Re: "Hypothetical" Datacenter Overheating

Free air cooling loops maybe? (Not direct free air cooling with air exchange, the version with something much like an air handler outside with a coil and an fan running cold outside air over the coil with the water/glycol that would normally be the loop off of the chiller) the primary use of

Re: Any clue as to when bgp.he.net will be back?

:: On 1/16/24 11:20 PM, Ben Cox wrote: :: Fixed, cheers for pointing that logical error out :) Thanks! scott On 1/16/24 11:20 PM, Ben Cox wrote: Fixed, cheers for pointing that logical error out :) $ git show commit 689bca929c5d3a27e6aa4f12195bf3b81b3be719 (HEAD -> master) Author:

Re: Any clue as to when bgp.he.net will be back?

+1 for bgp.tools, it is a superior tool. Sadly, the corporate IT-forced DNS filtering at work for “cybersecurity” (Mimecast) thinks it is a compromised website for some reason, so bgp.he.net ends up being used while I am at the office. On Jan 16, 2024, at 8:44 AM, Ian

Re: "Hypothetical" Datacenter Overheating

For completeness' sake at the first commercial ISP to sell individual dial-up to the public, The World, we had six of those typical desktop 2400bps modems (I forget the brand tho I still have them, a photo also I think) sitting on a file cabinet in an office space in Brookline, MA plugged into a

Re: "Hypothetical" Datacenter Overheating

Others have pointed to references, I found some others, it's all pretty boring but perhaps one should embrace the general point that some equipment may not like abrupt temperature changes. But phones (well, modern mobile phones) don't generally have moving parts. So the issue is more likely

Re: Any clue as to when bgp.he.net will be back?

Fixed, cheers for pointing that logical error out :) $ git show commit 689bca929c5d3a27e6aa4f12195bf3b81b3be719 (HEAD -> master) Author: Ben Cartwright-Cox Date: Tue Jan 16 23:17:08 2024 + clarify pricing for a nanog person

Re: Any clue as to when bgp.he.net will be back?

It only applies if you are purchasing their monitoring services. Not just to use the site for info. On Tue, Jan 16, 2024 at 5:04 PM scott via NANOG wrote: > > > On 1/16/24 2:44 PM, Ian Chilton wrote: > > > Not a direct answer to your question, but if you're not aware of it, > >

Re: Any clue as to when bgp.he.net will be back?

scott via NANOG writes: > What if someone originates a /15? That's one of the prefix sizes we > originate. They need a 'less than or equal to' thingie in there. I've asked the maintainer of this service (whom I recently met and who might not be on NANOG) to clarify this.

Re: IPv6 Traffic Re: IPv6? Re: Where to Use 240/4 Re: 202401100645.AYC Re: IPv4 address block

> On Jan 14, 2024, at 19:50, Abraham Y. Chen wrote: > > Hi, Ryan: > > 1) " ... it accounts for 40% of the traffic at Google. ": > > Perhaps you were referring to the following? > > https://www.google.com/intl/en/ipv6/statistics.html > > 2)If so, your quotation is

Re: "Hypothetical" Datacenter Overheating

On Tue, 2024-01-16 at 10:44 -0800, Jay Hennigan wrote: > We made our own. And then we had to deal with all the wall warts. We > rigged up a power supply with a big snake of barrel jacks. Luxury. We had a hamster in a hamster wheel for each modem. Ah, the old days. Regards, K. --

Re: Any clue as to when bgp.he.net will be back?

On 1/16/24 2:44 PM, Ian Chilton wrote: Not a direct answer to your question, but if you're not aware of it, https://bgp.tools/  is a great tool and shows the same info. -- They need to fix their page regarding cost. Originates less

Re: Operational contact asrank.caida.org

The AS rank is calculated by a program. I think they would be unwilling to modify it manually. I think you have to wait for the monthly re-generate. Tom > On Jan 16, 2024, at 1:34 PM, wrote: > > Hello Community, > > I am looking for an operational contact for asrank.caida.org >

Operational contact asrank.caida.org

Hello Community, I am looking for an operational contact for asrank.caida.org, I urgently need them to modify an inconsistency identified in the published ranking, I have sent messages to the feedback emails indicated on the website and I didn't receive a response. Thank you very much for

Re: "Hypothetical" Datacenter Overheating

350 Cermak Chicago is a "historic" building which means you can't change the visible outside. Someone had long discussions about the benefits of outside air economizers, but can't change the windows. Need to hide HVAC plant (as much as possible). I would design all colos to look like 375

Re: Stealthy Overlay Network Re: 202401100645.AYC Re: IPv4 address block

> > If "EzIP" is about using 240/4 as CGNAT space, let's call it what it is, > not rename something that already exists and attempt to claim it as a new > idea. > Yes he is essentially re-creating NAT/CGNAT, but in a worse way. If you ignore all the multitude of technical issues, if you grabbed

Re: Any clue as to when bgp.he.net will be back?

My Windows Chrome nor Android Chrome have any ad/script blockers. Both showed me the error page. Looks like it's showing me the tool now, though. On Tue, Jan 16, 2024 at 12:10 PM Alec Edworthy wrote: > As someone said on a different thread, and it worked for me, check your > ad/script

Re: "Hypothetical" Datacenter Overheating

On 1/16/24 10:33, Shawn L via NANOG wrote: I remember those days --- I think we bought cages from someone and pulled the boards out of the modems to mount them. We made our own. And then we had to deal with all the wall warts. We rigged up a power supply with a big snake of barrel jacks.

Re: "Hypothetical" Datacenter Overheating

On Tue, Jan 16, 2024 at 10:30 AM Chris Adams wrote: > The back-room ISP I started at was at least owned by a company with > their own small machine shop, so we had them make plates we could mount > two Sportsters (sans top) to and slide them into card cages. 20 modems > in a 5U cage! The ISP

Re: IPv6 Traffic Re: IPv6? Re: Where to Use 240/4 Re: 202401100645.AYC Re: IPv4 address block

On 1/15/24 11:02 PM, Saku Ytti wrote: On Mon, 15 Jan 2024 at 21:08, Michael Thomas wrote: An ipv4 free network would be nice, but is hardly needed. There will always be a long tail of ipv4 and so what? You deal with it at your I mean Internet free DFZ, so that everyone is not forced to

Re: "Hypothetical" Datacenter Overheating

On Tue, Jan 16, 2024 at 08:37:09AM -0800, Warren Kumari wrote: > ISP/Colo provider The good ole days. When one stacked modems with two pencils in between them and box fans blew through the gaps. -- . ___ ___ . . ___ . \/ |\ |\ \ . _\_ /__ |-\ |-\ \__

Re: Any clue as to when bgp.he.net will be back?

As someone said on a different thread, and it worked for me, check your ad/script blockers. I disabled mine for the site and the site came back to life for me. A -- Alec Edworthy a.edwor...@lboro.ac.uk

RE: "Hypothetical" Datacenter Overheating

For gear climate controls and rate of change look at ASHRAE ratings on the equipment. Most vendors publish the rating of equipment on their data sheets (sometimes they include the ASHRAE rating), and it gives the required operating conditions as well as acceptable rates of change. Most well

Singtel NOC Contact

Subject: Singtel NOC Contact Good day from Singapore, Anyone knows the email address for Singtel NOC? Regards, Mr. Turritopsis Dohrnii Teo En Ming

Re: Backward Compatibility Re: 202401100645.AYC Re: IPv4 address block

Yes, some folks made Bell very umm... blue at times. Indeed I remember a Touch Tone fee on our bills until the 90's.  In fact, at one point I couldn't believe it was still a charge, as rotary phones had largely been replaced either as a choice or through attrition. Consumers WANTED Touch Tone. 

Re: "Hypothetical" Datacenter Overheating

On Mon, Jan 15, 2024 at 9:55 AM, William Herrin wrote: > On Mon, Jan 15, 2024 at 6:08 AM Mike Hammett wrote: > > Let's say that hypothetically, a datacenter you're in had a cooling > failure and escalated to an average of 120 degrees before mitigations > started having an effect. What should be

Re: okta probing

One username I use is very similar to a common name in another language. I deal with an amazing amount of mistaken login/spam/account resets. I am considering just changing my username as that would be easier. I am used to spear-phishing stuff but the honest mistake emails are super annoying.

Re: "Hypothetical" Datacenter Overheating

On Mon, Jan 15, 2024 at 10:14:49AM -0500, sro...@ronan-online.com wrote: > I’m more interested in how you lose six chillers all at once. Because you're probably mistaking an air handling unit for a chiller. I usually point people at this to get us on the same page:

Re: Any clue as to when bgp.he.net will be back?

Hi, Not a direct answer to your question, but if you're not aware of it, https://bgp.tools/ is a great tool and shows the same info. Ian

Any clue as to when bgp.he.net will be back?

Thanks, Hank

Re: "Hypothetical" Datacenter Overheating

On 16/01/2024 01:32, Mike Hammett wrote: Someone I talked to while on scene today said their area got to 130 and cooked two core routers. We've lost one low-end switch. I'm very glad it wasn't two core routers! We're still looking into what recourse we have against the datacenter operator.

Re: "Hypothetical" Datacenter Overheating

On Tue, 16 Jan 2024 at 12:22, Nathan Ward wrote: > Here’s some manufacturer specs: > https://www.dell.com/support/manuals/en-nz/poweredge-r6515/per6515_ts_pub/environmental-specifications?guid=guid-debd273c-0dc8-40d8-abbc-be059a0ce59c=en-us > > 3rd section, “Maximum temperature gradient”.

Re: "Hypothetical" Datacenter Overheating

On 16/01/2024 at 10:50:13 PM, Saku Ytti wrote: > On Tue, 16 Jan 2024 at 11:00, William Herrin wrote: > > You have a computer room humidified to 40% and you inject cold air > > below the dew point. The surfaces in the room will get wet. > > > I think humidity and condensation is well understood

Re: "Hypothetical" Datacenter Overheating

On Tue, 16 Jan 2024 at 11:00, William Herrin wrote: > You have a computer room humidified to 40% and you inject cold air > below the dew point. The surfaces in the room will get wet. I think humidity and condensation is well understood and indeed documented but by NEBS and vendors as verboten.

Re: "Hypothetical" Datacenter Overheating

On 1/15/24 23:11, Martin Hannigan wrote: On Mon, Jan 15, 2024 at 4:10 PM Jay Hennigan > wrote: On 1/15/24 10:37, Pennington, Scott wrote: > yes but it has been -8 in Chicago plenty of times before this. >   Very interested in root cause...

Re: "Hypothetical" Datacenter Overheating

On Mon, Jan 15, 2024 at 11:08 PM Saku Ytti wrote: > On Tue, 16 Jan 2024 at 08:51, wrote: > > A rule of thumb is a few degrees per hour change but YMMV, depends on > > the equipment. Sometimes manufacturer's specs include this. > > Is this common sense, or do you have reference to this, like