESS

1048.404 CMAC_LOG_DHCP_TZ_OFFSET 0

1048.404 CMAC_LOG_DHCP_CONFIG_FILE_NAME disabled.bin

1048.404 CMAC_LOG_DHCP_ERROR_ACQUIRING_SEC_SVR_ADDR

1048.404 CMAC_LOG_DHCP_LOG_SERVER_ADDRESS 24.29.99.57

1048.404 CMAC_LOG_DHCP_COMPLETE

1059.956 CMAC_LOG_STATE_CHANGE establish_tod_state

1059.956 CMAC_LOG_TOD_REQUEST_SENT 24.29.99.72

1059.964 CMAC_LOG_TOD_REPLY_RECEIVED 3252376461

1059.968 CMAC_LOG_TOD_COMPLETE

1059.968 CMAC_LOG_STATE_CHANGE

security_association_state

1059.968 CMAC_LOG_SECURITY_BYPASSED

But when the modem downloaded de DOCSIS configuration (the config file), I

noticed something weird:

1059.968 CMAC_LOG_STATE_CHANGE

configuration_file_state

1059.968 CMAC_LOG_LOADING_CONFIG_FILE disabled.bin

1063.988 CMAC_LOG_CONFIG_FILE_PROCESS_COMPLETE

Did you noticed the filename received by the Cisco uBR924? Its name is

"DISABLED.BIN". It doesn't sound good......

After that, the next step is "registration". Now I noticed that the CTMS

has, for an "unknown" reason, rejected the registration process. Therefore,

the router is unable to proceed with other steps toward the Internet

connection.

977.130 CMAC_LOG_STATE_CHANGE registration_state

977.130 CMAC_LOG_REG_REQ_MSG_QUEUED

977.138 CMAC_LOG_REG_REQ_TRANSMITTED

977.142 CMAC_LOG_REG_RSP_MSG_RCVD

977.142 CMAC_LOG_RESET_AUTHENTICATION_FAILURE

977.142 CMAC_LOG_STATE_CHANGE reset_interface_state

977.142 CMAC_LOG_STATE_CHANGE reset_hardware_state

I tried to configure this device at both bridge and routing levels, and it

didn't work at all.

Do you guys know if some ISPs have configured anything that could block

"unauthorized devices" (anything not the modem they provide us) to establish

internet connectivity? Do they make any kind of MAC addresses filtering?

I really don't want to use a plain modem to connect to the Internet.

Specially when I have a cool Cisco with a lot of interesting features.

Any help would be appreciated.

Leonardo Furtado

5 REPLIES

Re: Cisco uBR924 and Internet connection problems

Yes, some providers require you to use their provided equipment. Less so these days but maybe you just need to give them a call and it might be a matter of them registering your new modem / router with their system.

You might want to check one of the cable forums on www.dslreports.com - people there might have some more information on whats permitted with your provider.

New Member

Re: Cisco uBR924 and Internet connection problems

Hi, Thanks for your reply! I have one more question. I am able to change the Ethernet's MAC address (replacing the bia by another MAC address of my choice), but I am unable to perform the same task on the cable-modem interface. I don't know if this is a limitation of my current IOS version (12.1T) or is something really impossible to accomplish.

Do you have any idea about how to do it?

Thank you.

Leonardo Furtado

Re: Cisco uBR924 and Internet connection problems

Leonardo,

I did some googling on this and some others have this working with some providers but they needed to supply the provider with the MAC address (it's on the bottom of the unit). you apparently can't change it. The provider then needs to provision their side to work with your ubr. They might not do this but you can try. you can go to google groups and search for "ubr924 +mac-address" to hit some other discussions on this.

Also from Cisco docs:

Note The Cisco uBR924 cable access router is typically configured at the headend. Most cable service operators do not permit local configuration at subscriber sites.

--------------------------------------------------------------------------------

Caution

Before attempting to reconfigure a Cisco uBR924 cable access router at a subscriber site, contact your network management, provisioning manager, or billing system administrator to ensure remote configuration is allowed. If remote configuration is disabled, settings you make and save at the local site will not remain in effect after the cable access router is reset or powered off and back on. Instead, settings will return to the previous configuration.

Related Features and Technologies

The Cisco uBR924 cable access router is intended to be used in conjunction with a Cisco uBR7200 series universal broadband router or other DOCSIS-based CMTS located at the cable operator's headend facility

New Member

Re: Cisco uBR924 and Internet connection problems

I was wondering if you received any help with your ubr900. If so could u shaer it with me. kihei99@yahoo.com

New Member

Re: Cisco uBR924 and Internet connection problems

Most of the time your (ISP) will need the MAC address of your cable modem. So call up your ISP and tell them the MAC address. Once they configure it on their side, you should be fine. This is how I had to do it. I have the same modem/router (uBR924). It works great!

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