From: Afzal Khattak (khattak309@hotmail.com)
Date: Fri Jul 07 2006 - 10:27:25 ART
Please remove my email address from the subscription list.
Thanks
Afzal
----- Original Message -----
From: "blodwick" <blodwick@columbus.rr.com>
To: "'Godswill Oletu'" <oletu@inbox.lv>; "'Daniel Ramirez'"
<daniel.ramirezdelamo@gmail.com>
Cc: <ccielab@groupstudy.com>
Sent: Friday, July 07, 2006 9:00 AM
Subject: RE: DHCP server excluded address
> Daniel,
> I'd also like to add to Godswill's response that since by default a
> Cisco router acting as a DHCP server will ping each address before
> leasing it out it will not lease out an HSRP virtual address because
> HSRP virtual addresses are pingable, but what about a VRRP virtual
> address?
>
> Also I thought this was interesting - did you know that with VRRP you
> can actually assign one of the router's physical interface addresses as
> the virtual address?
>
> Brian L.
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Godswill Oletu
> Sent: Friday, July 07, 2006 8:39 AM
> To: Daniel Ramirez
> Cc: ccielab@groupstudy.com
> Subject: Re: DHCP server excluded address
>
> Daniel,
>
> By default the DHCP server pings a pool address before assigning a
> particular ip address to a requesting client. If the ping is unanswered
> after 2 pings of 500ms timeouts each, the DHCP server assumes that the
> address is not in use & assigns it. You can change this default
> behaviour by
> configuring 'ip dhcp ping <packets | timeout>'
>
> The DHCP server assumes that all ip addresses in the pool subnet are
> available for assignment to clients, so configuring the exclude range is
> a
> good design practice to define what is available & what is unavailable.
> Since, you already know of some unavailable ip addresses, why not go
> ahead
> and let the dhcp server know about those unavailable ip addresses? It
> will
> helps to reduce the range of ip addresses, the dhcp sever have to check
> before assigning an ip address. Also, you will increase the chances of
> not
> getting a duplicate ip address.
>
> I really do not see it as an overconfiguration.
>
> Godswill Oletu
> CCIE #16464
>
>
> ----- Original Message -----
> From: "Daniel Ramirez" <daniel.ramirezdelamo@gmail.com>
> To: "Godswill Oletu" <oletu@inbox.lv>
> Cc: <ccielab@groupstudy.com>
> Sent: Friday, July 07, 2006 7:56 AM
> Subject: Re: DHCP server excluded address
>
>
> > Thanks for your reply.
> >
> > I know that excluding local IP address and virtual IP address It will
> > work. But I have checked that without configuring the command: "ip
> > dhcp excluded-address" it also works (that is, the router that acts as
> > dhcp server doesn't assign the local ip address or the hsrp virtual
> > ip). So I am not sure if I am overconfiguring the router if I
> > explicitly configure the excluded address.
> >
> > Regards
> > DRA
> >
> >
> > On 7/7/06, Godswill Oletu <oletu@inbox.lv> wrote:
> > > Daniel,
> > >
> > > Yes, exclude all used ip addresses including the virtual ip address
> of
> the
> > > HSRP.
> > >
> > > HTH
> > >
> > > Godswill Oletu
> > > CCIE #16464
> > >
> > >
> > > ----- Original Message -----
> > > From: "Daniel Ramirez" <daniel.ramirezdelamo@gmail.com>
> > > To: <ccielab@groupstudy.com>
> > > Sent: Friday, July 07, 2006 3:05 AM
> > > Subject: DHCP server excluded address
> > >
> > >
> > > > Hi,
> > > >
> > > > When configuring dhcp server, is it necessary to excluded the
> local
> > > > address of the router from the avalaible address pool?. Also, when
> > > > configuring both HSRP and DHCP server feature in the same router,
> I
> > > > assume that it is necessary to excluded also the HSRP virtual ip,
> is
> > > > it rigth ?
> > > >
> > > > Best Regards,
> > > > DRA
> > > >
> > > >
> _______________________________________________________________________
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