May 2006 - NZNOG - lists.nznog.org

Re: [nznog] Cell Tax
by Mark Seward 25 May '06

25 May '06

Interesting numbers. After a few weeks of bad performance on an Internet feed I look after I was drawn back to an issue I thought was long buried. This circuit was dropping 4-5% of its traffic at well below advertised capacity. The delivery method was ethernet over ATM/AAL5 (RFC1483). The usual suspects were rounded up and shot (duplex and error counters, purple switches, the cleaning lady). The next question was overhead for cell tax and encapsulation. 12% seems to be the allowance by our supplier. IIRC this is the same as was used 10 years ago for ATM VCs delivered directly to routers (no ethernet involved); nanog has a few dusty posts about this number. It seems this is no longer enough. Perhaps average packet sizes have changed since then if 12% was ever a reasonable number. In the end our supplier ramped overhead to about 20% and the pipe has performed nicely since. For an ethernet service, I don't understand why they don't simply provision the VC (VBR) as large as the customer bearer can handle and let the end devices do the shaping. Michael's numbers including AAL5 padding give this new figure some context: Upstream: cell tax = 14.84% (18.09% AAL5) Downstream: cell tax = 18.35% (23.43% AAL5) Is anyone aware of a recent study of packet size distribution on Internet traffic? CAIDA have some information from the AIX in 1999, NLANR from '97, and Sprint do a semi-regular dump from their ipmon project. http://www.caida.org/analysis/AIX/plen_hist http://www.nlanr.net/NA/Learn/packetsizes.html http://ipmon.sprint.com/packstat/packetoverview.php >From netflow stats on this link, I see a similar story with 64, 576 and 1536B being the points of most interest. The percentage of 1536B packets (~25) I think is larger now than previously. Has anyone had similar frustrations with PVC dimensioning? Does anyone else still use ATM? :) Mark. On 5/23/06, Michael Newbery < Michael.Newbery(a)team.telstraclear.co.nz> wrote: > > Prompted by Mark Seward, we have had a look at the cell tax incurred for > our > customers, in those cases where we are unfortunate enough to have to > transit > an ATM pipe. Which has not been the usual case on our network but becomes > interesting for things like UBS. > > This enables us to answer the question: for a pipe of x bps sufficient to > carry pure IP, how much bigger must the ATM PVC be to carry the same load? > > > IP_bw = x > ATM_bw = ceiling(x/48)*53 > Diff = ATM_bw - IP_bw > Cell_tax = Diff/IP_bw > > For a sample SAMP, we calculate the mean cell tax as > (sum(ceiling( SAMP/48)*53) - sum(SAMP))/sum(SAMP) > > Looking at a 24 hour sample, we get: > Upstream: cell tax = 14.84% > Downstream: cell tax = 18.35% > > I understand that this is somewhat at variance with the standard > provisioning rules applied by another provider. > -- > Michael Newbery IP Architect TelstraClear Limited > Tel: +64-4-920 3102 Mobile: +64-29-920 3102 Fax: +64-4-920 3361 > > > _______________________________________________ > NZNOG mailing list > NZNOG(a)list.waikato.ac.nz > http://list.waikato.ac.nz/mailman/listinfo/nznog > >

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InternetNZ Internet Governance Positions
by Keith Davidson 24 May '06

24 May '06

Pardon the intrusion and slightly off topic subject: Interested in Internet governance? InternetNZ is recruiting directors to sit on the Board of its subsidiary company, New Zealand Domain Name Registry Ltd (trading as .nz Registry Services or "NZRS"); and members to sit on the .nz Oversight Committee ("NZOC"), which has stewardship of the .nz domain name space. These positions provide an exciting opportunity to contribute to the good governance of the .nz domain name space. Company directors and those with general governance skills are encouraged to apply for the appropriate positions. The retiring incumbents are eligible for reappointment. Complete descriptions and application details for both roles can be found online at www.internetnz.net.nz/vacancy. More information on the Office of the Domain Name Commissioner can be found at www.dnc.org.nz; and about the registry company at www.nzrs.net.nz. Applications by email to vacancy(a)internetnz.net.nz are invited from suitably qualified people, and close at midnight on Saturday 3 June. Please follow the links above for further details. If you are aware of anyone who you feel would be appropriate for one of the vacancies, we would be most grateful if you could forward this information to them. Furthermore, it is coming up to AGM time for InternetNZ and we are always on the lookout for enthusiastic people to serve on our Council and various committees and working groups. Links to further details on these positions are at www.internetnz.net.nz/vacancy. Any successful recruitment from a connection with NZNOG will result in a reward of provision of beer to all associated. Regards Keith Davidson Executive Director - InternetNZ

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Notification of NZRR Database changes
by NZRR Database Notifications 24 May '06

24 May '06

Dear Colleague, This is to notify you that some object(s) in NZRR database which you either maintain or are listed as to-be-notified have been added, deleted or changed. These objects are used to configure the various NZIX route servers (http://nzix.net/) so you can expect the relevant servers to be reloaded in the near future. The reloading of the servers is staggered over a period of time so that if you are peering with both servers at an exchange, you can maintain at least one BGP session at all times and consequently a full set of routes. --- PREVIOUS OBJECT: route-set: AS9560:RS-ROUTES:AS9503 descr: advertised to AS9560 by FX Networks - AS9503 members: 131.203.0.0/16^16-29, 161.29.0.0/16^16-29, 161.65.0.0/16^16-29, 202.53.176.0/20^20-29, 202.174.160.0/20^20-29, 202.191.32.0/20^20-29, 202.50.200.0/21^21-29, 202.78.240.0/21^21-29, 203.190.208.0/21^21-29, 202.50.52.0/22^22-29, 202.50.196.0/22^22-29, 202.59.4.0/22^22-29, 202.37.86.0/23^23-29, 202.49.80.0/23^23-29, 202.124.106.0/23^23-29, 192.88.85.0/24^24-29, 192.133.31.0/24^24-29, 202.20.97.0/24^24-29, 202.27.208.0/24^24-29, 202.36.119.0/24^24-29, 202.36.183.0/24^24-29, 202.36.226.0/24^24-29, 202.46.190.0/24^24-29, 202.50.247.0/24^24-29 admin-c: RPA1-NZRR tech-c: RPA1-NZRR notify: rpsl-admin(a)nzix.net notify: nznog(a)list.waikato.ac.nz notify: noc-minor(a)fx.net.nz mnt-by: MAINT-NZRR-NZ changed: rpsl-admin(a)nzix.net 20060523 source: NZRR REPLACED BY: route-set: AS9560:RS-ROUTES:AS9503 descr: advertised to AS9560 by FX Networks - AS9503 members: 131.203.0.0/16^16-29, 161.29.0.0/16^16-29, 161.65.0.0/16^16-29, 202.53.176.0/20^20-29, 202.174.160.0/20^20-29, 202.191.32.0/20^20-29, 202.50.200.0/21^21-29, 202.78.240.0/21^21-29, 203.190.208.0/21^21-29, 202.50.52.0/22^22-29, 202.50.196.0/22^22-29, 202.59.4.0/22^22-29, 202.37.86.0/23^23-29, 202.49.80.0/23^23-29, 202.124.106.0/23^23-29, 192.88.85.0/24^24-29, 192.133.31.0/24^24-29, 202.20.97.0/24^24-29, 202.27.208.0/24^24-29, 202.36.119.0/24^24-29, 202.36.183.0/24^24-29, 202.36.226.0/24^24-29, 202.46.190.0/24^24-29, 202.50.247.0/24^24-29 admin-c: RPA1-NZRR tech-c: RPA1-NZRR notify: rpsl-admin(a)nzix.net notify: nznog(a)list.waikato.ac.nz notify: noc-minor(a)fx.net.nz mnt-by: MAINT-NZRR-NZ changed: rpsl-admin(a)nzix.net 20060525 source: NZRR

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Xtra mail issues to AOL.com
by Drew Broadley 24 May '06

24 May '06

Could someone on Xtra's side please contact me offlist in regards to this. In the last four plus days this has happened and mail coming from AOL to Xtra is fine. -----Original Message----- From: "Mail Administrator"<Postmaster(a)xtra.co.nz> Sent: 25/05/06 8:54:57 a.m. To: "goldenfleece(a)clear.net.nz"<goldenfleece(a)clear.net.nz> Subject: Mail System Error - Returned Mail This is a system generated message. Please DO NOT REPLY. Your message was not delivered for the following reason: Your message was not delivered because the destination computer was not reachable within the allowed queue period. The amount of time a message is queued before it is returned depends on local configura- tion parameters. Most likely there is a network problem that prevented delivery, but it is also possible that the computer is turned off, or does not have a mail system running right now. Your message was not delivered within 4 days and 0 hours. Host aol.com is not responding. The following recipients did not receive this message: <wooluk(a)aol.com> For more information on why this message wasn't delivered, and an explanati [Message truncated. Tap Edit->Mark for Download to get remaining portion.]

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for those who have spare time today and aren't here.....
by Richard Naylor 22 May '06

22 May '06

http://www.r2.co.nz/20060524/

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Sorbs - Further Notification
by Bruce Harding 22 May '06

22 May '06

For those using Sorbs for any sort of blocking, you may have trouble receiving mail from Inspire Net now that they have chosen to block our 2 primary Mail servers. -- Bruce Harding Inspire Net Ltd Phone : 06 357 8559 Fax : 06 353 1154 Mobile : 021 519 024

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Re: [nznog] DNS lookup for IPs of healthalliance.co.nz
by Clement Ashwal 22 May '06

22 May '06

Thanks for all your inputs guys. Since 2:15pm the nslookup for the URLs and also to all the SMTP servers hosted by Healthalliance have started to work by itself without anybody having to do any changes. I did get in touch with the Healthalliance techs and they seemed to have done nothing at all. Quite mysterious I must say. Hope it continues to work without any disruptions. Clement Ashwal Sr Network Analyst The University of Auckland + 6493737599 x 87993 -----Original Message----- From: jfp [mailto:jfp(a)clearfield.com] Sent: Tuesday, 23 May 2006 1:42 p.m. To: nznog(a)list.waikato.ac.nz Subject: Re: [nznog] DNS lookup for IPs of healthalliance.co.nz Well it looks like ns1.healthalliance.co.nz is down. dig www.healthalliance.co.nz @210.54.1.142 works dig www.healthalliance.co.nz @210.54.1.143 fails. given the the reverse DNS for 210.54.1.143 and 210.54.1.142 is also on those servers, you're going to get timeouts galore. ns1.healthalliance.co.nz. 86400 IN A 210.54.1.143 ns2.healthalliance.co.nz. 86400 IN A 210.54.1.142 jfp. ------------------------------------------------------------------------ Jean-Francois Pirus <jfp(a)clearfield.com> Senior Software Engineer Phone (+64-9) 358 2081 Clearfield Software Ltd Fax (+64-9) 358 2083 4th Floor 8-10 Whitaker Place Mob (+64-21) 640 779 P O Box 3901 Auckland, New Zealand ------------------------------------------------------------------------ _______________________________________________ NZNOG mailing list NZNOG(a)list.waikato.ac.nz http://list.waikato.ac.nz/mailman/listinfo/nznog

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Notification of NZRR Database changes
by NZRR Database Notifications 22 May '06

22 May '06

Dear Colleague, This is to notify you that some object(s) in NZRR database which you either maintain or are listed as to-be-notified have been added, deleted or changed. These objects are used to configure the various NZIX route servers (http://nzix.net/) so you can expect the relevant servers to be reloaded in the near future. The reloading of the servers is staggered over a period of time so that if you are peering with both servers at an exchange, you can maintain at least one BGP session at all times and consequently a full set of routes. --- PREVIOUS OBJECT: route-set: AS9439:RS-ROUTES:AS9503 descr: advertised to AS9439 by FX Networks - AS9503 members: 131.203.0.0/16^16-29, 161.29.0.0/16^16-29, 161.65.0.0/16^16-29, 202.50.208.0/20^20-29, 202.53.176.0/20^20-29, 202.174.160.0/20^20-29, 202.191.32.0/20^20-29, 202.50.200.0/21^21-29, 202.78.240.0/21^21-29, 203.190.208.0/21^21-29, 202.50.52.0/22^22-29, 202.50.196.0/22^22-29, 202.59.4.0/22^22-29, 202.37.86.0/23^23-29, 202.49.80.0/23^23-29, 202.124.106.0/23^23-29, 192.88.85.0/24^24-29, 192.133.31.0/24^24-29, 202.20.97.0/24^24-29, 202.27.208.0/24^24-29, 202.36.119.0/24^24-29, 202.36.183.0/24^24-29, 202.36.226.0/24^24-29, 202.46.190.0/24^24-29, 202.50.247.0/24^24-29, 203.97.5.0/24^24-29 admin-c: RPA1-NZRR tech-c: RPA1-NZRR notify: rpsl-admin(a)nzix.net notify: nznog(a)list.waikato.ac.nz notify: noc-minor(a)fx.net.nz mnt-by: MAINT-NZRR-NZ changed: rpsl-admin(a)nzix.net 20060522 source: NZRR REPLACED BY: route-set: AS9439:RS-ROUTES:AS9503 descr: advertised to AS9439 by FX Networks - AS9503 members: 131.203.0.0/16^16-29, 161.29.0.0/16^16-29, 161.65.0.0/16^16-29, 202.53.176.0/20^20-29, 202.174.160.0/20^20-29, 202.191.32.0/20^20-29, 202.50.200.0/21^21-29, 202.78.240.0/21^21-29, 203.190.208.0/21^21-29, 202.50.52.0/22^22-29, 202.50.196.0/22^22-29, 202.59.4.0/22^22-29, 202.37.86.0/23^23-29, 202.49.80.0/23^23-29, 202.124.106.0/23^23-29, 192.88.85.0/24^24-29, 192.133.31.0/24^24-29, 202.20.97.0/24^24-29, 202.27.208.0/24^24-29, 202.36.119.0/24^24-29, 202.36.183.0/24^24-29, 202.36.226.0/24^24-29, 202.46.190.0/24^24-29, 202.50.247.0/24^24-29 admin-c: RPA1-NZRR tech-c: RPA1-NZRR notify: rpsl-admin(a)nzix.net notify: nznog(a)list.waikato.ac.nz notify: noc-minor(a)fx.net.nz mnt-by: MAINT-NZRR-NZ changed: rpsl-admin(a)nzix.net 20060523 source: NZRR

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Notification of NZRR Database changes
by NZRR Database Notifications 22 May '06

22 May '06

Dear Colleague, This is to notify you that some object(s) in NZRR database which you either maintain or are listed as to-be-notified have been added, deleted or changed. These objects are used to configure the various NZIX route servers (http://nzix.net/) so you can expect the relevant servers to be reloaded in the near future. The reloading of the servers is staggered over a period of time so that if you are peering with both servers at an exchange, you can maintain at least one BGP session at all times and consequently a full set of routes. --- PREVIOUS OBJECT: route-set: AS9560:RS-ROUTES:AS9503 descr: advertised to AS9560 by FX Networks - AS9503 members: 131.203.0.0/16^16-29, 161.29.0.0/16^16-29, 161.65.0.0/16^16-29, 202.50.208.0/20^20-29, 202.53.176.0/20^20-29, 202.174.160.0/20^20-29, 202.191.32.0/20^20-29, 202.50.200.0/21^21-29, 202.78.240.0/21^21-29, 203.190.208.0/21^21-29, 202.50.52.0/22^22-29, 202.50.196.0/22^22-29, 202.59.4.0/22^22-29, 202.37.86.0/23^23-29, 202.49.80.0/23^23-29, 202.124.106.0/23^23-29, 192.88.85.0/24^24-29, 192.133.31.0/24^24-29, 202.20.97.0/24^24-29, 202.27.208.0/24^24-29, 202.36.119.0/24^24-29, 202.36.183.0/24^24-29, 202.36.226.0/24^24-29, 202.46.190.0/24^24-29, 202.50.247.0/24^24-29, 203.97.5.0/24^24-29 admin-c: RPA1-NZRR tech-c: RPA1-NZRR notify: rpsl-admin(a)nzix.net notify: nznog(a)list.waikato.ac.nz notify: noc-minor(a)fx.net.nz mnt-by: MAINT-NZRR-NZ changed: rpsl-admin(a)nzix.net 20060522 source: NZRR REPLACED BY: route-set: AS9560:RS-ROUTES:AS9503 descr: advertised to AS9560 by FX Networks - AS9503 members: 131.203.0.0/16^16-29, 161.29.0.0/16^16-29, 161.65.0.0/16^16-29, 202.53.176.0/20^20-29, 202.174.160.0/20^20-29, 202.191.32.0/20^20-29, 202.50.200.0/21^21-29, 202.78.240.0/21^21-29, 203.190.208.0/21^21-29, 202.50.52.0/22^22-29, 202.50.196.0/22^22-29, 202.59.4.0/22^22-29, 202.37.86.0/23^23-29, 202.49.80.0/23^23-29, 202.124.106.0/23^23-29, 192.88.85.0/24^24-29, 192.133.31.0/24^24-29, 202.20.97.0/24^24-29, 202.27.208.0/24^24-29, 202.36.119.0/24^24-29, 202.36.183.0/24^24-29, 202.36.226.0/24^24-29, 202.46.190.0/24^24-29, 202.50.247.0/24^24-29 admin-c: RPA1-NZRR tech-c: RPA1-NZRR notify: rpsl-admin(a)nzix.net notify: nznog(a)list.waikato.ac.nz notify: noc-minor(a)fx.net.nz mnt-by: MAINT-NZRR-NZ changed: rpsl-admin(a)nzix.net 20060523 source: NZRR

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Cell Tax
by Michael Newbery 22 May '06

22 May '06

Prompted by Mark Seward, we have had a look at the cell tax incurred for our customers, in those cases where we are unfortunate enough to have to transit an ATM pipe. Which has not been the usual case on our network but becomes interesting for things like UBS. This enables us to answer the question: for a pipe of x bps sufficient to carry pure IP, how much bigger must the ATM PVC be to carry the same load? IP_bw = x ATM_bw = ceiling(x/48)*53 Diff = ATM_bw - IP_bw Cell_tax = Diff/IP_bw For a sample SAMP, we calculate the mean cell tax as (sum(ceiling( SAMP/48)*53) - sum(SAMP))/sum(SAMP) Looking at a 24 hour sample, we get: Upstream: cell tax = 14.84% Downstream: cell tax = 18.35% I understand that this is somewhat at variance with the standard provisioning rules applied by another provider. -- Michael Newbery IP Architect TelstraClear Limited Tel: +64-4-920 3102 Mobile: +64-29-920 3102 Fax: +64-4-920 3361

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