From: Marvin Greenlee (marvingreenlee@yahoo.com)
Date: Tue Jan 13 2004 - 22:45:30 GMT-3
Cisco has support for NAT failover as of 12.2(13)T.
However, this requires two routers, and depending on
where the failure occurs, may not work in your
situation.
Reference - Cisco - NAT Stateful Failover of Network
Address Translation -
http://www.cisco.com/en/US/products/sw/iosswrel/ps1839/products_feature_guide09186a00801124ad.html
Sincerely,
Marvin Greenlee, CCIE #12237
Network Learning, Inc.
Senior Technical Advisor
marvin@eccie.com
> > >From: "Andrew Moriarty"
> <amgroupstudy@hotmail.com>
> > >Reply-To: "Andrew Moriarty"
> <amgroupstudy@hotmail.com>
> > >To: ccielab@groupstudy.com
> > >Subject: OT:Fault tolerant CEO's home network
> setup.
> > >Date: Wed, 07 Jan 2004 00:53:20 -0500
> > >
> > >Ever have the feeling that you are missing
> something incredibly basic
> that
> > >will make you look stupid later? I do right now,
> and I hope someone can
> > >help.
> > >
> > >The scenario: The customers CEO often works from
> home. He accesess
> company
> > >servers in california, and he lives in Canada.
> Because of where he
> lives,
> > >all he can get at his house is a relatively basic
> DSL from one provider,
> > >and a basic cable modem setup from another. Both
> of these are "Home user"
> > >type setups, with addresess assigned by DHCP. The
> DSL provider is
> > >frequently down for a day or more. Problem is,
> thats the high speed
> > >connection! The cable in this area is much
> slower, and not much more
> > >reliable. (Don't ask me to explain why this so-
> it just is!- and before
> > >anyone makes any canada jokes, yes he can get a
> canoe at the local
> > >supermarket, all the TV netoworks carry hockey,
> and yes, there are wild
> elk
> > >running around in the parking lot)
> > >
> > >The CEO has a relatively robust home network- a
> unix based firewall, and
> a
> > >half dozen computers behind it.
> > >
> > >His goal is to have seemless fail-over, for as
> cheap as possilbe. He
> wants
> > >to be connected in to a contact management system
> all day long, and not
> > >worry about which ISP is up or down. In other
> words, he might buy a
> router
> > >or two, but he won't upgrade his personal "Home"
> service to a business
> > >class service. (its not available in that area
> anyways)
> > >
> > >Each ISP provides him with a public IP address.
> Right now he only uses
> one
> > >of them, and uses NAT on his unix firewall to
> provide internet access for
> > >his six machines. He wants to add the second ISP
> to the configuration, to
> > >povide fault tolerance.
> > >
> > >I've suggested buying a router and connecting it
> to both ISP's, and using
> > >one interface as the primary and one as the
> backup, with static routes
> and
> > >NAT.Cheap, simple solution. Problem is, if one
> ISP fails, there goes his
> > >public address that the NAT is using, and he'll
> have to log out of his
> > >contact managment software, and restart his
> session, potentially loosing
> > >data. He does NOT want to do that. Its no good
> flipping over to the
> second
> > >ISP/NAT connection, because then his public
> address will change, and his
> > >session will be invalid and have to start again.
> > >
> > >He doesn't have any public ip addresses inside
> his house, can't get any
> > >either with the services on offer in that area.
> He's not going to do
> > >anything complex like run BGP etc. The ISP's
> won't let him anyways.
> > >
> > >I'm not sure I can solve his problem, but I've
> got a tickle in the back
> of
> > >my mind about something, thinkingI saw this
> somewhere before. I even got
> > >out my Halabi and Doyle books and re-read some
> stuff.
> > >
> > >Does anyone have any suggestions on what to do
> here? Or even something to
> > >research.....
> > >
> > >am
> > >
> >
>
>_________________________________________________________________
> > >The new MSN 8: smart spam protection and 2 months
> FREE*
> > >http://join.msn.com/?page=features/junkmail
> >
>
>http://join.msn.com/?page=dept/bcomm&pgmarket=en-ca&RU=http%3a%2f%2fjoin.ms
>
n.com%2f%3fpage%3dmisc%2fspecialoffers%26pgmarket%3den-ca
> > >
> >
>
>_______________________________________________________________________
> > >Please help support GroupStudy by purchasing your
> study materials from:
> > >http://shop.groupstudy.com
> > >
> > >Subscription information may be found at:
> > >http://www.groupstudy.com/list/CCIELab.html
> >
> >
>
This archive was generated by hypermail 2.1.4 : Mon Feb 02 2004 - 09:07:44 GMT-3