From: Graham Hopkins (ghopkins@wolf-rock.co.uk)
Date: Mon Aug 29 2005 - 11:03:17 GMT-3
Did you test failover? When I tested with XP although it took 2 default
gateways the routing table had two entries to 0.0.0.0 and always took the
gateway with the lowest IP address. When that failed routing stopped
example
R5 172.16.30.5
R1 172.16.30.1
R5 is the DHCP server and has
default-router 172.16.30.5 172.16.30.1
on the XP PC ipconfig show default gateway as
172.16.30.5
172.16.30.1
route print show
0.0.0.0 via 172.16.30.1
0.0.0.0 via 172.16.30.5
and 172.16.30.5 as the default gateway
If you fail .5 which appears to be the first choice default gateway R1 takes
over, but sniffer shows that traffic is going via 172.16.30.1 all the time.
Fail .1 and .5 doesn't takeover.
Graham Hopkins
----- Original Message -----
From: "Rodolphe Abou Nassar" <rabounassar@dataconsult.com.lb>
To: "Mitchell, TJ" <tmitchell@allianttech.com>; "Hictor Fernandez"
<gnakh@telefonica.net>; "Brant I. Stevens" <branto@branto.com>;
<ccielab@groupstudy.com>
Sent: Monday, August 29, 2005 10:08 AM
Subject: RE: Does the default-router command provide redundancy?
> The doc CD doesn't clearly mention whether this method works dynamically,
> and
> on which platforms (Windows. Linux, etc).
>
> I made the test in my lab, and it worked with windows XP: the client CAN
> take
> 2 default routers.
>
> In other words, you can use this method instead of HSRP/VRRP/GLBP (with
> limitations offcourse)
>
>
>
> Thank you for your support.
>
>
>
> Rudi
>
>
>
>
>
> ________________________________
>
> From: Mitchell, TJ [mailto:tmitchell@allianttech.com]
> Sent: Thursday, August 25, 2005 5:56 PM
> To: Rodolphe Abou Nassar; Hictor Fernandez; Brant I. Stevens;
> ccielab@groupstudy.com
> Subject: RE: Does the default-router command provide redundancy?
>
>
>
> Taken directly from the Doc CD:
>
>
>
> default-router
>
> To specify the default router list for a Dynamic Host Configuration
> Protocol
> (DHCP) client, use the default-router command in DHCP pool configuration
> mode.
> To remove the default router list, use the no form of this command.
>
> default-router address [address2...address8]
>
> no default-router
>
> Syntax Description
>
> address
>
> Specifies the IP address of a router. One IP address is required, although
> you
> can specify up to eight addresses in one command line.
>
> address2...address8
>
> (Optional) Specifies up to eight addresses in the command line.
>
>
>
> Defaults
>
> No default behavior or values.
>
> Command Modes
>
> DHCP pool configuration
>
> Command History
>
> Release
>
> Modification
>
> 12.0(1)T
>
> This command was introduced.
>
>
>
> Usage Guidelines
>
> The IP address of the router should be on the same subnet as the client
> subnet. You can specify up to eight routers in the list. Routers are
> listed in
> order of preference (address1 is the most preferred router, address2 is
> the
> next most preferred router, and so on).
>
> Examples
>
> The following example specifies 10.12.1.99 as the IP address of the
> default
> router:
>
> default-router 10.12.1.99
>
>
>
>
>
> This leads me to believe that it should work that way, please anyone let
> me
> know if I'm reading this incorrectly.
>
>
>
> Thanks
>
>
>
> T.J. Mitchell
>
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Rodolphe Abou Nassar
> Sent: Thursday, August 25, 2005 9:32 AM
> To: Hictor Fernandez; Brant I. Stevens; ccielab@groupstudy.com
> Subject: RE: Does the default-router command provide redundancy?
>
>
>
> Thanks Brant and Hector
>
> Let's say that you are forbidden to use any of these dynamic methods, does
> the
> default-router command do the job?
>
> Rgds,
>
> Rudi
>
>
>
>
>
> -----Original Message-----
>
> From: Hictor Fernandez [mailto:gnakh@telefonica.net]
>
> Sent: Thursday, August 25, 2005 12:55 AM
>
> To: Brant I. Stevens; Rodolphe Abou Nassar; ccielab@groupstudy.com
>
> Subject: Re: Does the default-router command provide redundancy?
>
>
>
> Hi,
>
>
>
> I think behavior of an IP maching having two default gateways depends on
> its
>
> implementation.
>
> I wouldn't load two default gateways to a PC... Instead, Brant hit the
>
> point... serve one gateway and look for whatever mechanism to make that
>
> gateway redundant, like HSRP, GLBP, VRRP, etc...
>
>
>
> Take care
>
>
>
> Hictor
>
>
>
> ----- Original Message -----
>
> From: "Brant I. Stevens" <branto@branto.com>
>
> To: <rudi@dataconsult.com.lb>; <ccielab@groupstudy.com>
>
> Sent: Wednesday, August 24, 2005 11:32 PM
>
> Subject: Re: Does the default-router command provide redundancy?
>
>
>
>
>
>> It looks like it is part of the IOS DHCP server scope/pool configuration.
>
>> This is the DHCP client's default gateway, usually serviced by an HSRP
>
>> virtual address.
>
>>
>
>>
>
>>
>
>> On 8/24/05 10:09 AM, "rudi@dataconsult.com.lb" <rudi@dataconsult.com.lb>
>
>> wrote:
>
>>
>
>> > Hi,
>
>> > Does the default-router command provide redundancy?
>
>> > As posted on the Doc:
>
>> >
>
> http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123cgcr/ipras
> _
>
>> > r/ip1_d1g.htm#wp1078499
>
>> > There is no clear indication whether this command provides redundancy
>
> (ie, if
>
>> > Gateway 1 fails, Gateway 2 takes over dynamically).
>
>> > Then my question is:
>
>> > What is the use of several arguments in this command?
>
>> > Hope i was clear.
>
>> > Thanks in advance.
>
>> >
>
>> > _______________________________________________________________________
>
>> > Subscription information may be found at:
>
>> > http://www.groupstudy.com/list/CCIELab.html
>
>>
>
>> _______________________________________________________________________
>
>> Subscription information may be found at:
>
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>
>
>
> _______________________________________________________________________
>
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>
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>
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