December 2008 - Test - lists.nanog.org

Re: Re: Recommendation of Tools
by aawolfe＠gmail.com 03 Dec '08

03 Dec '08

On Dec 3, 2008 1:52am, Pekka Savola <pekkas(a)netcore.fi> wrote: > On Tue, 2 Dec 2008, Andrew Mulholland wrote: > > > On Tue, Dec 2, 2008 at 10:47 PM, Lee, Steven (NSG Malaysia) > kin-wei.lee(a)hp.com> wrote: > > > > > Hi all, do you have any recommended tools that can measure latency/delay > > hop by hop basis? Preferable the tools can measure the running (live) > > traffic. > > > > > > > mtr ? - http://www.bitwizard.nl/mtr/ > > > > > FWIW, Mtr measures latency/delay and loss based on ICMP messages heard back from the routers on path. As a result, in almost all cases, the real hop-by-hop latency of actual end-to-end data packets is better than it can report. > > tcptraceroute is handy for looking at what's going on with tcp http://michael.toren.net/code/tcptraceroute/ > > -- > > Pekka Savola "You each name yourselves king, yet the > > Netcore Oy kingdom bleeds." > > Systems. Networks. Security. -- George RR Martin: A Clash of Kings > > >

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Tcpdump data collection
by Subba Rao 03 Dec '08

03 Dec '08

Hello, I want to collect data on a network and map the data flow and system/port traffic. There are 2 scenarios of data collection here. The first is to collect IP traffic only. In this method I do not want the data portion of the IP packet (need IP address, source/destination ports etc). The second is to collect traffic that will show all the routing protocols (non-IP) used on this network. Today while collecting the data, I saw several HSRP packets. I don't know what portion of the packet is sufficient to capture for this purpose. I used the "-s 0" option on tcpdump which captures the whole packet. That is making the dump file large. Any help with the filters is appreciated to capture the non-data portion of the packets. Thank you in advance. Subba Rao

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an over-the-top data center
by Steven M. Bellovin 02 Dec '08

02 Dec '08

http://royal.pingdom.com/2008/11/14/the-worlds-most-super-designed-data-cen… (No, I don't know if it's real or not.) --Steve Bellovin, http://www.cs.columbia.edu/~smb

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Followup on Cogent/Sprint
by Joe Greco 02 Dec '08

02 Dec '08

While the recent Cogent/Sprint debate was largely fact-free, I'm following this up with an article that has some facts. http://www.forbes.com/technology/2008/12/01/cogent-sprint-regulation-tech-e… Given that there is a substantial operational impact to events such as this, I believe that this is relevant enough to post here. I would expect most people would rather see discussion happen elsewhere. ... JG -- Joe Greco - sol.net Network Services - Milwaukee, WI - http://www.sol.net "We call it the 'one bite at the apple' rule. Give me one chance [and] then I won't contact you again." - Direct Marketing Ass'n position on e-mail spam(CNN) With 24 million small businesses in the US alone, that's way too many apples.

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Re: an over-the-top data center
by Johnny Eriksson 02 Dec '08

02 Dec '08

> Marshall wrote: > >This is of course off-off-topic, but I would suspect the room > >temperature ultrasonic > >misters, not dry ice or wood smoke. > > > >Regards > >Marshall > > Concur. > > As anyone who works with air conditioning knows, ultrasonic are > the low maintenance option for your humidifier units anyways. > A lot of your datacenters have those 8-) > > There are also doors between the plants and NOC and the server > rooms ... > > Having them external to the AC and pumping visible fog out into > the room instead of invisible into the air feeds is unusual, but > if the resulting humidity (in the NOC, not the server rooms) > is normal it's no big deal. You can have the floor covered in > an inch of water and the air be perfectly safe humidity for > systems (just don't drop a live power cable in the water...). > > I wouldn't do this personally, but if done right it should be safe. This discussion about plants, waterfalls and humidity is getting more and more off-tropic... > -george william herbert > gherbert(a)retro.com --Johnny

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RADB service outage
by Shin Yamasaki 02 Dec '08

02 Dec '08

Hi, It seems Merit's RADB service is not working. Both Web and command-line accesses aren't available. On the Web, it only returns the following string: "Number of objects found: 1" On the command-line, nothing is returned. Not only us but also other folks here in Japan are affected. If someone from Merit sees this, please take a look at the system and take appropriate action. Thank you in advance, -- Shin Yamasaki Japan Network Information Center (JPNIC)

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qwest/cogent/sprint
by Chris Cariffe 02 Dec '08

02 Dec '08

anyone else feeling this? http://www.internethealthreport.com/Main.aspx?Destination=Sprint

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Yahoo! Mail admin?
by Paul Kelly :: Blacknight 02 Dec '08

02 Dec '08

Hi There, Any yahoo! Mail server admins on list? Can you ping me? Paul Paul Kelly Technical Director Blacknight Internet Solutions ltd Hosting, Colocation, Dedicated servers IP Transit Services Tel: +353 (0) 59 9183072 Lo-call: 1850 929 929 DDI: +353 (0) 59 9183091 e-mail: paul(a)blacknight.ie web: http://www.blacknight.ie Blacknight Internet Solutions Ltd, Unit 12A,Barrowside Business Park, Sleaty Road, Graiguecullen, Carlow, Ireland Company No.: 370845

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Re: an over-the-top data center
by Jean-François Mezei 01 Dec '08

01 Dec '08

patrick(a)ianai.net wrote: > The Internet can be mission critical. (Well, not really, but it's =20 > trying.) And for something mission critical, a single point, no =20 > matter how well reinforced, is not good enough. It may not be "mission critical" for any one particular client, but when you bundle all of the separate non critical applications on the net, the impact of downtime on the population becomes important enough to be seen as "critical". Think about airlines expecting passengers to check-in via the internet more and more so that they can reduce staff at airports. > The exchange point should _NOT_ be mission critical. As I explained =20 > multiple times in the thread, if that is your only vector, your design =20= > is broken. Period. Care to argue otherwise? Fair enough. However, in a particular city, you may have difficulty finding multiple different transit providers whose fiber trunks are truly differently routed. It is bad enough that different transit providers may share the same dark fibre cable out of the city. Very large cities such as New York may make it much easier to find truly independant transit links. But for small, medium cities, it becomes harder (especially if geography limits the number of truly separate links). In the end, to form a truly redundant service, you probably need to have a presence in multiple cities, each with its own carrier hotel. And at that point, each carrier hotel need not be "mission critical" because you can continue service from another city. But even if you have backup, you still want the carrier hotels to be robust. And if you can't afford to have data centres/networks in different cities, you do want to have a robust interconnect to the internet. Consider the number of small/medium size ISPs whose infrastructrure is located at the carrier hotel where the local exchange resides. To them, the availability of services at that carrier hotel is mission critical because their bueiness depends on it, and they can't afford to be in multiple locations.

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EIGRP question...
by Mike Lyon 01 Dec '08

01 Dec '08

Howdy, So I am working on an MPLS migration from provider "A" to provider "B" of which both terminate into my core via customer prem routers. I have a single EIGRP process between my core and the two customer prem routers supplied to me by both providers, of which I don't have access to. My question is, I would like to take the routes that come in from the neighbor "A" router and apply some kind of metrics to them so they are not preferred over the routes learned by the provider "B" router. Is this possible or would I need to be running different EIGRP processes between the two customer prem routers and then play around with some redistribution? I am hoping this isn't the case because I don't have access to those CPE routers and redistribution is a nasty thing... Thanks in advance for any enlightnment. Cheers, Mike

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