"option netbios-node-type 2" being ignored by macs

Tim Cantin tcantin at wellesley.edu
Wed Nov 13 14:39:48 UTC 2013

Hi folks,

We're running Internet Systems Consortium DHCP Server V3.0.5-RedHat. 
We're having a widespread issue of many of our macs broadcasting netbios 
name server lookups, ignoring our global setting (option 
netbios-node-type 2). Student macs appear to be OK, and a vanilla mac as 
well... but once it has our image on it, this happens. Short of running 
around pummelling those macs into submission with manual fixes (because 
we don't remotely manage them... that's another problem, but let's not 
go there right now) - which is to disable netbiosd, has anyone ever 
dealt with this before and if so is there anything you know of that can 
be done to alleviate the problem? We're about to go chop nbns off at the 
knees on our NAC server if we can, but if these macs were behaving in 
the first place it would be a cleaner solution. Is it possible there's a 
compatibility issue between ISC dhcpd and Apple's dhcp client such that 
they ignore the netbios-node-type setting?

Thank you

Tim Cantin, Network Engineer, Systems and Networks Support
Wellesley College, Library and Technology Services
Clapp Library, Knapp Center, Suite 105
106 Central Street Wellesley, MA 02481-8203

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