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Re: Contention/Oversubscription maths

On 27/05/2011 15:23, Jay Ashworth wrote: - Original Message - From: "Adam Armstrong" Residence customers will tolerate a lot more oversubscription than business, enterprise, and server going on down the list of oversubscription, but happily *up* the list of "how mu

Re: Contention/Oversubscription maths

On 27/05/2011 15:49, Shaun Bryant wrote: I run a WISP, where we have moved customers from 3mb/s to 8mb/s to 20mb/s over the course of 5 years. We do this one tower at a time (about 150 customers) what we have learned is usage grows overtime not with the increase in available bandwidth. Our Per

Re: Contention/Oversubscription maths

On 27/05/2011 14:40, Jacob Broussard wrote: We offer peak speeds of 4mbps, and we have an extrordinary amount of people using (abusing as some would say) streaming video for many hours of the day causing headaches for us. You probably would be safe to assume that you can use a higher ratio f

Re: Contention/Oversubscription maths

On 27/05/2011 14:02, Jacob Broussard wrote: I don't use almost any bandwidth outside of Netflix, Steam game downloads, and getting my daily dose of streaming starcraft videos and ntop tells me I averaged 1.7mbps over the last month. Mind you this is on an 8mbps peak connection. With peak sp

Re: Contention/Oversubscription maths

On 27/05/2011 13:45, Jared Mauch wrote: On May 27, 2011, at 8:14 AM, Adam Armstrong wrote: No SLA, residential customers. I would watch out for the 'abusers' in this case, and have the capability to rate-limit the ports if necessary. Some hardware doesn't deal well with &#x

Re: Contention/Oversubscription maths

On 27/05/2011 13:44, Jeroen van Ingen wrote: Hi Adam, I'm talking of 1000 users on the end of a 1GE, not 50,000. I don't think either of these scenarios are worrying. 300MB takes<3seconds on 1GE or 30 seconds on 100M. I don't think those kinds of events will have an appreciable effect on the p

Re: Contention/Oversubscription maths

On 27/05/2011 03:12, valdis.kletni...@vt.edu wrote: On Thu, 26 May 2011 23:48:48 BST, Adam Armstrong said: Finally, what do people think of selling a 1G service with 1G backhaul (and potentially 10s or 100s of customers buying this service alongside n*100s of customers with 100M service

Re: Contention/Oversubscription maths

On 27/05/2011 03:45, Dobbins, Roland wrote: On May 27, 2011, at 9:12 AM, wrote: What do you do on Patch Tuesday? For that matter, what do you do when the latest 'cool' YouTube video go viral, or Amazon offer the next Lady GaGa album on sale for $0.99, or people with iDevices download th

Contention/Oversubscription maths

Hi All, Do any of you have any pointers on how to go about predicting usage for high-speed ethernet access? I'm running 1GE links into buildings, and hanging many (100-1000) 100M customers off switches in the basement, simple enough. I'm assuming ~300Kbps average peak usage per customer, bu

Re: Switch with 24x SFP PVLAN QinQ Layer 2

On 02/03/2011 19:19, James Brown wrote: On Wed, Mar 2, 2011 at 1:26 PM, Rubens Kuhl > wrote: > Requirements are basically just 24/48 SFP ports, PVLAN and selective QinQ. > Most devices that fit the requirements are Layer 3, which pushes the cost >

Re: Switch with 24x SFP PVLAN QinQ Layer 2

On 02/03/2011 18:26, Rubens Kuhl wrote: Requirements are basically just 24/48 SFP ports, PVLAN and selective QinQ. Most devices that fit the requirements are Layer 3, which pushes the cost per port too high. Cisco ME6524 has a model with 32 SFP ports (24 with 3:1 oversubscription, 8 non-oversubs

Switch with 24x SFP PVLAN QinQ Layer 2

Hi All, I'm scouring the Internet for potential devices to use in a FTTB/FTTP scenario. Requirements are basically just 24/48 SFP ports, PVLAN and selective QinQ. Most devices that fit the requirements are Layer 3, which pushes the cost per port too high. Has anyone come across anything I'

Re: Failure modes: NAT vs SPI

This thread makes me sad. adam. On 03/02/2011 19:09, Jay Ashworth wrote: - Original Message - From: "Owen DeLong" On Feb 3, 2011, at 8:29 AM, Jay Ashworth wrote: This is the crux of the argument I've been trying, rather ineptly, to make: when it breaks, *which way does it fail*. NAT f

Re: Routers in Data Centers

On 24/09/2010 11:22, Venkatesh Sriram wrote: Hi, Can somebody educate me on (or pass some pointers) what differentiates a router operating and optimized for data centers versus, say a router work in the metro ethernet space? What is it thats required for routers operating in data centers? High

Re: Monitoring Tools

On 19/08/2010 10:23, jacob miller wrote: Am looking for an opensource network monitoring tool with ability to create different views for different users. You could try our mildly unconventional NMS project : http://www.observium.org We try to focus on collection and presentation of informati

Re: BCP38 exceptions for RFC1918 space

On 15/08/2010 18:02, Florian Weimer wrote: * Valdis Kletnieks: On Sun, 15 Aug 2010 18:46:49 +0200, Florian Weimer said: And that connection that's trying to use PMTU got established across the commodity internet, how, exactly? ;) ICMP "fragmentation needed, but DF set" messages carry the a

Re: Web expert on his 'catastrophe' key for the internet

On 28/07/2010 15:17, Tony Finch wrote: On Tue, 27 Jul 2010, Joe Greco wrote: Weren't the FCC and at&t recently suggesting that VoIP was the future of telephony? BT are currently upgrading the UK's phone system to VOIP. But it's running on a private network. Aren't BT still failing to trust

Re: Google wants your Internet to be faster

On 09/08/2010 00:21, Mark Boolootian wrote: Cringely has a theory and it involves Google and Verizon, but it doesn't involve net neutrality: http://www.nytimes.com/2010/08/08/opinion/08cringeley.html?_r=2 I'd assumed this would have been everyone's guess when the stories first appeared.

Re: Arrogant RBL list maintainers

On 16/12/2009 06:12, James Hess wrote: On Tue, Dec 15, 2009 at 11:30 PM, Adam Armstrong wrote: personally, i'd recommend not being a dick and setting valid *meaningful* reverse dns for things relaying mail. Many sites don't use names that will necessarily be meanin

Re: Arrogant RBL list maintainers

On 09/12/2009 15:18, Sven Olaf Kamphuis wrote: a84-22-xx-xx.cb3rob.net. as it's RFC complient and we cannot be fucked to haha. and what precisely did you expect? that's not really what most people would consider valid reverse dns for a mail relay. (operational practice often beats RFC whe

Re: Failover how much complexity will it add?

Ken Gilmour wrote: Hi Adel There are companies like packet exchange (www.packetexchange.net) (whom i have personally used) who will do all of the legwork for you, such as applying for the ASN, address space, transit agreements, and get the tail connections directly to your building. You just nee

Re: Small guys with BGP issues

Steve Bertrand wrote: I'm venting. I'm allowed to vent here. I think I'm qualified to do so Sorry, this is not facebook. You're not allowed to randomly splurt inane and unexplaned rants and complaints. At the very least it makes you look stupid to your peers, and at worst it will harm your fu

Re: ISP customer assignments

eric clark wrote: So far, I have only dabbled with IPv6, but my reading of the RFCs is that VLSM for lengths beyond /64 is not required. Subsequently, to use anything longer is an enormous gamble in an enterprise environment. I envision upgrading code one day and finding that your /127 isn't supp

Re: Cisco 6524 and MTU

We have good results carrying >1492 packets across 6524s running both ZU2 and SXI1. I do consider ZU2 to be broken though (ghost route issue). SXI1 behaves well for us. adam. We use Cisco 6524s with packets up to 1546 bytes with no issues. IOS ZU2, but we are testing SXI1 with no MTU issues

Re: NPE-G2 vs. Sup720-3BXL

Julio Arruda wrote: Steve Dalberg wrote: 2009/5/18 Adam Armstrong : David Storandt wrote: We're stuck in an engineering pickle, so some experience from this crew would be useful in tie-breaking... We operate a business-grade FTTx ISP with ~75 customers and 800Mbps of Internet tr

Re: NPE-G2 vs. Sup720-3BXL

David Storandt wrote: We're stuck in an engineering pickle, so some experience from this crew would be useful in tie-breaking... We operate a business-grade FTTx ISP with ~75 customers and 800Mbps of Internet traffic, currently using 6509/Sup2s for core routing and port aggregation. The MSFC2s a

Re: Documentation of switch maps

Blake Pfankuch wrote: Howdy. Had a customer come to me this morning who wanted to create a document for their switching infrastructure and thought I would bounce it off the rest of the world on how you usually do this. Typically I use a spreadsheet with outlines to define the "switch" and th

Re: Network equipments process utilization

Elmar K. Bins wrote: h...@efes.iucc.ac.il (Hank Nussbacher) wrote: - slow-CPU boxes like everything Cisco with SUPs, since the CPU load _always_ jumps to 100% for short periods of time - BGP needs something calculated ;-) I get interested whenever CPU load _stays_ high Yeah

Re: IPv6: IS-IS or OSPFv3

TJ wrote: ... not to mention that fact that IS-IS is, IMHO, a much nicer IGP to work with. WRT that last sentence, that is an almost religious debate I was trying to avoid starting ... :) Well IMHO it's a very important point to consider. This is a great chance to switch your IGP, if y

Re: IPv6: IS-IS or OSPFv3

TJ wrote: I do have some confusion about which one is better for IPv6 in Service Provider networks as far as IP routing and MPLS application is concern! General rule of thumb - use whichever you / your operation is most familiar with. Using IS-IS today, use it for IPv6. Using O

Re: Net Mgmt Tools and supporting OS

Adam Armstrong wrote: Things I'd look at would be RANCID, Cricket + genrtrconfig, Cacti, jffnms, mon from kernel.org, Nagios, ZenOSS, OpenNMS and my own NMS, Observer (http://www.observer.org). I may have meant http://www.project-observer.org :) adam.

Re: Net Mgmt Tools and supporting OS

Hi Vitto, The tools you use depend massively on the kind of network you're building. Things I'd look at would be RANCID, Cricket + genrtrconfig, Cacti, jffnms, mon from kernel.org, Nagios, ZenOSS, OpenNMS and my own NMS, Observer (http://www.observer.org). You'll find lots of help with all o

Re: Peering - Benefits?

HRH Sven Olaf Prinz von CyberBunker-Kamphuis MP wrote: internet exchanges are not per-se "redundant" they basically are a switch which actually, because of the many connected parties, most of which do not have enough PAID transit to cover any outages on it, causes more problems than they are good

Re: Peering - Benefits?

Sure, but we're talking about settlement-free peering. He's only expecting to be able to reach his peer's subnets and perhaps those of his peer's customers. If he peers with ASx in two locations, he does have redundant connections to ASx's tiny corner of the internet. adam. But if that AS is

Ericsson / Marconi AHX ADSL2+

Hi All, Are any of you using Marconi/Ericsson AXH 2500 (or similar) MSANs for ADSL2+? Does anyone know much about setting up ADSL2+ to operate stabily with fastpath (trellis off) and adaptive runtime on? Any offlist help would be much appreciated! Thanks, adam.

Re: Software router state of the art

Adrian Chadd wrote: On Wed, Jul 23, 2008, Charles Wyble wrote: Sure its not a CRS-1, but reliably doing a mil pps with a smattering of low-touch features would be rather useful, no? (Then, add say, l2tp/ppp into that mix, just as a crazy on-topic example..) Sounds like a Juniper J-series. H

NMS for Carriers

Hi All, We're kicking off a project to find a new NMS and I thought you guys might have some helpful advice. We're a smallish telco (on an island, infact) so we have a very wide range of kit to monitor, from servers to routers to dslams and all that dirty voice stuff. Which software are yo

Re: OS, Hardware, Network - Logging, Monitoring, and Alerting

et my head around the alerting bit, so it remains a little unfinished! My personal opinion is that all of the FOSS NMS solutions are sorely disappointing, Observer included. It seems to be something that no one has quite gotten right yet! Adam. On Fri, Jun 27, 2008 at 11:42 AM, Adam Armstro

Re: OS, Hardware, Network - Logging, Monitoring, and Alerting

Rev. Jeffrey Paul wrote: Hi. I've a (theoretically) simple problem and I'm wondering how others solve it. I've recently deployed ~40 Linux instances on ~20 different Dell blades and PowerEdges (we're big on virtualization), a few 7204s and 3560s, and assorted switchable PDUs and whatnot. We