| Attachment | Size |
|---|---|
 example.JPG | 113.64 KB |
 dhcpd.conf_.txt | 1.22 KB |
| ubr_tc7246x1-confg.txt | 8.6 KB |
Hi Everyone!,
I have a cisco uBR7246VXR
Motorola C8U Upconverter
DOCSIS DS on 561MHz.
provisioned with freeBSD.
CM are Motorola SB4200 and SA WebStar for now
I have two ip pools one for cable modems 10.10.0.0/22
and another range for CPE 172.16.0.0/22
The current configuration allows two CPE behind the Cable Modem.
The situation is that cable modems receives IP address since you connect then to RF cable.
But when the CPE is an Access Point does not acquire ip.
You have to turn off the AP and turn it on again to receive IP.
Once you get ip, it takes hours working fine,
then miss ip address and you have to do the same thing again.
i dont know what else to do :(
This case happends also with computers but frequenty is with the AP.
I tested with DOCSIS 1.0 and DOCSIS 1.1 and the same thing happens.
WHAT COULD IT BE?
Attached an example of this case. Using a SB4200 with a Linksys Wrt54g
in this case the CPE (AP) remained approximately 24 hours online.
First of all show configuration :) so we could check it. The US SNR is quite poor. Do You have ip dhcp smart-relay on?
I attached two files,
cmts running config and other one with dhcpd.conf
Really Hope we could find an answer.
JBMartinez.
Looks weird that You have 3200000 channel witdh and 1600000 upstream channels spacing (Cable 3/0) - wrong! Looking further :) Also add ip dhcp smart-relay.
Check when you can't take ip from dhcp , how many mac's from PC's are on modem, check by snmp. The modem learn mac's pc that who connect to the router and write bad password to the router.
snmpwalk -c community -v 2c IP_modem 1.3.6.1.2.1.17 | grep -i hex
I can't do that because have to conect directly to the CM.
JBMartinez.
Press button one sb4200, then you can take IP from modem, look on the modem site http://192.168.100.1 , click on addresses and there you will find how many mac's modem learn.
The CM learned the AP Mac Address.
JBMartinez.
We remove the leases and now everithing is fine.
Cable Modem have two days having Access Point like CPE.
I dont know if this is good but its working Great!
JBMartinez.
I use to have this configuration on Cable 3/0:
cable upstream 0 frequency 28000000
cable upstream 1 frequency 26208000
cable upstream 2 frequency 24608000
cable upstream 3 frequency 23008000
cable upstream 4 frequency 21408000
cable upstream 5 frequency 19808000
all of them with channel-width 1600000 1600000
Then we change it to channel-width 3200000 3200000 because someone said
that probably the channel with was the problem. But the problem persists.
Is there any difference using 32000000 instead of 1600000??
im reading about the "ip dhcp smart-relay" sentence because i never used before.
JBMartinez.
...change channel spacing accordingly ie. 20000000 -> 23200000 -> 264000000 and so on.