Hi, everyone
I'm seeing a whole lot of these messages in dhcp log for varios cable modems:
Jul 15 09:28:11 mynetwork dhcpd: DHCPREQUEST for 10.67.4.17 from 00:13:11:a6:96:0f via eth2
Jul 15 09:28:11 mynetwork dhcpd: DHCPACK on 10.67.4.17 to 00:13:11:a6:96:0f via eth2
Jul 15 09:28:11 10.67.4.17 CABLEMODEM[DOCSIS]:<68010100>DHCP RENEW sent - No response
It looks like DHCPACK from the dhcp server doesn't arrive on time or doesn't arrive at all. The strange thing is that when I ping the cable modem, there is no packet loss. Neither latency is high.
Has anyone seen that in his network? How could I troubleshoot further?
Thanks in advance
This is probably due to a firewall, bad route or interface setup.
Please provide output from the following commands (I assume the DHCP-server is Unix-like):
ifconfig eth2
ip route
(and firewall settings as well, if using iptables try iptables -vnL INPUT )
Is the CMTS a router or bridge? In case of a router you probably needs a helper-address, and correct routes to get to it (and back).
-Bob-
Do you resolved this problem ? I have the same and I have no idea how to solve this.
I have the following problem:
when I disconnect the network cable from the computers behind the modem and reconnected (or when an electrical fault in the network, which causes the modem to restart) these do not renew their ip, but remain with them had been assigned before, but I lose connectivity to the modem and the rest of the network
I´ve check the cable helper addres, the routes, the DHCP server and stop the firewall and can´t find the error
Funny thing is that only occurs with linux boxes and some routers, in windows, if try to repeat the fail (unplug the rf cable) and waith for the cm re registration, windows acquires the same ip and can navigate.
In the case of linux and routers are just sending arp packets (to broadcast 255.255.255.255) without a response
Otherwise I can not do is change the ethernet cable between two computers and the second gets an IP address automatically without having to power cycle the CM
how disappointing is that my configuration, in other systems (same bsr2000 cmts and same CM) works ....!!!!