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Frame-Relay vs. ATM?
by Los, Ralph 15 Jun '01

15 Jun '01

Hello everyone, I apologize for putting this out to everyone, but I don't know the answer to this question and I feel it's best to go to the source. My company is forcing me to do a Frame vs. ATM cost-benefit comparison. The Frame-Relay connection would be PVC's connecting 3 sites, Chicago, West-Coast, East-cost (offices). I am attempting to do video-on-demand, voice-over-IP, and data over these pipes, and would like to ability to do Internet+private LAN connecting all 3 sites for file-sharing, email sharing, etc without having to do VPN over the Internet. My question? What is the benefit of Frame-Relay from say, Sprint or AT&T versus an ATM connection for all 3 sites from Savvis or Broadwing? I'm trying to find the technical details and merits behind both these methods/technologies. Any replies would be appreciated off-list, and I will send a aggregate report to anyone interested. Thank you much everyone for answers in advance, Ralph M. Los Asst. Vice-President, Internet Systems and Security EnvestNet Advisory Corp. rlos(a)envestnet.com (312) 827-3945 (direct) (312) 296-9003 (wireless w/voicemail)

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cogentco.com technical analysis?
by Murphy, Brennan 15 Jun '01

15 Jun '01

I was wondering if anyone had any experience with Cogent Inc. They are one of the companies offering high speed internet (fast ethernet/GigE) at rock bottom prices. :-) I know the adage "you get what you pay for" typically applies but I was looking for some concrete end user experiences. I'm not trying to break the charter of this mailing list by devoting a discussion to various emotion based opinions about a particular vendor. I am actually seeking technical opinions on whether what is being advertised is actually being delivered with reliability. More specific questions: do Cogent's peering arrangements seem adequate to the amount of bandwidth they are offering? Or are these major bottlenecks to an otherwise good network? Are any of Cogent's competitors worth taking a look at? Any non-obvious reason why? Does anyone have any statistics to provide that paints a picture about what you get from their products? I guess if enough people complained that this was too off topic, I could still request direct replies and I could put a summary together for any interested parties. But I reread the charter before putting this together and it seems fair game. When is Worldcom, et al going to start offering these products? ( maybe when companies like cogent start succeeding?) Thanks, -BM

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RE: Mae-East FDDI funeral
by Hire, Ejay 15 Jun '01

15 Jun '01

>P.S. Mae-East FDDI officially gets turned off tomorrow (June 15th) according >to the most recent update I've seen. Anybody know if they are going to be doing equipment disposal? I'd love to add FDDI to my home not-for-commercial-or-profitable-use-please-let-the-gods-of-networking-smile -on-me lab. I have a truck, and will haul. (and I'm not completely above dumpster diving either!) -Ejay

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Re: Multicast Traffic on Backbones
by Thomas R. Charron 15 Jun '01

15 Jun '01

>Essentially every major network operator has one network engineer >who can set up multicast for customers. The problem is very few >networks have figured out how to turn multicast into a commercial >product. So if you don't find that one engineer, you are out of >luck. >Unicast streaming may be less efficient, but most providers can figure >out how to charge for it and make it a supported product. Unfortunately >some folks have confused multimedia with multicast. While I've seen >many multimedia multicast applications, I haven't seen one which can't >have its essential elements replicated by unicast streams. Is there >a killer-ap for multicast? A South Korean company has developed an app that sets up multicast on a network automatically. No router config required. It does it with a small active-x that installs on a user's machine and gives a server on the ntwk all the info it needs to route the multicast stream. Pretty cool stuff. I'd call it a killer-ap for multicasting. Tom

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RE: Multicast Traffic on Backbones
by Thomas R. Charron 15 Jun '01

15 Jun '01

"Thomas R. Charron" <tomc(a)koreawisenut.com> writes: > A South Korean company has developed an app that sets up multicast on a > network automatically. No router config required. It does it with a small > active-x that installs on a user's machine and gives a server on the ntwk > all the info it needs to route the multicast stream. Pretty cool stuff. > I'd call it a killer-ap for multicasting. It sounds as if I'd probably call it "unicast". ---Rob No, it's multicasting. The active-x interacts with the server to determine which clients are viable for grouping into a virtual multicasting ntwk (independently of routers). These little active-x's interact with the server to register themselves in a multicast group, and they can repeat the signal for others in their group or even to other groups. It's P2P and IP Multicasting put together. Tom

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Re: Multicast Traffic on Backbones
by rs＠seastrom.com 15 Jun '01

15 Jun '01

"Thomas R. Charron" <tomc(a)koreawisenut.com> writes: > A South Korean company has developed an app that sets up multicast on a > network automatically. No router config required. It does it with a small > active-x that installs on a user's machine and gives a server on the ntwk > all the info it needs to route the multicast stream. Pretty cool stuff. > I'd call it a killer-ap for multicasting. It sounds as if I'd probably call it "unicast". ---Rob

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a.root-servers.net power issue (why there are 13)
by Sean Donelan 15 Jun '01

15 Jun '01

The NSI data center housing one of the root servers, a.root-servers.net, lost utility power today. Reportedly an outside utility transformer was damaged. Generators come on-line, and the servers remained up. NSI didn't show any loss of traffic, however a couple of ISP MRTG graphs of ping status did indicate a brief 15 minute network interruption. This may indicate an external issue, i.e. outside of NSI, such as a network re-route or flap. On the followup investigation, folks may want to check if there was a piece of equipment which wasn't plugged into where they thought it was. NSI has several different provider's networks into their building, so a proble with one network wouldn't affect the others. Matrix (average.miq.net) shows overall the combination of the dns-root servers stable, and relatively unchanged. In general, the root-server design is robust; and even if one root-server completely failed, the affect would be minor for several days.

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Re: Exploding manhole covers in Washington DC
by Richard A. Steenbergen 14 Jun '01

14 Jun '01

On Thu, Jun 14, 2001 at 05:35:58PM -0400, Deepak Jain wrote: > > PEPCO doesn't know why these manholes are blowing up, but started > putting grated manhole covers on to prevent this. Don't know if this > one was grated or solid. http://www.nbc4.com/images/NBC2JRIEYNCP.jpg That one looks solid to me. But at long as it didn't cut any fiber, why do we care. :P If you are in DC and you hear a bang, you should probably duck. I'm certain most DC residents are familiar with this one already. -- Richard A Steenbergen <ras(a)e-gerbil.net> http://www.e-gerbil.net/ras PGP Key ID: 0x138EA177 (67 29 D7 BC E8 18 3E DA B2 46 B3 D8 14 36 FE B6)

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RE: What is up with 170.36.0.0/16
by Hire, Ejay 14 Jun '01

14 Jun '01

A peek at Merit shows that they haven't been advertised since the 8th. http://www.merit.edu/ipma/routing_table/ has a daily snapshot of the routing tables since the 8th. >From looking at their DNS entries, I'd guess their Administrator needs to reverse the priority of the MX records. The second one isn't pingable, but is telnet port 25 -able. -EJ -----Original Message----- From: Erik Antelman [mailto:erik@nombas.com] Sent: Thursday, June 14, 2001 11:29 AM To: nanog(a)merit.edu Subject: What is up with 170.36.0.0/16 Is someone renumbering around this area? My motivation is to understand the mechanisms and techniques \ by which a non-privelaged user (ie someone without login access to a BGP fed router) would diagnose (characterize, locate, identify, etc..) failure to reach a large corporations mail servers (1/2 of the MX servers for fleet.com) RADB has nothing on this, a New York QWEST looking glass says: Query: bgp IP address: 170.36.73.11 Location: New York Timeout: 20 seconds % Network not in table What's up?

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New list Top 10 ISPs
by Sean Donelan 14 Jun '01

14 Jun '01

NetworkWorld published an article citing research from Probe Research ranking the top 10 ISPs and their marketshare based on Year-end (2000) revenue. 1. Worldcom (27.9%) 2. AT&T (10%) 3. Sprint (6.5%) 4. Genuity (6.3%) 5. PSINet (4.1%) 6. Cable & Wireless (3.5%) 7. XO Communications (2.8%) 8. Verio (2.6%) 9. Qwest (1.5%) 10. Global Crossing (1.3%) Since PSI is larger than C&W, that C&W should pay for transit :-) I don't know what happened to Level 3, ELI, @HOME, Broadwing, or all the non-US ISPs. http://www.nwfusion.com/newsletters/isp/2001/00846039.html

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