Trying to debug an issue with a misbehaving cable modem on a C40g.
I'm using the 'mirror cm' command together with tcpdump and it's generating a packet capture, however I'm stuck at the following step:
"On the TFTP server, run the ccap command (./ccap test.out) to create a file called out.cap. Use FTP to transfer this file to a PC running Wireshark (or equivalent program). Change the Wireshark settings by editing preferences and Protocols: Frame by checking off the “Treat all frames as DOCSIS frames” box. Wireshark will decode the DOCSIS control packets."
I'm seeing high utilization on a specific node, with not a lot of subscribers (88), using ATDMA, QAM64, 4 mini-slots, any recommendations on how I can lower this? Not sure what's causing it, could it be a user? Have 6 upstreams and they are all constantly over 90% and I have reports from time to time of voice problems in the upstream direction.
I currently use a software that I develop in php to edit the dhcpd.conf file, after I make a change I have to restart for the changes to be applied, also only one person can use it, because if two people, for example, coincide editing or doing a registration of a new user can cause an error in the correct writing of all the information in the dhcpd.conf file.
What alternative can I use to solve this, to have a dhcp that several people can manipulate at the same time, to edit, register, change plans, without any problem.
we have a Casa 3200 with 24DS (EuroDOCSIS).
Service-group 1: 16DS, 8US
Service-group 2: 8DS, 4US
Fiber uplink 500Mbit/s Down
Now we have the following problem:
We only get around 190Mbit/s per service-group and modem. That mean if we use 2 modems from the service-group 1 we reach about 190Mbit/s in DS per Modem => in sum 380Mbit/s throughput. In our configfile we definite a DS with 500Mbit/s for testing. But this will never reached.
I'm seeing an odd problem on a Cisco UBR10012 K regarding my EMTA based modems.
I assign the following, 10.10.0.0's to CM only's. 10.20.0.0's to CM portion of EMTA and 10.30.0.0's to MTA portion of EMTA.
ARP timeout is set to 43200 on CMTS (12 hours), DHCP set to 12 hours on EMTA subnet, ARP entry is being expired on the MTA portion, fix is to set DHCP timeout to less than ARP timeout, however I want to actually push these out to weeks, like my CM expiry.
I am trying to use frequencies higher than 42Mhz in an Upstream port of the CMTS C100G Casa Systems.
Add in my network some Ubee EVW3226 modem that support (5-85Mhz), they have eight bonded downstream channels and
four bonded upstream channels
with AttributeMask in the docsis file I indicate to this cable modem model that it only use the 4 frequencies higher than 42Mhz
In this same port I also use other cable modem models that only support (5 - 42Mhz)
this works fine. I am testing with 7 modem Ubee EVW3226
