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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