Using class to match iPhones, Wiis etc

Mark S. Turczan mturczan at
Fri May 8 15:08:14 UTC 2009

On May 8, 2009, at 10:09 AM, Chuck Anderson wrote:

> On Fri, May 08, 2009 at 08:48:14AM -0500, Peter Laws wrote:
>> Randall C Grimshaw wrote:
>>> I will make a guess that it might be possible to set a QOS (cos)  
>>> (dscp) priority on the dhcp traffic. Have you asked Cisco?
>>> Classifying the clients in DHCP isn't going to solve a load issue  
>>> at the firewall.
>> Not directly, but if we can give the hosts that sit in one place  
>> (i.e.
>> laptops) longer leases, it cuts down traffic that has to pass  
>> through.
> Even better than matching on MAC address or Parameter Request List is
> to use the Vendor Class Identifier, that's what it's there for.  E.g.,
> for HP printers:
> class "Class-HP-JetDirect" {
>        match if option vendor-class-identifier = "Hewlett-Packard  
> JetDirect";
>        filename "hp-printer.cfg";
>        next-server w.x.y.z;
>        option hp-tftp-configuration-file "hp-printer.cfg";
>        option hp-tftp-server w.x.y.z;
> }

Does anyone know what the VCI for iPhone/iTouch's are? I sniffed my  
own iTouch requesting DHCP and the the only thing I see as a Client  
Identifier is the following:

Option Code: 61
Option Length: 7
Hardware Type: 1
Hardware Address: 00:25:4b:66:cc:54



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