May 2009 - Test - lists.nanog.org

Network topology
by Colin Alston 15 Nov '13

15 Nov '13

Hi all I'm considering trying to come up with some means to automatically detect a networks topology and draw pretty pictures. This is somewhat boring though if a network isn't well arranged with VLANs and q-tag trunk routers and so on (It will just look like a big cloud of junk connected off an assumed switch). Is there any kind of cunning trick to detect standard layer2 switches along a path without stuff like STP?

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Inventory and workflow management systems
by vijay gill 26 May '13

26 May '13

What software solution do people use for inventory management for things like riser/conduit drawdown, fiber inventory, physical topology store, CLR/DLR, x-connect, contracts, port inventory, etc. Any experiences in integrating workflow into those packages for work orders, modeling, drawdown levels, etc. /vijay

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Re: Re: What is the most standard subnet length on internet
by 정치영 02 Aug '09

02 Aug '09

Suresh, Yes, I guess my concern is close to the second meaning. It seems so simple. Currently annoucement of /24 seems to be okey, most upstream providers accept this. However I wonder if there is any ground rule based on any standard or official recommandation. If there is some standardized rule about prefix length to be annouced, I will make my bgp & IP allocation policy of each data center of my company, and I will be able to more fairly and squarely speak to my customer like this "You have to change your server's IP address if you want move your server to other place" chiyoung ============================================= Chi-Young Joung SAMSUNG NETWORKS Inc. Email: lionair(a)samsung.com Tel +82 70 7015 0623, Mobile +82 17 520 9193 Fax +82 70 7016 0031 ============================================= ------- Original Message ------- Sender : Suresh Ramasubramanian<ops.lists(a)gmail.com> Date : 2008-12-19 12:37 (GMT+09:00) Title : Re: What is the most standard subnet length on internet Chi Young, let me clarify one thing here .. Do you mean IP allocation as in subnet allocation, swipping in apnic or through a rwhois server etc? Or do you mean "what is the minimum subnet size I can announce on the internet and have other providers not drop it on the floor"? srs On Fri, Dec 19, 2008 at 8:10 AM, 정치영 <lionair(a)samsung.com> wrote: > Hi everyone, > > I'm going to rebuild IP allocation policy of my company and I am looking for some standard reference for my policy. > I have already studied some standard like RFC1518, RIPE181, RFC2050 and I got it is very important to maintain hierachy structure. > However, what I am really wondering is what is the most standard subnet length that always can be guaranteed through Internet. less than /24 bit ? > I could not find any documents about that, which subnet length is most proper value and pursue internet standard policy ? >

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Anomalies with AS13214 ?
by Jay Hennigan 28 Jul '09

28 Jul '09

We're getting cyclops[1] alerts that AS13214 is advertising itself as origin for all of our prefixes. Their anomaly report shows thousands of prefixes originating there. Anyone else seeing evidence of this or being affected? [1] http://cyclops.cs.ucla.edu/ -- Jay Hennigan - CCIE #7880 - Network Engineering - jay(a)impulse.net Impulse Internet Service - http://www.impulse.net/ Your local telephone and internet company - 805 884-6323 - WB6RDV

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Re: Re: What is the most standard subnet length on internet
by 정치영 26 Jul '09

26 Jul '09

Hi all, I appreciate many people gave me advices, Some of persons asked me about my questions, I'm sorry for that I couldn't reply to everyone. Because of your help, I could get many opinions and standards regarding IP allocation policy. by the way, in APNIC's IP allocation sizes policy, there is a comments like below. "Below are the minimum sizes for allocations and assignments, This information is provided at the request of the ISP community to assist in filtering policy decisions " Currently, is there any provider filtering routes under LIR's minimum allocation size such as /22 ? Best regards, ============================================= Chi-Young Joung SAMSUNG NETWORKS Inc. Email: lionair(a)samsung.com Tel +82 70 7015 0623, Mobile +82 17 520 9193 Fax +82 70 7016 0031 ============================================= ------- Original Message ------- Sender : Danny McPherson<danny(a)tcb.net> Date : 2008-12-21 02:42 (GMT+09:00) Title : Re: What is the most standard subnet length on internet On Dec 18, 2008, at 9:43 PM, 정치영 wrote: > Suresh, > > Yes, I guess my concern is close to the second meaning. > > It seems so simple. Currently annoucement of /24 seems to be okey, > most upstream providers accept this. > However I wonder if there is any ground rule based on any standard > or official recommandation. > If there is some standardized rule about prefix length to be > annouced, I will make my bgp & IP allocation policy of > each data center of my company, and I will be able to more fairly > and squarely speak to my customer like this > "You have to change your server's IP address if you want move your > server to other place" Some useful guidance is provided here (and in subsequent references) as well: An Architecture for IP Address Allocation with CIDR <http://tools.ietf.org/html/rfc1518> Classless Inter-Domain Routing (CIDR): an Address Assignment and Aggregation Strategy <http://tools.ietf.org/html/rfc1519> Network Renumbering Overview <http://tools.ietf.org/html/rfc2071> A Framework for Inter-Domain Route Aggregation <http://tools.ietf.org/html/rfc2519> HTH, -danny

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ISP best practices
by Philip Lavine 28 Jun '09

28 Jun '09

To all, I am sure this has been asked 10 to the 1 millionth power times, however may be the rules have changed. I am looking to set up a really small ISP with a few /24's. I want to host DNS as well. Is there any whitepapers/howtos/best practices on setting up multihomed BGP and DNS with BIND so I don't blow up the Internet. Thx Philip

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Cisco 6524 and MTU
by Warren Bailey 03 Jun '09

03 Jun '09

Has anyone encountered a 6524 dropping packets larger than 1492? IOS 12.2(33)SXH2a Warren Bailey GCI Communication Corp. RF Network Engineering 907.868.5911 office 907.903.5410 mobile

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Issues through ATT core/backbone
by Veerender Attri 03 Jun '09

03 Jun '09

We have a few circuits with ATT and a few VZ. Since friday we have seen serveral intermittent issues throught ATT to reach various customers and our various remote offices. If we swing the traffic through VZ interfaces using static routes we can reach those locations fine. We were doing traceroutes during the issue and we saw the traceroutes dying inside ATT network. I was wondering if any one else saw similar issues ? On friday we saw issue between ATT and GBLX peering point. We saw similar issue on tuesday. And another one today. We sent to ATT various traceroutes and opened a few tickets but didnt really get any kind of confirmation. The problem seems to remedy itself on its own after 10-30 minutes. Please chime in if any one else saw similar issues transiting through AT&T or global crossing.

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Savvis quality?
by David Hubbard 03 Jun '09

03 Jun '09

Just wondering if anyone can tell me their opinion on Savvis bandwidth/company preferably from a web host perspective. Considering a connection. Thanks, David

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Huawei cx300
by Jack Kohn 02 Jun '09

02 Jun '09

Guys, Anybody any experience with VPLS on Huawei cx300? Jack

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