Big Temporary Networks

William Herrin bill at
Sat Sep 22 06:12:03 UTC 2012

On Fri, Sep 21, 2012 at 10:42 PM, Masataka Ohta
<mohta at> wrote:
> William Herrin wrote:
>> that's getting close to omnipresent even in the low end APs. With this
>> feature enabled, stations are not allowed to talk to each other over
>> the wlan; they can only talk to hosts on the wired side of the lan.
>> The DAD packets are simply never sent to the other stations.
> You are saying to disable DAD, which is a violation of SLAAC.

We do that on some wired ethernets too. The Cisco configuration
command is "switchport protected." It helps control virus outbreaks if
machines designated clients can't talk to each other at layer 2,
regardless of how that annoys layer 3.

Does this bother you? Tough.

Bill Herrin

William D. Herrin ................ herrin at  bill at
3005 Crane Dr. ...................... Web: <>
Falls Church, VA 22042-3004

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