[c-nsp] DHCP Proxy

Peter Rathlev peter at rathlev.dk
Tue Jan 20 04:56:42 EST 2015

On Tue, 2015-01-20 at 09:06 +0100, Peter Rathlev wrote:
> On Tue, 2015-01-20 at 10:09 +0530, Ambedkar wrote:
> > I want to send the Proxy settings includes IP address, port number through
> > DHCP in cisco routers and switches.
> > 
> > Is it possible to send ?
> > If yes, How ??
> Can you be a bit more precise? Do you want to forward DHCP requests on a
> non standard port, i.e. not 67/UDP? [...]

Sorry, misread your question. :-) Joshua seems to have it right.

According to Microsoft Technet:


the option 252 is a string in the format:


Configuration like this could thus work:

  ip dhcp pool
    [ other options and parameters ]
    option 252 ascii ""

Beware that some clients aren't asking for option 252 during the DORA
sequence and instead sends INFORMs some time after, as this message
seems to imply:


As far as I know, in IOS you can't send options the client isn't asking
for in the REQUEST. (That is: You can't modifWhich means your clients
might not pick up the WPAD option at all.


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