Here are some experiences learned. This is what you do. Write up a request
for 1 of the ISPs requesting a /24 block(you can fill in anything here to
justify it and if you don't get it the first time try again ...). Tell both
ISPs that you want to advertise your new block. Obtain an AS from ARIN. DO
NOT USE VERIZON. Their NOC know about BGP as much a child. If you must use
them call their BGP team directly. You have to remember one thing when
dealing with these ISPs. If you can't get 1 engineer to do it for you, keep
calling and asking to talk to others. UUNet was very good about things. I've
spent 4 days on the phone with verizon and talked to 5 engineers, 1 manager,
and 2 specialist in the BGP team before I got my /24 advertised. There are a
lot of engineers who have no idea how BGP works, so you have to be
persistent when dealing with the lower level support. Remember to lie a
little if you have to.
-----Original Message-----
From: John Neiberger [mailto:[EMAIL PROTECTED]]
Sent: Friday, October 13, 2000 10:36 AM
To: [EMAIL PROTECTED]
Subject: BGP, Multihoming, and Me
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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