RE: NAT with redundancy

Anbu,

If the router is a 3640 or 2600 then you can configure SLB on the router.
Here is the configuration guide for doing it
http://www.cisco.com/en/US/docs/ios/12_1t/12_1t5/feature/guide/iosslb5t.html

It is pretty simplistic.

ip slb serverfarm SERVERS
 predictor roundrobin
 real <server-one>
  inservice
  faildectect numconns 10
 real <server-two>
  inservice
  faildectect numconns 10
!
ip slb virtual APP1
 virtual <public-ip> <app-port>
 serverfarm SERVERS
  inservice

Something like that is very simple to configure and more robust. I would go
with the above if possible before NAT.

Regards,
 
Tyson Scott - CCIE #13513 R&S, Security, and SP
Managing Partner / Sr. Instructor - IPexpert, Inc.
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-----Original Message-----
From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
Narbik Kocharians
Sent: Tuesday, June 01, 2010 7:05 PM
To: David Bass
Cc: Ryan West; Anbu; Joseph L. Brunner; Cisco certification
Subject: Re: NAT with redundancy

Anbu,

David's recommendation is a pretty good one, but you can do NAT / Redundancy
using HSRP, if you need a lab Unicast me and i will send you one.

On Tue, Jun 1, 2010 at 2:03 PM, David Bass <davidbass570_at_gmail.com> wrote:

> What you really want to do is load balancing or clustering. NAT is not
the
> correct mechanism for this, and you would be better off doing Windows
> clustering (assuming it's a windows box), or some other form of cluster
> server app. That's if you don't have a LB type device.
>
> As a last resort you could do EEM...
>
> On Mon, May 31, 2010 at 11:27 AM, Ryan West <rwest_at_zyedge.com> wrote:
>
> > Anbu,
> >
> > > -----Original Message-----
> > > Sent: Monday, May 31, 2010 12:17 PM
> > > To: Joseph L. Brunner; Cisco certification
> > > Subject: Re: NAT with redundancy
> > >
> > > Thanks Joe ,
> > >
> > > i have some more to get understand regard this and expect your help ,
> > >
> > > My exact requirement is, in your example the outside global
> > (12.207.43.148)
> > > should translate to 192.168.1.50 . if 192.168.1.50 is not available
> only
> > it should
> > > be translated to 192.168.1.52.
> > >
> > > So is there any method to do the NAT with IP SLA to check 192.168.1.50
> is
> > up
> > > / down , then if it is down it want to translate to 192.168.1.52.
> > >
> >
> > I don't think this is possible with NAT by default. You could write an
> > EEM script to do that though, track the state of your IP SLA and trigger
> the
> > proper CLI commands.
> >
> > -ryan
> >
> >
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> >
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>

-- 
Narbik Kocharians
CCSI#30832, CCIE# 12410 (R&S, SP, Security)
www.MicronicsTraining.com
Sr. Technical Instructor
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