Zhasper wrote:
On 3/9/06, O Plameras <[EMAIL PROTECTED]> wrote:
This is solved by running BGP routing in your linux router. BGP will
handle this
gracefully and automatically. There is GPL BGP in Linux (www.zebra.org) or
(www.quagga.net). There is one requirement. Your Company must be an
Autonomous System.
This has to be the most expensive and complex "simple" solution I've
seen in a long time.
Some requirements on howto become Autonomous System.
1. You must owned at least some C class public IP number. If you have
none apply and
get some from APNIC.
Last time I checked, APNIC don't issue anything smaller than about a
/22, and they demand very, good justification for why you need so many
IPs and can't use NAT, name-based vhosting, etc.
You're not going to get this for anything less than a medium--size ISP
or hosting business - certainly not for a SOHO connection
2. Apply for AS Number from APNIC.
Last time I went through this process, it took several months for
approval, and required joining APNIC first. IIRC, that was in the
vicinity of US$1000 - again, not exactly suitable for a SOHO
Again, you need to show good cause why you need your own AS - having
your own portable /24 or bigger, and having that netblock multihomed,
will be sufficient reason though.
3. Talk to your ISPs for set up. (Your ISP must also be AS).
Also, you'll have to get a router with enough RAM to hold the global
BGP table, or have an arrangment with both your ISPs to have them only
forward you a section of the table.
Oh yes, you'll need to discuss this with both your ISPs in advance as
well - again, they will probably only even think about doing this kind
of setup for you if you're a large customer - it's annoyingly complex
to set up, and very non-standard, so a high maintenance cost as well.
Lets not talk about the overhead of keeping the tables in sync on a
small connection either...
Lastly - the global BGP table is already polluted enough because
Telstra don't know how to aggregate their blocks. If every man and his
dog started getting their own AS just to try to have a few less
outages on their ADSL connections...
dammit, it's 8:34 already and my lift is here, have to run :(
--
There is nothing more worthy of contempt than a man who quotes himself
- Zhasper, 2005
Yeah, it cost something like $1,500. If you're a medium size company
this is insignificant
cost to compared to pay for a Linux Consultant patching software here
and there.
How much do you pay for a Linux Consultant ? At least $60/hour and
Consultants
turns-around. Every time there is a turn-around someone has to learn
what had been
done. This is a problem because different Consultants have different
ideas whereas BGP is
widely known; the methods and procedures do not change. Another way of
looking at
this is even when in-house IT staff does the job, then think how much
time could be
freed up for other things instead of spending time forever on something
that could be
done automatically. It's the long-term cost that matters not the
one-time cost.
Mocking around with patches here and there will cumulativelty cost money
in terms of Consultant time.
The $1,500 or so is a one time cost compared with cost to cover Linux
Consultant or IT personnel time
on an on-going basis.
Memory on Linux is tremendously less than that on a Cisco Router. I
believe Linux
memory is a seventy-five percent less than it cost Cisco Memory last
time I compared.
Set up is a breeze, once you know how. It takes about a few minutes for
the router to learn IP routes,
these days because bandwidth is no longer a rare commodity. But again
this happens only once
when you re-start your router.
Last time I applied for AS Number, 24 hours was the turn-aound. If it
takes longer than that your
uplink ISP can always lend you a hand by allowing you the use of their
AS Number.
I can also reveal a little trick. You can use unregistered(something you
make up) AS Number
inside your network provide you do not propagate this outside your network.
O Plameras
--
The only true wisdom is in knowing you know nothing - Socrates
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