RE: wanted: wireless magic tricks
cheap/fast/good. Pick two. I don't know that you can get that kind of speed from satellite. If you could get that kind of range from point-to-point wireless at that speed, you'd certainly need a good line of sight. Do you have that? You should see if this data is reasonably compressible. Maybe your bandwidth needs aren't as bad as you think. Jason Young CNS - Network Design, Anheuser-Busch (314)577-4597
-----Original Message----- From: Cerqua, Toby [mailto:toby@platinumsystems.net] Sent: Thursday, August 16, 2001 11:02 AM To: 'nanog@merit.edu' Subject: wanted: wireless magic tricks
hey all,
we've got a client that wants some crazy stuff, and i need either suggestions or confirmation that this is impossible/too expensive.
client needs 45Mbps pushed over 20 miles... and he wants it wireless. the kicker is that they don't want a T3 because it is "too expensive" and it would take too long to get installed. it doesn't need to be constant, but he wants to move of 2.5GB within 45 minutes. this is in the chicago area, if that helps any. so, i don't know, satellite?
- toby ----------------------------------------------- t@platinumsystems.net http://www.platinumsystems.net
Sattelite would do it. We had a 45Mb on a HSSI interface here and uesd to work great, using a 9m diameter antenna. Now, the only thing would be the cost for that... Persio Pucci Analista Internetworking - Sao Paulo Impsat Comunicacoes Ltda. Tel: (55-11) 3444-6205 Fax: (55-11) 3444-6351 email: ppucci@impsat.net.br ----- Original Message ----- From: "Young, Jason" <Jason.Young@anheuser-busch.com> To: "'Cerqua, Toby'" <toby@platinumsystems.net>; <nanog@merit.edu> Sent: Thursday, August 16, 2001 1:13 PM Subject: RE: wanted: wireless magic tricks
cheap/fast/good. Pick two.
I don't know that you can get that kind of speed from satellite. If you
could
get that kind of range from point-to-point wireless at that speed, you'd certainly need a good line of sight. Do you have that?
You should see if this data is reasonably compressible. Maybe your bandwidth needs aren't as bad as you think.
Jason Young CNS - Network Design, Anheuser-Busch (314)577-4597
-----Original Message----- From: Cerqua, Toby [mailto:toby@platinumsystems.net] Sent: Thursday, August 16, 2001 11:02 AM To: 'nanog@merit.edu' Subject: wanted: wireless magic tricks
hey all,
we've got a client that wants some crazy stuff, and i need either suggestions or confirmation that this is impossible/too expensive.
client needs 45Mbps pushed over 20 miles... and he wants it wireless. the kicker is that they don't want a T3 because it is "too expensive" and it would take too long to get installed. it doesn't need to be constant, but he wants to move of 2.5GB within 45 minutes. this is in the chicago area, if that helps any. so, i don't know, satellite?
- toby ----------------------------------------------- t@platinumsystems.net http://www.platinumsystems.net
On Thu, Aug 16, 2001 at 11:13:24AM -0500, Young, Jason wrote: [..]
I don't know that you can get that kind of speed from satellite. [..]
Sure you can. Provided you have the $. Or you can IMUX sat T1s's to approximate whatever speed you really need. Catch is, the bw x delay product will kill you on these links if you run TCP sessions and you won't get anywhere near line rate. There's a company in Boulder which used to make a widget for high speed data transfer across sat link exactly for this purpose. Can't remember the name, should be able to find them easily though if they're still in business as it has been a few years since I last touched this stuff... -- Christian Kuhtz <ck@arch.bellsouth.net> -wk, <ck@gnu.org> -hm Sr. Architect, Engineering & Architecture, BellSouth.net, Atlanta, GA, U.S. "I speak for myself only."
What you'll need to correct that is a way to increase the TCP window size of the hosts, thus reducing the time spent waiting for ACKs to be returned. -C
Catch is, the bw x delay product will kill you on these links if you run TCP sessions and you won't get anywhere near line rate. There's a company in Boulder which used to make a widget for high speed data transfer across sat link exactly for this purpose. Can't remember the name, should be able to find them easily though if they're still in business as it has been a few years since I last touched this stuff...
-- Christian Kuhtz <ck@arch.bellsouth.net> -wk, <ck@gnu.org> -hm Sr. Architect, Engineering & Architecture, BellSouth.net, Atlanta, GA, U.S. "I speak for myself only."
-- --------------------------- Christopher A. Woodfield rekoil@semihuman.com PGP Public Key: http://pgp.mit.edu:11371/pks/lookup?op=get&search=0xB887618B
Date: Thu, 16 Aug 2001 12:23:55 -0400 From: Christian Kuhtz <ck@arch.bellsouth.net>
[ snip ]
Catch is, the bw x delay product will kill you on these links if you run TCP sessions and you won't get anywhere near line rate.
[ snip ] Set TCP window size to about 1x to 2x bw*delay. The value will be a bit large for a "normal" server (can you say "mbuf exhaustion"?), but I ass-u-me that the OP's client needs a few fast streams, not a few fast streams and tons of slow ones. How many simultaneous TCP connections on what boxen? Eddy --------------------------------------------------------------------------- Brotsman & Dreger, Inc. - EverQuick Internet Division Phone: +1 (316) 794-8922 Wichita/(Inter)national Phone: +1 (785) 865-5885 Lawrence ---------------------------------------------------------------------------
participants (5)
-
BRA-SAO-Pucci,Persio -
Christian Kuhtz -
Christopher A. Woodfield -
E.B. Dreger -
Young, Jason