What about this:
http://www.cisco.com/warp/public/cc/cisco/mkt/ios/nat/tech/emios_wp.htm
Multihoming with NAT....A good read.
Kenny
----- Original Message -----
From: "Andy Harding" <[EMAIL PROTECTED]>
To: "Daniel Ji" <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
Sent: Sunday, June 04, 2000 6:30 PM
Subject: Re: How to make redundancy using BGP?
> I work for a european ISP as a network engineer and get this kind of cr*p
> all the time
>
> If you are SERIOUS about redundancy the go get an AS# and some PI
(Provider
> Independant) space from ARIN, etc - multi-home with two ISPs, take a full
> routing table, advertise your own routes, AS#, etc. ie take a transit
> agreement (as opposed to a peering agreement which is something else
> entirely)
>
> There is no way in the world that two providers are going to sync up
private
> AS #s - in fact they couldn't do it as it would mean they would both be
> advertising the same address space as a part of their native AS# which you
> know can't be done.
>
> I'm a little hazy about DNS/bind but if you must have two PA (Provider
> Aggregate) address spaces from two providers then I believe that you can
> equally weight the two entries to resolve out alternately, although this
is
> potentially a nightmare from the tracerouting/symetrical routing
standpoint
> as DNS may well reolve ut differently each time. (not entirely sure about
> this one - quite happy to be shot down if someone can out me straight)
>
> HTH
>
> Andy
> ----- Original Message -----
> From: Eric Lam <[EMAIL PROTECTED]>
> Newsgroups: groupstudy.cisco
> To: <[EMAIL PROTECTED]>
> Sent: Thursday, June 01, 2000 4:09 AM
> Subject: Re: How to make redundancy using BGP?
>
>
> > Hi Daniel,
> >
> > There are two way to do it:
> >
> > 1. the two ISP to agree on assign you a private BGP no. (I remember it
> > should be 65xxx, could someone let me know) and run BGP. Info. as
follow:
> > http://www.cisco.com/warp/public/cc/cisco/mkt/ios/nat/tech/emios_wp.htm
> >
> > 2. using route-map to map diff. next-hop address to diff. NAT pool.
This
> > should work fine except I have problem with the icmp message (can't ping
> > from inside to outside).
> >
> > Good luck, Eric
> >
> > "Daniel Ji" <[EMAIL PROTECTED]> wrote in message
> > 8h4ebg$549$[EMAIL PROTECTED]">news:8h4ebg$549$[EMAIL PROTECTED]...
> > > The following problem has obsessed me a long time:
> > >
> > > Our company has two ISPs, thus we have two links to internet, and each
> one
> > > assign their own IP blocks to us. now we want to have redundancy so
when
> > one
> > > link is down, we can use another link for a mission-critical server to
> > > continue to run.
> > >
> > > my question is:
> > > 1)Do we have to have our own Internic assigned AS number so we could
> run
> > > BGP to "advertise" to the Internet that we have more than one route to
> the
> > > Internet?
> > >
> > > 2)Can we use an IP address assigned from our ISPs or Do we have to
have
> > our
> > > own IP in order to meet the requirement?
> > >
> > > Any help greatly appretiated!
> > > Thanks in advance
> > > Daniel
> > > CCNA
> > >
> > >
> > >
> > > ___________________________________
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> >
> >
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>
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