Option 43 and missing options

Ryan Gray ryantgray at gmail.com
Wed Sep 12 16:46:25 UTC 2018

Hi Peter,

So let me get this straight. You are suggesting I try doing it the right
way?!?  ;)

Agreed. Using concat, if nothing else, seems to be the documented method
for making this happen. Using concat also makes me want to drink.

Thanks for the links, too. I'm not sure how I missed those with all the
goog'ing I was doing for this. When I duplicate the desired behavior with
concat instead of with duct tape, I'll hit the list back with the config.

Thank you for your time.

Ryan Gray

On Wed, Sep 12, 2018 at 8:02 AM Peter Rathlev <peter at rathlev.dk> wrote:

> On Wed, 2018-09-12 at 07:19 -0500, Ryan Gray wrote:
> > I am sure that this works on the server. That is not because I found
> > it in the documentation, but just based on seeing it myself.
> Well something doesn't work, otherwise I assume you wouldn't have
> posted the first email. :-)
> My point was since I cannot find "append" anywhere in the man pages for
> current versions of the server, then maybe that's just not a supported
> thing and it could be wrecking havoc. A bug, yes, but only something
> that appears when configuring non-supported things.
> Searching the interwebs I found this:
>   https://lists.isc.org/pipermail/dhcp-users/2009-October/010456.html
> Almost exactly the same problem as yours: Using "append" to add option
> 15 makes options 1, 3 and 6 disappear. No answers to that one though.
> Also see this:
>   https://www.syslinux.org/archives/2003-January/001448.html
> Maybe "append" was a dhcpd 3.x thing?
> > When the "append dhcp-parameter-request-list" and the "option vendor-
> > encapsulated-options...." are included in the config block for that
> > subnet, 3, 6, and 28 are just not sent.    That was, until I added
> > the line "append dhcp-parameter-request-list 3", then one for 6 and
> > another for 28. I suspect these aren't the only options missing, but
> > the only ones I'm caring about today.
> >
> > I agree this behavior seems odd. That said, I have proven, at least
> > here, that these changes fix the issue. This seems like one of those
> > murky things that's going to manifest again during an upgrade or
> > other system change. :)
> My guess is that using the documented "concat" function will actually
> solve your problem of disappearing options. I'm guessing this since we
> use it that way and are not missing any options.
> --
> Peter
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> dhcp-users at lists.isc.org
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