dhcp option 226 and 227

Glenn Satchell Glenn.Satchell at uniq.com.au
Tue Mar 31 13:01:41 UTC 2009

Hi Dwayne

What sort of device is the client? There's a lot of experience on this
list - someone may know... In fact I bet someone can tell just from
knowing the option numbers.

Aha, looks like an Avaya phone thingy? I saw the post with the array of
integer here. There's a lot of duplication in his config (eg setting
the option variables in the subnet, and the host scope).


I also found this, and it says both options 226 and 227 are an ip address.


However, 4 x 8 bit integers get stored the same way as an ip address
(32 bit integer), so either "should" work, although using a type of
ip-address is "more correct" I feel.

In dhcp 3 and 4 you can give arbitrary names to options too, eg:

option avaya-server code 226 = ip-address;
option avaya-syslog code 227 = ip-address;

option avaya-server =;
option avaya-syslog =;



>Date: Tue, 31 Mar 2009 08:02:38 -0400
>From: dhottinger at harrisonburg.k12.va.us
>Unfortunately it isnt spelled out in the documentation.
>Quoting Glenn Satchell <Glenn.Satchell at uniq.com.au>:
>>> Date: Mon, 30 Mar 2009 18:43:10 -0400
>>> From: dhottinger at harrisonburg.k12.va.us
>>> To: dhcp-users at lists.isc.org
>>> Subject: dhcp option 226 and 227
>>> Im trying to figure out how to add options 226 and 227 to my dhcp
>>> server.  I have not
>>> been able to find much about this through google.  Has anyone
>>> implemented these options
>>> for their dhcp server?  I added the following to my dhcpd.conf (main file)
>>> option option-226 code 226 = array of integer 8;
>>> option option-227 code 227 = ip-address;
>>>         option option-226               10,40,0,29;
>>>         option option-227     ;
>>> Im not sure what the array of integer 8 is at all, but the only
>>> example I could find had
>>> that in the main options area.
>>> thanks,
>>> ddh
>> Hi Dwayne
>> See the dhcp-options man page, in particular the section titled
>> "DEFINING NEW OPTIONS" for the syntax. The values and types you use
>> will depend on what the client is expecting. This should be spelled out
>> by the client documentation.
>> regards,
>> -glenn
>> _______________________________________________
>> dhcp-users mailing list
>> dhcp-users at lists.isc.org
>> https://lists.isc.org/mailman/listinfo/dhcp-users
>Dwayne Hottinger
>Network Administrator
>Harrisonburg City Public Schools
>"Everything should be made as simple as possible, but not simpler."
>-- Albert Einstein
>"The hottest places in Hell are reserved for those who, in times of moral
>crisis, preserved their neutrality."
>-- Dante
>dhcp-users mailing list
>dhcp-users at lists.isc.org

More information about the dhcp-users mailing list