11 Jan
2013
11 Jan
'13
8:29 p.m.
On 13-01-11 19:59, Karl Brumund wrote:
JF,
Long ago been fixed. Look at Cisco CMTS config documentation, particularly cable-source-verify.
Many thanks. In particular, you need "cable-source-verify dhcp" to prevent self assigned IPs that are unused by neighbours. Is this something that is now basically a default for all cable operators ? Or does this command add sufficient load to the CMTS that some cable operators choose to not use it for performance purposes ? What happens when a CMTS reboots and has an enpty database of DHCP leases ? Does it then query the DHCP server for every IP/MAC it sees that it doesn't yet know about ?