July 2004 - Test - lists.nanog.org

RE: mid-mount server rails
by Hannigan, Martin 06 Jul '04

06 Jul '04

That depends on aisle spacing. A four post box has some dimension. Depending upon the aisle spacing, it could obstruct an aisle or obstruct access to other equipment. Midmounting works great in properly sized aisles with defined "working sides" etc. I hate it when I catch something on a box that should be in a cabinet but for some reason it was midmounted when it shouldn't have been. It is kind of dangerous, especially if it's eye level. -M -- Martin Hannigan (c) 617-388-2663 VeriSign, Inc. (w) 703-948-7018 Network Engineer IV Operations & Infrastructure hannigan(a)verisign.com > -----Original Message----- > From: owner-nanog(a)merit.edu [mailto:owner-nanog@merit.edu]On Behalf Of > Aaron Thomas > Sent: Tuesday, July 06, 2004 4:32 PM > To: 'Christopher J. Wolff' > Cc: nanog(a)merit.edu > Subject: RE: mid-mount server rails > > > > Depending on the number of servers, I would just go with a > center mount shelf. More flexible and functionality should you remove > the server... > > Grab some rubber feet (they come with most rack mount network > equipment but are rarely used) on the server and you should be ok... > If you want, you could over strap the server for better security. > > This has worked well for me. > > Cheers, > > Aaron > > -----Original Message----- > From: owner-nanog(a)merit.edu [mailto:owner-nanog@merit.edu] On > Behalf Of Christopher J. Wolff > Sent: July 5, 2004 8:07 PM > To: nanog(a)merit.edu > Subject: mid-mount server rails > > > Hi Nanogers > > If I have a two post relay rack, could you advise on any > generic rails that could be used to 'mid-mount' a 1-4U server > on that two > port rack? Thank you. > > Regards, > Christopher J. Wolff VP CIO > Broadband Laboratories, Inc. > http://www.bblabs.com > > >

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mid-mount server rails
by Christopher J. Wolff 06 Jul '04

06 Jul '04

Hi Nanogers If I have a two post relay rack, could you advise on any generic rails that could be used to 'mid-mount' a 1-4U server on that two port rack? Thank you. Regards, Christopher J. Wolff VP CIO Broadband Laboratories, Inc. http://www.bblabs.com

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Interesting news story - Cisco Training Manual
by Fisher, Shawn 06 Jul '04

06 Jul '04

http://www.lulu.com/items/59000/59202/print/Basham-whole-text.pdf Interesting story about some professor that wrote a Cisco training manual and made it available for free. The site hosting it is getting crushed a bit today. http://zdnet.com.com/Professor+gives+Cisco+manual+away+for+free/2100-1103_2… <http://zdnet.com.com/Professor+gives+Cisco+manual+away+for+free/2100-1103_2…> &tag=feed&subj=zdnn Pretty basic stuff, but I applaud the generosity of time and effort he must have put into this. ----------------------------------------------- Shawn Fisher Vice President - Advanced Services Bresnan Communications (v) 914.641.3367 -----------------------------------------------

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Trouble with Cox/Verio
by Chip Gwyn 06 Jul '04

06 Jul '04

We've been getting alot of questions about Cox and Verio peering today. Anyone know of something specific going on? Thanks, Chip Gwyn +---------------------------------------------------------------------+ | Chip Gwyn | | Network Support Engineer EMAIL: noc(a)internap.com | | Network Operations Center PHONE: (877) 843-4662 US | | InterNAP Network Services 00800-468-37627 UK | +---------------------------------------------------------------------+ | Visit the Customer Support Site -- https://customers.internap.com | | ---------------------------------- | | Please provide NOC feedback via our Customer Satisfaction Survey at | | https://customers.internap.com/nocsurvey/ | +---------------------------------------------------------------------+ | The contents of this email message are confidential and proprietary | +---------------------------------------------------------------------+

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RE: Quick circuit question.
by Williams, Jeff 06 Jul '04

06 Jul '04

You might find what you're looking for at acterna.com/global/technical_resources/index_gbl.html They're the result of the TTC/ WWG merger. Jeff -----Original Message----- From: owner-nanog(a)merit.edu [mailto:owner-nanog@merit.edu] On Behalf Of Scott Weeks Sent: Tuesday, July 06, 2004 1:13 PM To: nanog(a)merit.edu Subject: Re: Quick circuit question. On Tue, 6 Jul 2004, Drew Weaver wrote: : We have 1 DS-3, that if we get close to 45Mbps IN/OUT the other : direction will be completely unusable. We have another DS3, that we have : seen doing 45Mbps IN, and 15Mbps Out at the same time. This is going to : sound dumb, but is duplex a consideration with lines of these types? I : thought you could do either 45Mbps in, 45Mbps out, or a mix of both, not : 45Mbps In, and 45Mbps out at the same time (90mbps).. : : I couldn't find this exact info on the net anywhere. Anyone happen to know of where TTC's online library went a few years ago after they merged with someone? (I've forgotten whom) There was a great deal on T1s, T3s, etc. I have hard copies at home, but it'd sure be nice to get some online copies, if they still exist. scott ************************************************************** This message, including any attachments, contains confidential information intended for a specific individual and purpose, and is protected by law. If you are not the intended recipient, please contact sender immediately by reply e-mail and destroy all copies. You are hereby notified that any disclosure, copying, or distribution of this message, or the taking of any action based on it, is strictly prohibited. TIAA-CREF **************************************************************

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Cox.net contact?
by chuck goolsbee 06 Jul '04

06 Jul '04

If there is anyone here from cox.net, I'd appreciate being contacted offlist. ("Normal channels" are frustratingly unresponsive at this time.) Customers we share are having issues we need to resolve for them. Thanks in advance, -- Chuck Goolsbee V.P. Technical Operations _________________________________________________________________ digital.forest Phone: +1-877-720-0483, x2001 where Internet solutions grow Int'l: +1-425-483-0483 19515 North Creek Parkway Fax: +1-425-482-6871 Suite 208 http://www.forest.net Bothell, WA 98011 email: cg(a)forest.net

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802.17 RPR and L2 Ethernet interoperablity (Ethernet over RPR)
by sam_ml＠spacething.org 06 Jul '04

06 Jul '04

Hi, This is probably a fairly simply question, I'm probably just not quite groking the layers involved here. If I had the following setup: Endstation A -- Switch A === RPR Ring === Switch B -- Endstation B could there be a VLAN setup such that Endstations A and B are both in it, and can communicate as if they are on the same LAN segment? (And I mean natively. ie. not using an MPLS VPN). ie. Will the switches involved tranlate the different framing formats in use? Is this vendor dependent? Sam

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South Florida IXes
by Daniel Corbe 06 Jul '04

06 Jul '04

Anyone know of or operate either a commercial or non-commercial IX in the Ft. Lauderdale area? If not I'm willing to drive to Miami or Boca Raton. Please contact me off-list.

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RE: Quick circuit question.
by Michel Py 06 Jul '04

06 Jul '04

> Drew Weaver wrote: > is duplex a consideration with lines of these types? DS3s are full-duplex AFAIK. There are two coax cables (one in one out) and I don't ever remember seeing anything that looked like a collision detection mechanism. Compare to Ethernet: on 10base-2 or 10base-5, you have half-duplex as the physical medium (single coax) is the same for transmit and receive. Same on a 10base-T or 100base-T hub, where even if the TX and Rx pairs are separate they are mixed inside the hub. When connected to a switch, a NIC that either is configured to full-duplex or negociates full-duplex actually deactivates its built-in collision detection circuit. > We have 1 DS-3, that if we get close to 45Mbps IN/OUT the > other direction will be completely unusable. The condition you describe is rather common: your upstream is maxed out and your downstream becomes very slow. This has nothing to do with duplex: your downstream sits unused. The perceived slowness is likely due to DNS requests, TCP SYNs and the like being slowed or discarded in the egress queue. If you traffic-shape your egress (by tweaking queuing, among other things) you could get close to 45Mpbs in and out. Usual tricks include granting small packets a higher priority, and lowering the priority of packets that max out your pipe. Things such as wRED and dCAR are to be looked at too. Michel.

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Re: Peering point speed publicly available?
by Stewart, William C (Bill), RTSLS 06 Jul '04

06 Jul '04

On or about July 1 2004, Erik <allegedly at> myevilempire.net> Amundson allegedly asked about peering point bandwidth. Some North American ISPs will tell you that under non-disclosure, but almost all of them will point you to their standards for peering, and you won't find many Tier 1 ISPs that peer at less than DS3 in the US, and probably not many in Canada, London, Amsterdam, Tokyo, or Singapore either. That means the insertion delay is under 0.27ms, or about 27 fiber-miles, so it's less important than whether the peering is in San Francisco or San Jose. Queuing due to overload is really much more important than absolute size. Also, if you're dealing with ISPs that use public peering points, those may be a performance concern, but in the US that's mostly not Tier1-Tier1. (Linx is a different case entirely, assuming you want your traffic to be in London.) Smaller ISPs might be more talkative, or if you're having actual problems, like why your connection from minneapolis.example1.net to stpaul.example2.net goes through a peering point in San Francisco instead of peering in Minnesota or at most Chicago, big ISPs can also be pretty talkative.

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