John,
There might be ways to get this done other than BGP...
http://www.cisco.com/warp/public/cc/pd/iosw/ioft/ionetn/tech/emios_wp.htm
Take a look at the multi-homing with NAT. I do see some possible problems -
with DNS and how your hosts are resolved. You could have a server hosted
elsewhere which points/re-directs traffic via either ISP via the 2 different
links depending on which one is available or load-balance between the 2.
Regards,
Adrian
"John Neiberger" <[EMAIL PROTECTED]> wrote in message
31767142.971447738012.JavaMail.imail@tiptoe">news:31767142.971447738012.JavaMail.imail@tiptoe...
> 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
> advertise subnets smaller than a /18. If that's the case, our plan is in
> trouble.
>
> 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?
>
> 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?
>
> Thanks, as usual...
> John Neiberger
>
>
>
>
>
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