Greetings folks,
(It's been a long time 
I have some questions about multihoming that I can't seem to find by Google-ing for answers
1.) What ever happened to (Avi Freedman's?) Multihoming strategy using DNS(?),
there are links to archives circa 1997 but nothing recent.
2) What is the "preferred or correct" way for a relatively small outfit
(a small search engine) to implement Multihoming? Especially when most
of the machines are a VLS cluster so we are not talking about a large
address space here. It seems the outfit is having difficulty
getting blocks that they can even run BGP with, (I know I'm missing a lot here)
They can't even fill a /24, let alone anything greater
I am willing to take my answers off line. I'm sure there is a way to do this
that is so trivial to folks on this list that it's not talked about,
but since I haven't done this type of thing in about 5 years I am really out of the loop.
Thanks in advance and for all the great work over the years!
Cheers
Geoff White
Doesn't matter. Assuming we're talking about ARIN-region, if they're
multihomed, one of their providers can assign them a /24 (even if they'll
only use 2 IPs) so that they can announce that /24 to their other
providers and have a chance of not being route filtered. ARIN rules
specifically permit this, and it won't be held against the provider when
they apply for more space.
As long as they have a /24 that they can announce, two or more upstreams
that are able and willing to establish BGP sessions with them and a router
with enough memory to hold at least 2 full views (for a Cisco, you
probably want 256MB or more these days), they can multi (or dual) home.
I don't think Verio, Sprint or any other major ISP is filtering out /24s
from any part of IP4 any more.
I don't think there are many ISPs willing to establish BGP sessions for
customers that aren't spending at least T1 prices with them. Verizon is
going to be rolling out cheap, multimegabyte fiber connections to business
and residential customers around here soon. Since I'm paying ~$2k/mo for
2 T1s (with longish loops and a /21), it's tempting to see if I could get
ahold of somebody over there willing to talk about BGP
James Smallacombe PlantageNet, Inc. CEO and Janitor
up@3.am http://3.am
As long as they have a /24 that they can announce, two or more upstreams
that are able and willing to establish BGP sessions with them and a router
with enough memory to hold at least 2 full views (for a Cisco, you
probably want 256MB or more these days), they can multi (or dual) home.
They many not need anything near 2 full tables. A default plus providers own
and customer routes
could do, and would require less memory/smaller router.
James H. Edwards
Routing and Security Administrator
At the Santa Fe Office: Internet at Cyber Mesa
jamesh@cybermesa.com noc@cybermesa.com
http://www.cybermesa.com/ContactCM
(505) 795-7101