On Fri, 13 Oct 2000, John Neiberger wrote:
> I have a question that I'm sure has been referenced before but I couldn't
> find an answer in the archives, and it's more practical than technical.
>
> We have a single T-1 connection to an ISP for customer access to our
> internal webservers so that our banking customers can do web-based
> transactions and get account information. This is such an important aspect
> of our business that we decided to get a second T-1 to another ISP for
> redundancy. We aren't as concerned with being able to load-balance, which
> is a dicey prospect in this arrangement anyway.
>
> Now, the problem: we have a tiny subnet assigned to us from ISP-1, it's a
> /27. Now let's say we get a connection to ISP-2 and we start running BGP.
> Is ISP-2 probably going to have a problem letting us advertise such a small
> set of routes? I've been hearing that big ISPs tend not to want to
most definitly.........it would be hard to get them to do it, and everyone
is going to filter a /27 announcement, if someone leaked a /27 into the
global table, they would get jumped on fast :)
> advertise subnets smaller than a /18. If that's the case, our plan is in
> trouble.
thats a bunch of BS for the most part. their are plenty of /24's being
announced just fine, with lots of connectivity........the few sticklers
out there generally are even more liberal than the /18.....more like /20,
/21....
>
> Now, problem #2: even if we can advertise a /27 through ISP-2, ISP-1 is
> going to have to agree to advertise our /27 along with their aggregate
> advertisement. If they don't, and they only advertise their aggregate, this
> will cause return traffic to our network to come through ISP-2 because it
> will be advertising a more specific route, correct? If that's correct, do
> ISPs tend to have a problem with this arrangement?
you are going to have problems with a /27. You could run multiple
redundant local loops to a single ISP that is multi-homed real well.
>
> Basically, are we setting ourselves up for disappointment? Are there any
> other factors that I should be aware of that I'm not considering? Should I
> become a yak herder and move to Nepal?
You have some options. How large is your company? Could they possibly
justify a larger block assignment from either ARIN or the ISP?
Brian
>
> Thanks, as usual...
> John Neiberger
>
>
>
>
>
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-----------------------------------------------
Brian Feeny, CCNP, CCDP [EMAIL PROTECTED]
Network Administrator
ShreveNet Inc. (ASN 11881)
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