August 2001 - Test - lists.nanog.org

verizon atm outage
by deeann mikula 17 Aug '01

17 Aug '01

verizon techs are encountering problems with equiptment in the entire mid-atlantic region. ADSL outages are expected, and may last several hours each. they will be rolling outages, rather than blanketing the entire former BA territory at once. i didn't get a lot of details from the 5 different people in 3 different departments that i talked to, but it sounded gnarly and everyone was sounding very pessimistic. i gathered that there was some routine maintainance that turned into this widespread outage. they expect areas to be going up and down for "the entire weekend." one tech told me to advise my customers to reset their modems before attempting to connect again, but he couldn't explain to me what was going on. fun fun fun. anyone else hear a different story? deeann m.m. mikula director of operations telerama public access internet http://www.telerama.com 1.877.688.3200

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Re: Natural class B address
by smd＠clock.org 17 Aug '01

17 Aug '01

Sae writes: | Have question about filtering policy on the natural class B address block. | Trying to use /21 or shorter for various places including international, | from the natural class B block, we have now. Do you see any problem on | announcing as /21 to the Internet? Yes. Give it back. Renumber into best-fit CIDR blocks from your provider(s) and/or IRR(s). Be a good citizen of the global routing tables, or be filtered. Sean.

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wanted: wireless magic tricks
by Cerqua, Toby 17 Aug '01

17 Aug '01

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(a)platinumsystems.net http://www.platinumsystems.net

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Natural class B address
by Saeyul Park 16 Aug '01

16 Aug '01

Hello Have question about filtering policy on the natural class B address block. Trying to use /21 or shorter for various places including international, from the natural class B block, we have now. Do you see any problem on announcing as /21 to the Internet? This issue looks like discussed in the past, apologize for the same question. Thank you, Sae,

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RE: Internet traffic analysis
by Roeland Meyer 16 Aug '01

16 Aug '01

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Re: wanted: wireless magic tricks
by Mark Allman 16 Aug '01

16 Aug '01

> 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. Not true. If you turn on MS TCP or solaris TCP or whatever you won't get line rate out of the box awithout tweaking things a bit, but you can make *TCP* do it. Some folks here have pushed TCP to over 500 Mbps over an OC-12 satellite channel with the normal, everyday TCP implementation in solaris. (I.e., when you discount header overhead, etc. they got very close to line rate). allman --- Mark Allman -- BBN/NASA GRC -- http://roland.grc.nasa.gov/~mallman/

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Re: wanted: wireless magic tricks
by Mark Allman 16 Aug '01

16 Aug '01

> When we ran a T3 satellite link we installed Mentat boxes on each > end. See: http://www.mentat.com/skyx/skyx-nasa.html for a nice > comparison of TCP vs their SkyX protocol. Bottom line: it works > and no user had to change a thing in their TCP stack. Their > product goes up to T3 speeds, though. If you have access to the > end devices and want to "tune the stack" to achieve full thruput > via high delay links see: > http://www.psc.edu/networking/perf_tune.html Right. Lots of these boxes exist. I would encourage folks to consider the implications of these boxes before putting them in general purpose use, though. They are sometimes OK, and sometimes they may not be. See RFC 3135 for a discussion. allman --- Mark Allman -- BBN/NASA GRC -- http://roland.grc.nasa.gov/~mallman/

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Re: wanted: wireless magic tricks
by Mark Allman 16 Aug '01

16 Aug '01

> Well, that is quite wonderful, but when I approached this problem > with a collegue of mine over a sat link for a client that wasn't > our experience and after considerable tweaking we ended up having > to settle for less. > > PS: got pointers to documents detailing the 500mbps over OC-12 sat link? > email addr will do, as well, I'd love to find out what they did. Yep, sorry -- I should have included a pointer. Try: David E. Brooks, Craig Buffinton, Dave R. Beering, Arun Welch, William D. Ivancic, Mike Zernic, Douglas J. Hoder. ACTS 118x Final Report High Speed TCP Interoperability Testing, July 1999. http://ctd.grc.nasa.gov/5610/publications/TM-1999-209272.pdf In the first couple of pages they show a results of 473 Mbps over an OC-12 circuit (a little less than line rate, but still quite good) using Solaris. Results with other operating systems varied. I seem to remember a presentation at the TCP Over Satellite IETF WG where over 500 Mbps was reported. My main point was that there is nothing wrong with the TCP *protocol* that makes it under-perform at large delay*bandwidth products. The implementations are not necessarily up to the job in some cases, but the protocol is sound. (Further reference might be the TCPSAT WG's two RFCs: 2488 and 2760). allman --- Mark Allman -- BBN/NASA GRC -- http://roland.grc.nasa.gov/~mallman/

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ScanMail Message: To Sender, sensitive content found and action t aken. (fwd)
by John Fraizer 16 Aug '01

16 Aug '01

>Date: Wed, 15 Aug 2001 23:07:49 -0400 >From: System Attendant <MAIL-SA(a)syndesis.com> >To: 'John Fraizer' <nanog(a)Overkill.EnterZone.Net> >Subject: ScanMail Message: To Sender, sensitive content found and action >taken. > >Trend SMEX Content Filter has detected sensitive content. > >Place = measl(a)mfn.org; Steven J. Sobol; Johnny Eriksson; nanog(a)merit.edu; >postmaster(a)mfn.org; >Sender = John Fraizer >Subject = Re: Affects of the balkanization of mail blacklisting >Delivery Time = August 15, 2001 (Wednesday) 23:07:49 >Policy = Sexual Discrimination >Action on this mail = Quarantine message > >Warning message from administrator: >Sender, Content filter has detected a sensitive e-mail. God! What on earth in my email was sexually discriminatory? I don't like SPAMMERS. I don't care if they're male, female or hermaphrodite. No discrimination. They should all be shot on site! --- John Fraizer EnterZone, Inc

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RE: wanted: wireless magic tricks
by Young, Jason 16 Aug '01

16 Aug '01

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(a)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(a)platinumsystems.net > http://www.platinumsystems.net >

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