syslog msgs: dhclient & n'bour table overflow

[michael <linux@networkingnewsletter.org.uk>]

I get the following many, many times (not necessarily together and many, 
many more of the latter) in my 'syslog' but can't see what I've not set up:

localhost dhclient: Option option-105 length 255 overflows input buffer.

localhost kernel: Neighbour table overflow.

Which HowTo have I missed? :)
Thanks, Michael