Multiple Entries in Option 15 (Domain Name)

Glenn Satchell glenn.satchell at
Fri Feb 5 12:25:31 UTC 2010

Ansar Mohammed wrote:
> Greetings and Salutations All,
> can i have multiple entries in option 15 (Domain Name) or is this 
> non-RFC compliant?
> I am asking this because I am reviewing someone else's config file and 
> Option 15 is set with multiple names in the format
> */"" <>", " <>""/*

*Some* clients may interpret the option that way, but it is not 
guaranteed behaviour, and I do not think it is RFC compliant.

A later RFC introduced the domain-search option which does exactly what 
you want:

      option domain-search domain-list;

        The domain-search option  specifies  a  'search  list'  of
        Domain  Names  to  be  used  by  the client to locate not-
        fully-qualified domain names.  The difference between this
        option  and historic use of the domain-name option for the
        same ends is  that  this  option  is  encoded  in  RFC1035
        compressed labels on the wire.  For example:

          option domain-search "", "",

Glenn Satchell                            |  Miss 9: What do you
Uniq Advances Pty Ltd, Sydney Australia   |  do at work Dad?
mailto:glenn.satchell at         |  Miss 6: He just tel:0409-458-580   |  types random stuff.

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