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Re: Comcast problems?
by Ted Fischer 06 Apr '08

06 Apr '08

I didn't save any of my Wireshark traces, but this is what I observed (I'm behind Charter at home but visiting my brother in NJ - Comcast territory). All attempts to check my e-mail (neither Charter nor Comcast) showed the syns going out but no syn acks coming back. Then, after a few minutes (pop server time outs I guess) I started seeing fins coming back from the pop server that matched my connection requests. Saw that occur with various http connection attempts as well. Of course, the only reason I can send this reply out is that they appear to be back up. Any chance of getting a non-nonsensical RFO from someone? Ted At 02:16 PM 4/5/2008, you wrote: >On Sat, Apr 5, 2008 at 1:44 PM, Steven M. Bellovin ><smb(a)cs.columbia.edu> wrote: > > > The fact that I get different behavior for different protocols makes me > > suspect they're having trouble with equipment designed to control p2p > > traffic. Their help phone line simply speaks of an outage. Service > > has come back occasionally, but not for long. The problem has been > > going on since about 6am. > > > > Does anyone have any data? > >wasn't it sandvine last time? did you try calling them as well? All >joking aside, one hopes that these sorts of things show that the 'p2p >control' soutions are far from perfect and far from 'well baked' and >likely still very ill-advised. > >-Chris

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Re: "Does TCP Need an Overhaul?" (internetevolution, via slashdot)
by Hank Nussbacher 06 Apr '08

06 Apr '08

At 03:54 PM 05-04-08 -0500, Jorge Amodio wrote: >outstanding compilation Hank, thanks !!! >>I suggest reading the excellent page: >>"High-Speed TCP Variants": >>http://kb.pert.geant2.net/PERTKB/TcpHighSpeedVariants > >Rgds >-Jorge It is the result of the Geant2 SA3 working group. There is much more there than just TCP variants. Regards, Hank

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Akamai/Speedera outages this weekend?
by david raistrick 05 Apr '08

05 Apr '08

Anyone know anything about the Speedera (now Akamai) outages this weekend? https://cachecontrol.speedera.com/cgi-bin/cpurge.pl has been off and on unreachable since last night, which is causing fits for some parts of our application... of course, I have been able to find zero contact information for our account with speedera/akamai internally...anyone know anything? ..david --- david raistrick http://www.netmeister.org/news/learn2quote.html drais(a)icantclick.org http://www.expita.com/nomime.html

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Nanog 43/CBX -- Hotel codes etc
by David Diaz 05 Apr '08

05 Apr '08

Since several members pointed out I should post this information as people are buying their plane tickets here it is: If you plan on staying over in NY for a few extra nights to attend CBX or just enjoy the city you will need to use the codes below. I would recommend calling the hotel since you will need your nanog code as well as the CBX code below for your longer duration stay. Also, if you are PLANNING ANY EVENTS during the nanog and wish that information passed on to other attendees please feel free to forward me your event. I can also help make sure it does not conflict with any other events. I do know there are events planned for the weekend prior to nanog and there are events afterwards during the CBX. TIPS: New York is a wonderful city, however, as with any large city travel safely -Do not use your iPod white ear pieces. Especially on the subway at night -Travel in groups or with a local -Know where you are going ahead of time so you do not need to keep the map open -Using your laptop on the train at night and storing it in a big laptop bag that says LAPTOP or FORUM on it is a no-no -DO NOT go to the wonderful local Apple Store and walk around the city with that white APPLE bag full of iPhones -Stay on the main streets not the allays especially off-Broadway -Car services from the hotel are flat rates and very cost effective. It's a very safe city for the last decade but travel smartly and enjoy. Anyone wishing to be invited or included in any events around the city or sponsored activities please email me at davediaz AT telx.com or davediaz AT gmail.com > HOTEL CODES: Rates for June 4th & 5th at the Brooklyn Bridge Marriott use CODE # TXBTXBA Click here to book now http://cwp.marriott.com/nycbk/cbx/ Cocktail Event at Battery Park Gardens Wednesday June 4th 7 - 11pm - R.S.V.P to jsauer(a)telx.com - All NANOG Attendees are invited Telx Customer Business Exchange "CBX" Thursday June 5th 9am - 3pm Visit http://cbx.telx.com to register *It is FREE to attend - All NANOG Attendees are invited > David Diaz telx +++++++++++++++++++++++++++++++ FACTA NON VERBA

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Time Warner NOC contacts.
by Kirk Winkelman 05 Apr '08

05 Apr '08

If there is anyone from Time Warner NOC on this list, please contact me at kirk.winkelman(a)gmail.com. We are seeing issues with DNS caching inside the RR network. Thanks, Kirk Winkelman Positive Networks

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Comcast problems?
by Steven M. Bellovin 05 Apr '08

05 Apr '08

Anyone know what's going on with Comcast? From my house, I can reach a few sites with TCP (fortunately, that includes my office, so I could set up a web and email proxy). If I use traceroute, I can get more or less anywhere. If I use a UDP-based traceroute, I can get responses back from the first 8 hops. If I use a TCP-based traceroute, I get nowhere. The fact that I get different behavior for different protocols makes me suspect they're having trouble with equipment designed to control p2p traffic. Their help phone line simply speaks of an outage. Service has come back occasionally, but not for long. The problem has been going on since about 6am. Does anyone have any data? --Steve Bellovin, http://www.cs.columbia.edu/~smb

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RE: cooling door
by Frank Coluccio 05 Apr '08

05 Apr '08

Michael Dillon is spot on when he states the following (quotation below), although he could have gone another step in suggesting how the distance insensitivity of fiber could be further leveraged: >The high speed fibre in Metro Area Networks will tie it all together >with the result that for many applications, it won't matter where >the servers are. In fact, those same servers, and a host of other storage and network elements, can be returned to the LAN rooms and closets of most commercial buildings from whence they originally came prior to the large-scale data center consolidations of the current millennium, once organizations decide to free themselves of the 100-meter constraint imposed by UTP-based LAN hardware and replace those LANs with collapsed fiber backbone designs that attach to remote switches (which could be either in-building or remote), instead of the minimum two switches on every floor that has become customary today. We often discuss the empowerment afforded by optical technology, but we've barely scratched the surface of its ability to effect meaningful architectural changes. The earlier prospects of creating consolidated data centers were once near-universally considered timely and efficient, and they still are in many respects. However, now that the problems associated with a/c and power have entered into the calculus, some data center design strategies are beginning to look more like anachronisms that have been caught in a whip-lash of rapidly shifting conditions, and in a league with the constraints that are imposed by the now-seemingly-obligatory 100-meter UTP design. Frank A. Coluccio DTI Consulting Inc. 212-587-8150 Office 347-526-6788 Mobile On Sat Mar 29 13:57 , sent: > >> Can someone please, pretty please with sugar on top, explain >> the point behind high power density? > >It allows you to market your operation as a "data center". If >you spread it out to reduce power density, then the logical >conclusion is to use multiple physical locations. At that point >you are no longer centralized. > >In any case, a lot of people are now questioning the traditional >data center model from various angles. The time is ripe for a >paradigm change. My theory is that the new paradigm will be centrally >managed, because there is only so much expertise to go around. But >the racks will be physically distributed, in virtually every office >building, because some things need to be close to local users. The >high speed fibre in Metro Area Networks will tie it all together >with the result that for many applications, it won't matter where >the servers are. Note that the Google MapReduce, Amazon EC2, Haddoop >trend will make it much easier to place an application without >worrying about the exact locations of the physical servers. > >Back in the old days, small ISPs set up PoPs by finding a closet >in the back room of a local store to set up modem banks. In the 21st >century folks will be looking for corporate data centers with room >for a rack or two of multicore CPUs running XEN, and Opensolaris >SANs running ZFS/raidz providing iSCSI targets to the XEN VMs. > >--Michael Dillon

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rack power question
by Patrick Giagnocavo 05 Apr '08

05 Apr '08

Hopefully this classifies as on-topic... I am discussing with some investors the possible setup of new datacenter space. Obviously we want to be able to fill a rack, and in order to do so, we need to provide enough power to each rack. Right now we are in spreadsheet mode evaluating different scenarios. Are there cases where more than 6000W per rack would be needed? (We are not worried about cooling due to the special circumstances of the space.) Would someone pay extra for > 7KW in a rack? What would be the maximum you could ever see yourself needing in order to power all 42U ? Cordially Patrick Giagnocavo patrick(a)zill.net

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Microsoft building container based datacenter
by Simon Lyall 05 Apr '08

05 Apr '08

Just a followup to the previous conversations on power and rack density I see that Microsoft has announced that one floor of their new Chicago datacenter will be container based. Each 40 foot container will house 1,000 to 2,000 systems with between 150 and 220 containers on the first floor. Main links: http://www.datacenterknowledge.com/archives/2008/Apr/01/microsoft_embraces_… http://datacenterlinks.blogspot.com/2008/04/miichael-manos-keynote-at-data-… http://mvdirona.com/jrh/perspectives/2008/04/02/FirstContainerizedDataCente… Related link: http://www.datacenterknowledge.com/archives/2008/Apr/04/microsofts_198_mega… -- Simon J. Lyall | Very Busy | Web: http://www.darkmere.gen.nz/ "To stay awake all night adds a day to your life" - Stilgar | eMT.

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Re: "Does TCP Need an Overhaul?" (internetevolution, via slashdot)
by Paul Ferguson 05 Apr '08

05 Apr '08

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 - -- "Christopher Morrow" <morrowc.lists(a)gmail.com> wrote: >I suppose he could try to sell it... and people with larger networks >could see if keeping state on a few million active flows per device is >'expensive' or 'inexpensive'. Perhaps it's less expensive than it >seems as though it would. I like & respect Larry, etc., but actually, he is trying to "sell it" in a semi-disingenuous way: http://www.anagran.com/company_management.php See also: http://www.networkworld.com/news/2007/080607-roberts-fast-flow-routing.html - - ferg -----BEGIN PGP SIGNATURE----- Version: PGP Desktop 9.6.3 (Build 3017) wj8DBQFH9xCaq1pz9mNUZTMRAmSBAJ9FTHV/mWnZXcNR6drkqktdn+3DJACg6gaX 8/TN08qfaXCJrEhwhw0/ybw= =Mr08 -----END PGP SIGNATURE----- -- "Fergie", a.k.a. Paul Ferguson Engineering Architecture for the Internet fergdawg(at)netzero.net ferg's tech blog: http://fergdawg.blogspot.com/

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