Multiple instances of custom option possible?

Reissom Beshir Reissom_Beshir at
Mon Aug 23 13:12:11 UTC 2010

man dhcp-options

       DHCPv6  options  differ  from  DHCPv4  options  partially  due to using 16-bit code and length tags, but semantically zero-length
       options are legal in DHCPv6, and multiple options are treated differently.  Whereas in DHCPv4 multiple options would be  concate-
       nated  to  form  one  option,  in DHCPv6 they are expected to be individual instantiations. 

So presumably you could have mutiple instance as follows ???

dhcp6.option-dns-select ip6-addr int8 "domain1"[,"domain2" ...]
dhcp6.option-dns-select ip6-addr int8 "domain10"[,"domain20" ...]

Reissom Beshir

----- Original Message ----- 
From: teemu.savolainen at 
To: dhcp-users at 
Sent: Wednesday, August 18, 2010 5:03 AM
Subject: Multiple instances of custom option possible?



I have tried to find answer to following problem but haven't succeeded. Could you please assist?


I'm working with prototype implementation relating to my draft:


I would like to have multiple instances of the proposed DHCPv6 option sent by ISC's DHCPv6 server implementation (4.2.0) and be received by the ISC's client (stateless mode). I get one instance through just fine, but is it possible to have several without modifying code?



option dhcp6.option-dns-select code xx = { ip6-address, integer 8, domain-list };


Thank you,




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