The quick answer to both questions is "it depends."
What it will most depend on is how willing your ISPs are to work with you
in implementing multihoming, and their clue level about multihoming. I talk
about some aspects of this in the upcoming CertificationZone June CCIE
White Paper on BGP (2nd of a series).
>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?
Not necessarily. As an aside, Internic no longer issues AS numbers. Its
successor in the Americas is www.arin.net, in Europe www.ripe.net, and
www.apnic.net for the Pacific Rim.
If one provider is willing to advertise both its current supernet AND your
more-specific prefix, AND the other provider is willing to advertise a
piece of the other provider's space, AND the two providers will work with
each other, one solution is to use a private AS number coordinated with
both providers.
Look at RFCs 1998, 2260, and 2270.
>
>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?
You can use a provider assigned address, as long as all of your directly
connected peers agree and coordinate it.
>
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