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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