DHCP option 43 instance x

Unanswered Question
Jul 29th, 2010
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A client asked me to config different instances in dhcp.

He gave me the following config:

option 43 instance 3 ip
option 43 instance 4 hex 5060
option 43 instance 5 hex 5060
option 43 instance 7 hex 06
option 43 instance 8 hex 05
option 43 instance 19 ip
option 43 instance 20 hex 5060

"5060" in hex should be "13c4"

This config is being accepted without the instances but not with the "instance x" keyword.

hostname(dhcp-config)#option 43 hex 13c4

hostname(dhcp-config)#option 43 instance 3 ip
% Option 43, instance 3 is illegal. Zero is the only valid instance.

Could somebody be so kind to explain me if this is possible and how I should configure this?

Isn't this done by making one hex string?

Is it then possible to explain me how to make this string?



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fab5freddy Thu, 07/29/2010 - 13:54
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I almost forgot to say that this isn't a wireless but a voice question but as this a technique often used for

WLAN somebody suggested me to post this here.



Serge Yasmine Mon, 09/13/2010 - 23:44
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  • Cisco Employee,

Well if it helps you, here is how it is done in wireless:

option 43 hex f104c0a80101 where:

f104 is always preceding and indicates that there will be 1 ip address to follow and c0a80101 is the hex of


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