Re: Does Internet Speed Vary by Season?
Hank Nussbacher wrote: http://www.wired.com/gadgets/miscellaneous/magazine/17-10/ts_burningquestion It's an interesting theory, that temperature affects overall throughput. Their assumptions on other conditions that affect bandwidth consumption are off IMHO. Our own data directly refutes what Wired reported in this article. Summertime is our most heavily utilized months on our network on average. For SPs heavily laden with residential subs I think this is probably the norm. Then school starts and you have a pronounced drop in traffic (that includes a major dip when college begins and again when primary school begins). The rates slowly increase back to their summer time highs until the holiday season begins where they either remain steady or taper off slightly. The theory here is that the high-bandwidth users are too busy with holiday affairs to play games, download music/porn, etc. That is until after X-mas when consumption suddenly spikes in a very pronounced way (new computers for X-mas). This also corresponds to our biggest month for new service turnups and speed increases in our bundles. Late winter varies from fairly constant to slight growth. Our single biggest days are the ones proceeding a major winter storm, or if the storm doesn't cut power to large swaths of our service area then the days in the middle of the winter storms come out on top. Spring growth depends on the weather. Good weather means less consumption for us. Bad weather means more consumption. Our least busy month is May when the kids are the most busy. June and July again show a major turn around. Bandwidth consumption is directly tied to your user demographics. If your SP is primarily business circuit then your traffic patterns will vary wildly from that of a SP with primarily residential circuits. Every SP is a little bit different. That's why some SPs set personal records for bandwidth consumption when Michael Jackson's memorial service was broadcast (including SPs less than an hour away from me) and other SPs (mine for example) didn't have a single user stream the broadcast and otherwise had a normal bandwidth day. Other than Wired making an assumption that all SPs have nearly identical traffic patterns, the article is otherwise ok. Justin
Re: Dutch ISPs to collaborate and take responsibility
On Wednesday 07 October 2009 00:27:55 Joe Greco wrote: Assuming that the existence of an infected PC in the mix translates to some sort of inability to make a 911 call correctly is, however, simply irresponsible, and at some point, is probably asking for trouble. ... JG Also, someone mentioned that the FCC doesn't in fact mandate that PSTN terminals should be able to make emergency calls even if formally disconnected and asked about cellular. The opposite is true about GSM and its descendants; whether or not you're a valid roamer for the network you're talking to, have a prepaid balance, have paid your bill, you must be able to make emergency calls. Similarly, even if no SIM card is present, the device should register with the network as limited service - i.e. emergency only. signature.asc Description: This is a digitally signed message part.
Re: Does Internet Speed Vary by Season?
On Oct 7, 2009, at 6:44 AM, Hank Nussbacher wrote: http://www.wired.com/gadgets/miscellaneous/magazine/17-10/ts_burningquestion I'm not sure the effects are so big compared to the actual speed that they are noticable for the average user. We also don't have any proper data available but we do (operating in NL) notice from time to time that periods with loads of rain can have influence on the stabillity and speed of DSL lines especially in older areas of towns where they still have paper/lead covered cabling instead of more modern PVC isolation. This as more visible when everybody still used 56k dialup.This may as well be a very local effect, the western part of our country is largely at or even below sealevel and very wet already. However as these effects might get you a few kilobits extra from time to time that effect is not visible in overall usage statisctics, as soon as the sun comes out we see traffic levels drop to only rise again near september when everybody is back to school and the office. As far as traffic levels go, it's the rainy winter nights which make it into the recordbooks. Grtx, Marco
Re: Dutch ISPs to collaborate and take responsibility
Alexander Harrowell wrote: On Wednesday 07 October 2009 00:27:55 Joe Greco wrote: Assuming that the existence of an infected PC in the mix translates to some sort of inability to make a 911 call correctly is, however, simply irresponsible, and at some point, is probably asking for trouble. ... JG Also, someone mentioned that the FCC doesn't in fact mandate that PSTN terminals should be able to make emergency calls even if formally disconnected and asked about cellular. The opposite is true about GSM and its descendants; whether or not you're a valid roamer for the network you're talking to, have a prepaid balance, have paid your bill, you must be able to make emergency calls. Similarly, even if no SIM card is present, the device should register with the network as limited service - i.e. emergency only. The FCC generally doesn't come into play when you're talking about ILEC telephone service except at a very high level. In California, by PUC regulation telephone companies are required to allow access to 911 so long as there is copper in the facility and it was, at any time, active with any sort of phone service. Ref: http://ucan.org/telenforcers/files/SBC%20complaint%20PUC%20version.pdf Ref2: http://law.onecle.com/california/utilities/2883.html I believe this is also the case in numerous other states.
Re: Does Internet Speed Vary by Season?
:- Hank == Hank Nussbacher h...@efes.iucc.ac.il writes: http://www.wired.com/gadgets/miscellaneous/magazine/17-10/ts_burningquestion -Hank There are TXCOs and OXCOs inside equipment for a reason. And rubidium lamps as well, sometimes. Seasonal variations in usage from the end customers are a fact of life, instead. If your net is large enough you can even spot the different habits about vacations, holidays and whatnot across the different regions. Pf -- --- Pierfrancesco Caci | Network System Administrator - INOC-DBA: 6762*PFC p.c...@seabone.net | Telecom Italia Sparkle - http://etabeta.noc.seabone.net/
Re: Does Internet Speed Vary by Season?
On Oct 7, 2009, at 9:26 AM, Pierfrancesco Caci wrote: :- Hank == Hank Nussbacher h...@efes.iucc.ac.il writes: http://www.wired.com/gadgets/miscellaneous/magazine/17-10/ts_burningquestion -Hank There are TXCOs and OXCOs inside equipment for a reason. And rubidium lamps as well, sometimes. Seasonal variations in usage from the end customers are a fact of life, instead. If your net is large enough you can even spot the different habits about vacations, holidays and whatnot across the different regions. I read the article and the follow up posts and I wonder if we are all using the same definition for speed here. The article seems to imply you don't get 6 Mbps on your DSL line in summer because the copper is hotter and it's harder to push electrons down the link. That is clearly BS, the clock is ticking six million times per second, period. Then it talks about traffic, which is very different than speed, at least in my book. If the intertubes are congested, you might get less throughput, but your speed is the same. And congestion cannot affect speed. That laser is blinking at 10 billion times per second whether the queue behind the port is full or not. (And don't tell me the laser is quiescent when the queue is empty, you know what I mean.) So what are are talking here? Speed, throughput, congestion, packet loss, latency ... ? Oh, and while I am certain it is true different networks see different peaks valleys for different seasons times of day, the Internet (whatever the hell that is) definitely has less traffic in summer than fall. -- TTFN, patrick
Re: Up Next: Quarantine Phishing (Was: Dutch ISPs to collaborate and take responsibility for bottedclients)
On Tue, 6 Oct 2009, Jeroen Massar wrote: The problem with all of that boils down to what people have to believe... and how to properly inform them of that... How many people remember this oldie, but goodie? 3.3.2.1.1 Trusted Path The TCB shall support a trusted communication path between itself and users for use when a positive TCB-touser connection is required (e.g., login, change subject security level). Communications via this trusted path shall be activated exclusively by a user of the TCB and shall be logically isolated and unmistakably distinguishable from other paths. Its simple to say, hard to do.
Re: Does Internet Speed Vary by Season?
I read the article and the follow up posts and I wonder if we are all using the same definition for speed here. The article seems to imply you don't get 6 Mbps on your DSL line in summer because the copper is hotter and it's harder to push electrons down the link. That is clearly BS, the clock is ticking six million times per second, period. Are you trying to say that the *actual* DSL speed, as synchronised between the modems at either end, is neither a) affected by the physical characteristics of the copper pair, nor b) variable? I agree the article is woolly between line-speed, throughput, goodput, congestion, etc, but to say that DSL line speed is in any way fixed in the same way that Ethernet or PDH / SDH lines are is contrary to every DSL platform I've worked with. (Also, 6Mb/s DSL doesn't equate to 6 million ticks per second in anything relating to pushing electrons onto the wire. Remember, it's modem technology, just faster - your baud rate is still much lower than your bps.) Regards, Tim.
Re: Does Internet Speed Vary by Season?
http://www.wired.com/gadgets/miscellaneous/magazine/17-10/ts_burningquestion It used to be that we would notice this, except that it had everything to do with temperature *and* dampness. In the '90's, it was still quite common for a lot of older outside plant to be really only voice grade and it wasn't unusual for copper to run all the way back to the CO, through a variety of taps and splice points. Even though Ma Bell would typically do a careful job handling their copper, the sheer number of potential points of failure meant that it wasn't unusual for water to infiltrate and penetrate. If I recall correctly, the worst was usually a long, hard cold rain (hey we're in Wisconsin) after which people who had been getting solidly high speed modem connects would see a somewhat slower speed. ... 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.
RE: Does Internet Speed Vary by Season?
Trying to pinpoint the failure point on one of those circuits is a PITA as well. Getting a telco tech out to test on a circuit that only goes down when it rains is an exercise that Sisyphus would probably decline. Network Engineer, JNCIS-M 214-981-1954 (office) 214-642-4075 (cell) jbrash...@hq.speakeasy.net http://www.speakeasy.net -Original Message- From: Joe Greco [mailto:jgr...@ns.sol.net] Sent: Wednesday, October 07, 2009 9:49 AM To: Hank Nussbacher Cc: nanog@nanog.org Subject: Re: Does Internet Speed Vary by Season? http://www.wired.com/gadgets/miscellaneous/magazine/17-10/ts_burningquestion It used to be that we would notice this, except that it had everything to do with temperature *and* dampness. In the '90's, it was still quite common for a lot of older outside plant to be really only voice grade and it wasn't unusual for copper to run all the way back to the CO, through a variety of taps and splice points. Even though Ma Bell would typically do a careful job handling their copper, the sheer number of potential points of failure meant that it wasn't unusual for water to infiltrate and penetrate. If I recall correctly, the worst was usually a long, hard cold rain (hey we're in Wisconsin) after which people who had been getting solidly high speed modem connects would see a somewhat slower speed. ... 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.
Re: Does Internet Speed Vary by Season?
On Oct 7, 2009, at 10:52 AM, Scott Howard wrote: On Wed, Oct 7, 2009 at 7:16 AM, Patrick W. Gilmore patr...@ianai.net wrote: I read the article and the follow up posts and I wonder if we are all using the same definition for speed here. The article seems to imply you don't get 6 Mbps on your DSL line in summer because the copper is hotter and it's harder to push electrons down the link. That is clearly BS, the clock is ticking six million times per second, period. So you're saying that if I put in an 8Mbps ADSL1 connection, then I'm going to get a guaranteed 8Mbps point-to-point back to the exchange, regardless of the quality of my phone line, or the distance from the exchange? Yes, everyone, I was imprecise. Please tell me all about baud and variability and such. Because that was the point I was trying to make. That laser is blinking at 10 billion times per second whether the queue behind the port is full or not. (And don't tell me the laser is quiescent when the queue is empty, you know what I mean.) Laser? Perhaps this is a different type of ADSL than most people here are used to? (I'm not saying that the article is right, but...) I admit I totally spaced on the fact DSL != ethernet when I was typing the first paragraph. But when I wrote the above, I actually thought to myself: I better mention I'm talking about a 10G backbone link... nah, everyone on NANOG is smart enough to figure out what I meant. End of day, the point stands that the article is worse than useless as it does not add data to the general knowledge pool, but actually makes everyone dumber for reading it. Apparently it even made me forget how DSL works -- TTFN, patrick
Re: Does Internet Speed Vary by Season?
No, I did not read the article . . . But, . . . Yes, DSL speed varies by season . . . or rather, temperature. But, this is really only the case for _aerial_copper_plant. Buried plant is nearly the same temperature year round. Copper pair resistance changes with temperature. And, therefore, the link speed of DSL will change depending upon the time of the year (temperature) and geographic location. If there is a difference of but a few degrees of temperature year round, then no there will be no difference. But, if you live in the desert southwest or even the mid-west where the temperatures can be 70-120 degrees different between seasons or even 40-70 degrees different between night and day . . . you are going to have pronounced differences in link speed. Worst cast, your link speed might vary 10-20%. The longer the cable length from the central office, the more the variance will be. But, this is something that must be measured on a case by case basis. And, since much of the aerial plant has been replaced with buried plant, this really isn't much of a problem anymore. BBC Joe Greco wrote: http://www.wired.com/gadgets/miscellaneous/magazine/17-10/ts_burningquestion It used to be that we would notice this, except that it had everything to do with temperature *and* dampness. In the '90's, it was still quite common for a lot of older outside plant to be really only voice grade and it wasn't unusual for copper to run all the way back to the CO, through a variety of taps and splice points. Even though Ma Bell would typically do a careful job handling their copper, the sheer number of potential points of failure meant that it wasn't unusual for water to infiltrate and penetrate. If I recall correctly, the worst was usually a long, hard cold rain (hey we're in Wisconsin) after which people who had been getting solidly high speed modem connects would see a somewhat slower speed. ... JG
Re: Dutch ISPs to collaborate and take responsibility
On Oct 6, 2009, at 4:27 PM, Joe Greco wrote: Someone else pointed out that if the system in question has been botted/owned/pwn3d/whatever you want to call it, then, you can't guarantee it would make the 911 call correctly anyway. I realize that many NANOG'ers don't actually use the technologies that we talk about, so I'm just going to correct this: You seem to be under the mistaken assumption that most people using VoIP do so using their computer. While it kind of started out that way years ago, it simply isn't so anymore. Most VoIP services can be configured to work with an analog telephony adapter, providing a POTS jack. Most VoIP services even provide one as part of the subscription, sometimes for a fee. I do use VOIP, bot computer and non-computer based. None the less, the fact remains that should any of my systems become compromised, my ability to make a VOIP phone call is in doubt regardless of what the provider does. Well, /that's/ obviously not true. Cable providers are already using PacketCable NCS (read: MGCP lightly modified) to provide completely reliable QoS for their own VoIP-to-the-cablemodem products; you are going to find it tough to impact the service level of such a device. For general VoIP, there's no particularly good reason that the VoIP traffic cannot be QoS'd / filtered to allow VoIP to continue to work while gardening the remaining traffic from the customer. That is completely under the provider's control. Since many of the CPE devices actually have a programmable hardware ethernet switch, it is even possible to do a lot of the work in hardware. Additionally the problems of DDOS sourced from a collection of compromised hosts could be interfering with someone else's ability to make a successful VOIP call. I think the above addresses that. There are always risks, of course. The guy pruning tree branches down the street can knock down the cable line, for example. Of course, he probably takes out the phone lines as well... :-) Abuse sources should be blocked from impacting the rest of the network. Sure. This blocking should be as narrow as possible. Yes, that's my point. We should be able to narrowly block compromised hosts so that we don't screw up legitimate VoIP uses. ... 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.
Re: Does Internet Speed Vary by Season?
Scott Howard wrote: snip So you're saying that if I put in an 8Mbps ADSL1 connection, then I'm going to get a guaranteed 8Mbps point-to-point back to the exchange, regardless of the quality of my phone line, or the distance from the exchange? snip (I'm not saying that the article is right, but...) ADSL systems will retrain to a lower rate as line conditions (SNR) change for the worse. The attentuation characteristics of a given pair will change of time due to a number of factor, including but not certainly limited to physical wear, moisture invasion, localized source of interference, sunspot activity etc. Are dsl plants subject to localized environmental conditions? Absolutely. Scott
Re: Does Internet Speed Vary by Season?
No, I did not read the article . . . But, . . . Yes, DSL speed varies by season . . . or rather, temperature. But, this is really only the case for _aerial_copper_plant. Buried plant is nearly the same temperature year round. Yes, but it is more susceptible to long-term water infiltration, which leads to longer-term speed drops. This is actually more difficult to work with and test for. Copper pair resistance changes with temperature. And, therefore, the link speed of DSL will change depending upon the time of the year (temperature) and geographic location. If there is a difference of but a few degrees of temperature year round, then no there will be no difference. But, if you live in the desert southwest or even the mid-west where the temperatures can be 70-120 degrees different between seasons or even 40-70 degrees different between night and day . . . you are going to have pronounced differences in link speed. You might. Or you might not. Around here, it's not unusual to see a difference of a hundred degrees between summer and winter. Speaking from a few decades of experience working with telecom up here, I'd be tempted to say that either a circuit tends towards being problematic or towards being reliable, and that where I've been able to ascertain enough facts, there's a correlation with the age of the outdoor plant- but that's only a loose correlation. Worst cast, your link speed might vary 10-20%. The longer the cable length from the central office, the more the variance will be. But, this is something that must be measured on a case by case basis. And, since much of the aerial plant has been replaced with buried plant, this really isn't much of a problem anymore. Buried plant mostly has more consistent (maybe less severe) problems, IMHO. ... 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.
Re: Practical numbers for IPv6 allocations
David Conrad wrote: On Oct 6, 2009, at 6:13 PM, Nathan Ward wrote: My understanding is that the RIRs are doing sparse allocation, as opposed to reserving a few bits. I could be wrong. Last I heard, with the exception of APNIC and contrary to what they indicated they'd do prior to IANA allocating the /12s, you are indeed wrong. I'd be happy to hear things have changed. Only APNIC is doing bisection style assignments today: 20091001|apnic|AU|ipv6|2402:c00::|32|allocated 20091001|apnic|SG|ipv6|2402:400::|32|allocated 20091005|apnic|JP|ipv6|2402:1400::|32|allocated 20091006|apnic|NZ|ipv6|2402:1c00::|32|allocated 20090930|arin|US|ipv6|2607:fd70::|32|allocated 20090930|arin|CA|ipv6|2607:fd78::|32|allocated 20091001|arin|US|ipv6|2607:fd80::|32|allocated 20091006|arin|US|ipv6|2607:fd88::|32|allocated 20091005|ripencc|RU|ipv6|2a00:1440::|32|allocated 20091005|ripencc|SI|ipv6|2a00:1448::|32|allocated 20091005|ripencc|IE|ipv6|2a00:1450::|32|allocated 20091005|ripencc|BE|ipv6|2a00:1458::|32|allocated 20090709|lacnic|PY|ipv6|2800:3a0::|32|allocated 20090714|lacnic|CL|ipv6|2800:3b0::|32|allocated 20090807|lacnic|GY|ipv6|2800:3c0::|32|allocated 20090903|lacnic|AR|ipv6|2800:3d0::|32|allocated 20090708|afrinic|GH|ipv6|2001:43c0::|32|allocated 20090729|afrinic|EG|ipv6|2001:43c8::|32|allocated 20090813|afrinic|KE|ipv6|2001:43d0::|32|allocated 20090909|afrinic|ZA|ipv6|2001:43d8::|32|allocated - Kevin
Help - Unable to builld a IP-SEC VPN on a Cisco ASA 5520
Group, I am stuck like chuck. We are unable to activate a VPN in one of the virtual firewall context. Under the crypto commands, none of the IP-sec are available. Any help on this would be appreciated. Version we running is 8.0(4) Michael Ruiz mr...@telwestservices.com mailto::mr...@telwestservices.com
Re: Help - Unable to builld a IP-SEC VPN on a Cisco ASA 5520
Call 1-800-553-2447, they should be able to help. On Wed, Oct 7, 2009 at 9:56 AM, Michael Ruiz mr...@telwestservices.comwrote: Group, I am stuck like chuck. We are unable to activate a VPN in one of the virtual firewall context. Under the crypto commands, none of the IP-sec are available. Any help on this would be appreciated. Version we running is 8.0(4) Michael Ruiz mr...@telwestservices.com mailto::mr...@telwestservices.com
RE: Help - Unable to builld a IP-SEC VPN on a Cisco ASA 5520
IPsec isn't available when in multiple context mode. -Original Message- From: Michael Ruiz [mailto:mr...@telwestservices.com] Sent: Wednesday, October 07, 2009 12:56 PM To: nanog@nanog.org Subject: Help - Unable to builld a IP-SEC VPN on a Cisco ASA 5520 Group, I am stuck like chuck. We are unable to activate a VPN in one of the virtual firewall context. Under the crypto commands, none of the IP-sec are available. Any help on this would be appreciated. Version we running is 8.0(4) Michael Ruiz mr...@telwestservices.com mailto::mr...@telwestservices.com This communication is intended solely for the addressee and is confidential and not for third party unauthorized distribution
Re: Help - Unable to builld a IP-SEC VPN on a Cisco ASA 5520
Michael Ruiz wrote: Group, I am stuck like chuck. We are unable to activate a VPN in one of the virtual firewall context. Under the crypto commands, none of the IP-sec are available. Any help on this would be appreciated. Version we running is 8.0(4) Isn't VPN only available in single-context mode?
RE: Help - Unable to builld a IP-SEC VPN on a Cisco ASA 5520
I was in ASA class just last week and asked about this exact issue. I was told that at this time you cannot do the IPSec VPN in Multiple context mode (due to the ASA not being able to keep track of the SA). This is a software issue that Cisco is working on and has in test at this time. No timeframe for release though. -John -Original Message- From: Jason Bertoch [mailto:ja...@i6ix.com] Sent: Wednesday, October 07, 2009 1:03 PM To: nanog@nanog.org Subject: Re: Help - Unable to builld a IP-SEC VPN on a Cisco ASA 5520 Michael Ruiz wrote: Group, I am stuck like chuck. We are unable to activate a VPN in one of the virtual firewall context. Under the crypto commands, none of the IP-sec are available. Any help on this would be appreciated. Version we running is 8.0(4) Isn't VPN only available in single-context mode?
Re: Help - Unable to builld a IP-SEC VPN on a Cisco ASA 5520
yup you lose alot in mutli context mode such as vpn, and routing protocols. It basically just becomes a true stateful firewall. On Wed, Oct 7, 2009 at 1:26 PM, John Hodges jhod...@simplexity.com wrote: I was in ASA class just last week and asked about this exact issue. I was told that at this time you cannot do the IPSec VPN in Multiple context mode (due to the ASA not being able to keep track of the SA). This is a software issue that Cisco is working on and has in test at this time. No timeframe for release though. -John -Original Message- From: Jason Bertoch [mailto:ja...@i6ix.com] Sent: Wednesday, October 07, 2009 1:03 PM To: nanog@nanog.org Subject: Re: Help - Unable to builld a IP-SEC VPN on a Cisco ASA 5520 Michael Ruiz wrote: Group, I am stuck like chuck. We are unable to activate a VPN in one of the virtual firewall context. Under the crypto commands, none of the IP-sec are available. Any help on this would be appreciated. Version we running is 8.0(4) Isn't VPN only available in single-context mode?
Re: Help - Unable to builld a IP-SEC VPN on a Cisco ASA 5520
Does Juniper firewall has same issue? Devang Patel On Oct 7, 2009, at 11:29 AM, Dane Newman dane.new...@gmail.com wrote: yup you lose alot in mutli context mode such as vpn, and routing protocols. It basically just becomes a true stateful firewall. On Wed, Oct 7, 2009 at 1:26 PM, John Hodges jhod...@simplexity.com wrote: I was in ASA class just last week and asked about this exact issue. I was told that at this time you cannot do the IPSec VPN in Multiple context mode (due to the ASA not being able to keep track of the SA). This is a software issue that Cisco is working on and has in test at this time. No timeframe for release though. -John -Original Message- From: Jason Bertoch [mailto:ja...@i6ix.com] Sent: Wednesday, October 07, 2009 1:03 PM To: nanog@nanog.org Subject: Re: Help - Unable to builld a IP-SEC VPN on a Cisco ASA 5520 Michael Ruiz wrote: Group, I am stuck like chuck. We are unable to activate a VPN in one of the virtual firewall context. Under the crypto commands, none of the IP-sec are available. Any help on this would be appreciated. Version we running is 8.0(4) Isn't VPN only available in single-context mode?
Re: Does Internet Speed Vary by Season?
joel jaeggli expunged (joe...@bogus.com): ADSL systems will retrain to a lower rate as line conditions (SNR) change for the worse. The attentuation characteristics of a given pair will change of time due to a number of factor, including but not certainly limited to physical wear, moisture invasion, localized source of interference, sunspot activity etc. Are dsl plants subject to localized environmental conditions? Absolutely. I could be convinced that extremem heat could change a cables velocity factor, but that should only result in slight changes in phase, which I guess would result in a higher BER. Oh, and you forogot about cosmic rays :) -Steve
Re: Dutch ISPs to collaborate and take responsibility
From nanog-bounces+bonomi=mail.r-bonomi@nanog.org Wed Oct 7 06:18:24 2009 Date: Wed, 07 Oct 2009 18:17:57 +0700 From: Dave Temkin dav...@gmail.com To: Alexander Harrowell a.harrow...@gmail.com Subject: Re: Dutch ISPs to collaborate and take responsibility Cc: nanog@nanog.org Alexander Harrowell wrote: On Wednesday 07 October 2009 00:27:55 Joe Greco wrote: Assuming that the existence of an infected PC in the mix translates to some sort of inability to make a 911 call correctly is, however, simply irresponsible, and at some point, is probably asking for trouble. ... JG Also, someone mentioned that the FCC doesn't in fact mandate that PSTN terminals should be able to make emergency calls even if formally disconnected and asked about cellular. The opposite is true about GSM and its descendants; whether or not you're a valid roamer for the network you're talking to, have a prepaid balance, have paid your bill, you must be able to make emergency calls. Similarly, even if no SIM card is present, the device should register with the network as limited service - i.e. emergency only. The FCC generally doesn't come into play when you're talking about ILEC telephone service except at a very high level. In California, by PUC regulation telephone companies are required to allow access to 911 so long as there is copper in the facility and it was, at any time, active with any sort of phone service. Not exactly. They are required to do it only 'to the extent permitted by existing facilities'. To wit, if they need that wire pair to provide service (say, an additional line) to a paying customer, they _can_ physically disconnct the 'inactive account' premises, and hook up the new paying account to that pair. On occasion, telcos are known to re-use the pair, by just hooking the new customer onto it, _without_ pulling the bridge clips at the 'multiple' where the old custmer was connected. This leads to all sorts of messes. the 'non- customer' discovers dial-tone on the pair and starts using it. Calls are being made which the _real_ customer didn't make, which leads to real arguments with the billing department. Then, the customer picks up their phone, and instead of getting dial tone, discovers a conversation _in_progress_ on the line -- when _nobody_else_ at their place is on the phone. Strangely, the parties to that conversation refuse to identify themselves, and one of them is _really_ anxious to terminate that call, so you can use your line. I, personally, have been through this more than once, in older, high-density housing neighborhoods.
Re: Does Internet Speed Vary by Season?
I may be having my wires a little crossed (I'm not an electrical engineer) but I was always under the impression that manipulation of the physical characteristics like that from heat/dampness didn't reduce the speed but the quality (like line noise/errors/etc) of the line. Whether old telco lines or newer data lines it's all about electrical signal and bit error rates. More errors = more retransmissions = slower perceived throughput. Just my thinking. Scott Joe Greco wrote: http://www.wired.com/gadgets/miscellaneous/magazine/17-10/ts_burningquestion It used to be that we would notice this, except that it had everything to do with temperature *and* dampness. In the '90's, it was still quite common for a lot of older outside plant to be really only voice grade and it wasn't unusual for copper to run all the way back to the CO, through a variety of taps and splice points. Even though Ma Bell would typically do a careful job handling their copper, the sheer number of potential points of failure meant that it wasn't unusual for water to infiltrate and penetrate. If I recall correctly, the worst was usually a long, hard cold rain (hey we're in Wisconsin) after which people who had been getting solidly high speed modem connects would see a somewhat slower speed. ... JG
RE: Help - Unable to builld a IP-SEC VPN on a Cisco ASA 5520
Thank you for your help for this question. Have a good day. -Original Message- From: Tillinger, Steve [mailto:steve.tillin...@sourcemedia.com] Sent: Wednesday, October 07, 2009 12:00 PM To: Michael Ruiz; nanog@nanog.org Subject: RE: Help - Unable to builld a IP-SEC VPN on a Cisco ASA 5520 IPsec isn't available when in multiple context mode. -Original Message- From: Michael Ruiz [mailto:mr...@telwestservices.com] Sent: Wednesday, October 07, 2009 12:56 PM To: nanog@nanog.org Subject: Help - Unable to builld a IP-SEC VPN on a Cisco ASA 5520 Group, I am stuck like chuck. We are unable to activate a VPN in one of the virtual firewall context. Under the crypto commands, none of the IP-sec are available. Any help on this would be appreciated. Version we running is 8.0(4) Michael Ruiz mr...@telwestservices.com mailto::mr...@telwestservices.com This communication is intended solely for the addressee and is confidential and not for third party unauthorized distribution
Re: Does Internet Speed Vary by Season?
On Wed, 7 Oct 2009 23:12:44 +0800 Adrian Chadd adr...@creative.net.au wrote: Please don't forget moisture content. DSL speeds may drop during wet winters because cable pits fill with water. :) Those with real statistics, please stand up. I know ISPs who run large DSL infrastructures have these stats. I've even seen them at conferences. :) Adrian Me! During the rainy season of recent past years, the cable vault in front of my home would flood, thereby degrading or completely hosing DSL service. Haven't had heavy rains for a couple years so no trouble. I had to replace my DSL modem about 6 months ago because the previous Westell Wirespeed modem had died very slowly. My speed went from 1.5M to less than 200k and was flaky. The new modem gives me a clean 3M/768k connection. Not bad for DSL ($35/month). But that wasn't weather related. Verizon. matthew black california state university, long beach
Re: Does Internet Speed Vary by Season?
Quoting Joe Greco (jgr...@ns.sol.net): http://www.wired.com/gadgets/miscellaneous/magazine/17-10/ts_burningquestion If I recall correctly, the worst was usually a long, hard cold rain (hey we're in Wisconsin) after which people who had been getting solidly high speed modem connects would see a somewhat slower speed. Matches my story exactly. I once had an ADSL connection which, on dry periods, synced at the maximum of 8Mbps and when it had rained for a day this would drop to about 6Mbps. It always worked though, the SNR just went up. I regularly rebooted the modem to make it retrain. An engineer from the telephone company came to check the wiring but couldn't find anything that would constitute replacing the line or something less drastic... Regards, -Sndr. (NL) -- | /dev/hda1 has been checked 20 times without being mounted, mount forced | 4096R/6D40 - 1A20 B9AA 87D4 84C7 FBD6 F3A9 9442 20CC 6CD2
Telus BGP/ACL contact
I'm looking for a Telus individual who might be able to adjust a prefix list for me. Our sales rep no longer works for Telus and it's after 5pm here, so no account managers are available to help me expedite this request. The NOC insists that there's nothing they can do unless I have something from my account person and unfortunately this is relatively time sensitive. Thanks in advance.
Re: Does Internet Speed Vary by Season?
Ignoring the little distractions, and taking a 30,000 ft view on this topic, my thoughts were always that backbone capacity gets behind, and backbone takes time to provision. Then it catches up, or leap frogs demand just in time for a wane in traffic. Try as we may, you can only predict traffic to a certain extent, and sometimes backbone upgrades planned and it works out, and sometimes those upgrades are reactionary. Usually a mix, as I will now demonstrate with the following example: (Late Spring) oh, it looks like I'll need more capacity in a few months...better start the upgrade... (Summer) We're still doing well because bandwidth growth has waned, but that upgrade will be welcome..good thing it's in progress (Fall) We're peaking at 80-90%... really hurting and still waiting on the upgrade! delays from (telco, fiber company, government giving rights of way, fiber provider not having enough capacity, etc) (Late fall) This new upgraded set of tubes is great! (Winter) oh, it looks like I'll need more capacity in a few months...better start the upgrade process (Spring) We're feeling the crunch and out of bandwidth...can't get bandwidth fast enough (Summer) This new upgrade came just in time for the bandwidth constraints to ease... We've all been through this cycle. Multiply it by the whole internet going through this cycle all the time and of course things will feel faster/slower at certain times of the year. If we al had OC-Ubber-bit pipes on demand, there wouldn't be slow times. But the fact of the matter is that upgrades take time. Usually longer than quoted. Add seasonal variations in use to a 30-90-180 day lag time (depending on the size of the tube that's being upgraded) and you get people noticing the perceived speed changes. -Jerry
Data Centers in England
Anyone know a good DC on England that caters to financial industry clients?
RE: Data Centers in England
http://www.datacentermap.com/united-kingdom/london/ As a good resource as well - Best regards, Scott Spencer Data Center Asset Recovery/Remarketing Manager Duane Whitlow Co. Inc. Nationwide Toll Free: 800.977.7473. Direct: 972.865.1395 Fax: 972.931.3340 sc...@dwc-computer.com www.dwc-it.com Sales of new and used Cisco/Juniper/F5/Foundry/Brocade/Sun/IBM/Dell/Liebert and more ~ -Original Message- From: Philip Lavine [mailto:source_ro...@yahoo.com] Sent: Wednesday, October 07, 2009 3:34 PM To: nanog Subject: Data Centers in England Anyone know a good DC on England that caters to financial industry clients?
Re: Does Internet Speed Vary by Season?
I may be having my wires a little crossed (I'm not an electrical engineer) but I was always under the impression that manipulation of the physical characteristics like that from heat/dampness didn't reduce the speed but the quality (like line noise/errors/etc) of the line. Whether old telco lines or newer data lines it's all about electrical signal and bit error rates. More errors = more retransmissions = slower perceived throughput. Just my thinking. Reduced quality results in reduced speed. In the best case, you have a technology like DSL that detects the reduced quality, and dynamically adjusts transmission characteristics to adapt. In other cases, you have a technology like Ethernet where misdetection of bits results in the loss of a packet, and ultimately requires retransmission. ... 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.
Re: Data Centers in England
On Wed Oct 07, 2009 at 02:33:33PM -0700, Philip Lavine wrote: Anyone know a good DC on England that caters to financial industry clients? Telehouse London started as a Banking DR centre, so would probably meet your needs. Otherwise, there's Interxion, which claims to have all sorts of security certifications. The other usual suspects are also available in London - Level3, Equinix, CW, etc... Simon
Re: Data Centers in England
As the CTO of a financial company with multiple data centers in London, I would recommend Equinix Slough (or London 4) site. They have a website setup just for Financial firms. http://financial.equinix.com/ I've got space in both Telehouse and Equinix and would recommend Equinix for someone looking for full service collocation and Telehouse to someone who is looking for network interconnection. Shane On Oct 7, 2009, at 5:59 PM, Simon Lockhart wrote: On Wed Oct 07, 2009 at 02:33:33PM -0700, Philip Lavine wrote: Anyone know a good DC on England that caters to financial industry clients? Telehouse London started as a Banking DR centre, so would probably meet your needs. Otherwise, there's Interxion, which claims to have all sorts of security certifications. The other usual suspects are also available in London - Level3, Equinix, CW, etc... Simon
Turkish Networks related questions..
I have got few questions regarding Turkish ISPs, networks, could someone from Turkey possibly contact me offlist please? thank you. -- Mehmet Akcin Blog: http://www.mehmetakcin.com E-mail: meh...@akcin.net
