- Test - lists.nanog.org

publishing venue
by Steve Bellovin 31 Mar '04

31 Mar '04

I've been talking to the folks at Usenix about a venue for papers of interest to this group. They've very eager to have such papers at the LISA (Large Installation System Administration) conference. Timing is tight for this year -- the deadline is in three weeks ( http://www.usenix.org/events/lisa04/ ). For those who aren't familiar with LISA, this is a conference with that publishes proceedings of refereed papers. The success, of course, depends on members of this community submitting papers, this year and next -- that's what will make the conference interesting to this community. I'm working on a journal, too. --Steve Bellovin, http://www.research.att.com/~smb

3 2

Re: DSL and/or Routing Problems
by Stewart, William C (Bill), RTSLS 31 Mar '04

31 Mar '04

> ping did _this_ Ping is not very informative or accurate. If you run a traceroute, which is also not very accurate, you can get some idea about where the delay appears to be. Is it the DSL segment? Is it somewhere else that traceroute can show you? The nice thing about delays that are this long is that 9000 ms is long enough it won't just be lost in the noise... It wouldn't be surprising if it's in your DSL, and if your DSL has changed to a lower speed (which looks like it might have happened), then maybe something _is_ wrong with your DSL, or maybe the slower speed is causing traffic backups that weren't a problem when you were getting 512 kbps, or you're getting TCP retransmissions, but maybe the problem is somewhere else in the network.

2 1

Re: UPS and generator interaction?
by David Lesher 30 Mar '04

30 Mar '04

Oh, another detail. Some 98% of the UPSi around are "standby" units. They sit and trickle their batteries until the line fails, then quickly kick in. They take 'n' hours to recharge when the line returns. But there exist another genus. These 'full time' units ALWAYS run the load from the UPS inverter; and have a big AC line->DC "battery charger" -- big enough so as to keep up. The advantage is a very high degree of line isolation. Any surge, sag, glitch, spike may affect the AC->DC side of the equation, but will have to get past the battery plant and inverter for the load to see it. Note it does not even care what the input frequency is. I know of one large unit that was sent to Mexico City. At the time, it was 50Hz, but there was some announced plan for the city to go to 60, Real Soon Now. The UPS "battery charger" ran on anything between say 40-70 Hz, but the inverter made 60.0 Hz, period. Such units are not common or cheap. In the low end, Sola Corp used to make some in the low (1-3?) KVA range. Top end, how many KVA do you need? I think the one going to Mexico City was 500KVA. If your power is really rotten [Here, Guyana comes to mind...] you may want to spend more up front. Side thought, but not a NANOG topic. What in your data center really cares if your generator puts out 57 or 63 Hz, not 60.0? Why? -- A host is a host from coast to coast.................wb8foz(a)nrk.com & no one will talk to a host that's close........[v].(301) 56-LINUX Unless the host (that isn't close).........................pob 1433 is busy, hung or dead....................................20915-1433

6 6

New cisco exploit published in the media today
by Henry Linneweh 30 Mar '04

30 Mar '04

Cisco warns of new hacking toolkit http://www.infoworld.com/article/04/03/29/HNhackingtoolkit_1.html exploit location http://www.blackangels.it/ -Henry

7 6

RE: UPS and generator interaction?
by Dave Hilton 30 Mar '04

30 Mar '04

I had trouble like this years ago. Seems that some UPSes only recognize sine-wave AC power, whereas some UPSes provice something more like sawtooth or square-wave AC power. Inserting a Variac (very inefficient) between the generator and the sensitive UPSes fixed the problem. Dave Hilton SysAdmin Entelos Dum Spiro, Spero -----Original Message----- From: Mike Lewinski [mailto:mike@rockynet.com] Sent: Monday, March 29, 2004 10:54 AM To: Brian (nanog-list) Cc: nanog(a)merit.edu Subject: Re: UPS and generator interaction? Brian (nanog-list) wrote: > Does anyone know of a way to get a UPS to trigger a generator to > start, and to switch over to the generator power automatically or does > this type of thing just not exist? What Patrick said. But, on a minor note that probably won't affect your Symmetra but I'm posting in case anyone else here can shed light on.... we had a power event this AM. The transfer switch did it's magic and all was good... Except for two new APC1400's- they failed once the batteries drained. I triple-checked that they were on the right panel, played with sensitivity, even tried daisy-chaining one off a good working 2200. Nothing I did would convince the two 1400s they had power. Once the house power was restored they came back to life and look normal. I later learned that two of our colo customers with APC1400s had the same problem :( Other models (even a couple non-essential lower-end, dumb APC 450s and 650s) didn't blink at the generator power. Mike

1 0

UPS and generator interaction?
by Brian (nanog-list) 30 Mar '04

30 Mar '04

Does anyone know of a way to get a UPS to trigger a generator to start, and to switch over to the generator power automatically or does this type of thing just not exist? Right now we've got a APC Symmetra UPS at 12kva, with no generator. The UPS keeps us running for about 45 minutes, which just isn't enough time. I called APC, but they didn't seem to have any type of automatic solution. Their method is to hook it up to a switch, and manually change the feed to the UPS from the building power to the generator power and back, but it sure would be nice to have something more automated (to save me from running like a madman when the UPS page wakes me up at 4am). I'd be very grateful to hear of any solutions that you guys have come up with in this arena. Also, any recommendations for generators? I'm not looking for something huge, just something that can be mounted on a roof. If I have to pour diesel into it every couple hours, that's fine too. Thanks in advance, Brian

12 14

RE: UPS and generator interaction?
by kwallace＠pcconnection.com 29 Mar '04

29 Mar '04

Brian (nanog-list) wrote: > Does anyone know of a way to get a UPS to trigger a generator to start, and > to switch over to the generator power automatically or does this type of > thing just not exist? What Patrick said. >But, on a minor note that probably won't affect your Symmetra but I'm >posting in case anyone else here can shed light on.... we had a power >event this AM. The transfer switch did it's magic and all was good... >Except for two new APC1400's- they failed once the batteries drained. I >triple-checked that they were on the right panel, played with >sensitivity, even tried daisy-chaining one off a good working 2200. >Nothing I did would convince the two 1400s they had power. Once the >house power was restored they came back to life and look normal. I later >learned that two of our colo customers with APC1400s had the same >problem :( Other models (even a couple non-essential lower-end, dumb APC >450s and 650s) didn't blink at the generator power. >Mike If you are sure they were on an EP panel, then you may want to verify the generator frequency/voltage. We had an old 120KVA UPS that was VERY sensitive to frequency, and would stay on battery while the generator was running, even if the frequency was only off 1/2 cycle. Regards, Keith

1 0

Re: UPS and generator interaction?
by Robert Boyle 29 Mar '04

29 Mar '04

At 01:26 PM 3/29/2004, you wrote: >I'd be very grateful to hear of any solutions that you guys have come up >with in this arena. Also, any recommendations for generators? I'm not >looking for something huge, just something that can be mounted on a roof. >If I have to pour diesel into it every couple hours, that's fine too. You need an automatic transfer switch. Asco and Kohler both make very good ones. Square-D, GE and the other electrical component companies make medium and huge units, but it sounds like you need a small one. This would normally be installed along with your generator. R Tellurian Networks - The Ultimate Internet Connection http://www.tellurian.com | 888-TELLURIAN | 973-300-9211 "Good will, like a good name, is got by many actions, and lost by one." - Francis Jeffrey

1 0

Access in Steamboat Springs CO
by Adam Maloney 29 Mar '04

29 Mar '04

Anyone providing access in Steamboat Springs care to give me dial-up access for a few days? I'd just need an hour or so a day through April 2nd. I also detected a wireless provider here called Springloose - if you guys are on-list, I wouldn't mind wireless access either :) I will be happy to return the favor if you're ever in the Twin Cities area. Adam Maloney Systems Administrator Sihope Communications

1 0

Level3 LA issues?
by Scott Francis 29 Mar '04

29 Mar '04

One of their LA switches has dropped the last 1800 consecutive packets sent through it ... as I'm a customer of a customer, details have been pretty scarce so far. Anybody else seeing issues with L3 in Los Angeles, or is it just me? I haven't been able to find a publicly-accessible network status page at level3.com so far ... thanks, -- Scott Francis | darkuncle(at)darkuncle(dot)net | 0x5537F527 Less and less is done until non-action is achieved when nothing is done, nothing is left undone. -- the Tao of Sysadmin

2 2