On Thursday 18 February 2010 09:50:36 pm Emmanuel Sekyewa wrote: > Dan, LOL! never under estimate the power of a user :-)! > Hi Chris, > After unsuccessfully looking for any other device that > might have been responding to DHCP requests, I > remembered that there was a strange looking switch in > one of the offices, and also that I had seen a similar > one at a different place altogether that was doing DHCP > for the machines on that network, so I disconnected it, > and gave those users another one :-)
Become friends with DHCP Snooping to prevent such issues in
the future:
http://en.wikipedia.org/wiki/DHCP_snooping
RA Guard is the equivalent activity for IPv6. However, no
vendor that I know of is currently implementing it (draft
state):
http://tools.ietf.org/html/draft-ietf-v6ops-ra-guard-04
The interim solution to this problem in the IPv6 world is to
implement RFC 4191 - Default Router Preference (DRP).
Authored by Microsoft, most router vendors support this
feature (at least Cisco and Juniper do). It's rather coarse,
but it's what we have for the time being.
Cheers,
Mark.
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