Question about DOCSIS DHCP vs ARP
jfmezei_nanog at vaxination.ca
Sat Jan 12 01:29:23 UTC 2013
On 13-01-11 19:59, Karl Brumund wrote:
> 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 ?
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