RE: DHCP Server - Default-router List

By default clients will select the first address as their default gateway.
You can also selectively assign metrics to default routers on clients to
have some choose one and others choose the other. Not a real scalable
design.

Regards,
 
Tyson Scott - CCIE #13513 R&S, Security, and SP
Managing Partner / Sr. Instructor - IPexpert, Inc.
Mailto: tscott_at_ipexpert.com

-----Original Message-----
From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of Tom
Kacprzynski
Sent: Friday, November 19, 2010 4:16 PM
To: Mahaffey, Brian
Cc: Cisco certification
Subject: Re: DHCP Server - Default-router List

Brain,
Thank you for your response. I'm trying to figure out what is the feature
for in the DHCP server. How could a DHCP server give out up to 8 IP
addresses that can be used as a default route. Yes HSRP would work great to
provide first hop redundancy, but why would cisco provide the option of
giving out 8 IP addresses if the client will take the first address. As far
as i could see, yes it does take the first one, even if that first one is
not reachable, so no arp or icmp ping for it from the client.

Regards,

Tom

On Fri, Nov 19, 2010 at 3:09 PM, Mahaffey, Brian <bmahaffey_at_pelco.com>wrote:

> Have you looked into HSRP and just giving the clients one default
> router? I would assume the client would accept the first one it
> receives, but I am just guessing.
>
> -----Original Message-----
> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
> Tom Kacprzynski
> Sent: Friday, November 19, 2010 12:50 PM
> To: Cisco certification
> Subject: Re: DHCP Server - Default-router List
>
> Anyone, please? I'm stuck.
>
> thanks
>
>
> On Thu, Nov 18, 2010 at 7:21 PM, Tom Kacprzynski <tom.kac_at_gmail.com>
> wrote:
>
> > Hello,
> > Just a quick question regarding IOS DHCP server and the default-router
> > list.
> >
> > If I have a pool that specifies multiple default routers, but what I
> don't
> > understand is how does the client pick one of the other?
> >
> > Sample config below.
> >
> > Rack1R1#sh run | s pool
> > ip dhcp pool TEST
> > network 155.1.146.0 255.255.255.0
> > default-router 155.1.146.10 155.1.146.1
> > dns-server 155.1.146.1
> >
> > Based on this the client takes the first IP address for default
> router,
> > even if that router is not reachable it does not failover.
> >
> > Does anyone know how you could use the two IP addresses and how does
> the
> > client switch between them?
> >
> > Thank you,
> >
> > Tom Kacprzynski
>
>
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Received on Fri Nov 19 2010 - 16:29:57 ART