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sms messaging without a net?
by Dan Hollis 05 Aug '04

05 Aug '04

Does anyone know of a way to send SMS messages without an internet connection? Having a network monitoring system send sms pages via email very quickly runs into chicken-egg scenario. How do you email a page to let the admins know their net has gone down. :-P AT&T shut down their TAP dialup late last year. The only method that comes to mind is to buy a GSM modem which has SMS messaging capability. Has anyone done this? -Dan

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Re: Reporting the state of an apparatus to a remote computer patented
by Eric Brunner-Williams in Portland Maine 05 Aug '04

05 Aug '04

so ... mark lottor's your-machine-room-is-melting thermo+modem circa 1990 is what? prior art?

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RE: BGP Redistribution question
by Michael Dell 05 Aug '04

05 Aug '04

Hi there The redistribution information you have set in BGP only redistributes routes *learnt* via OSPF into BGP. An alternative solution to using the network command in BGP would have been to use the "redistribute static" command from within the BGP process context. This would be similar to the redistribute static command you had set up within the OSPF context. The network command tells BGP to originate a route for that network whether or not such a route exists in the router's IP route table, which means it has no connection with the static IP route you defined. Hope that helps. Mike Dell Networking Protocols Group Data Connection Ltd Tel: +44 20 8366 1177 Fax: +44 20 8367 8501 E-mail: mike.dell(a)dataconnection.com Web: http://www.dataconnection.com -----Original Message----- From: owner-nanog(a)merit.edu [mailto:owner-nanog@merit.edu]On Behalf Of D Train Sent: 05 August 2004 16:09 To: nanog(a)nanog.org Subject: BGP Redistribution question While looking into a routing issue, I found that one of my routers wasn't passing one of my static routes, being redist into ospf into bgp, and not sure as to why. It has been a while since I have worked with BGP, so I am a little rusty. The solution was for me to add the following BGP network statement... network 10.86.8.0 mask 255.255.248.0. If statics are being redist info ospf, and ospf is basically being redist into bgp, why did I have to have the network statement. Why didn't it put it into BGP and pass it along? Here is the scenario: Router A: ip route 10.86.8.0 255.255.248.0 10.86.138.14 ATL--CR6513A#ping 10.86.138.14 success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/4 ms ATL -CR6513A#sh ip route 10.86.8.0 Routing entry for 10.86.8.0/21 Known via "static", distance 1, metric 0 Redistributing via ospf 1 Advertised by ospf 1 subnets bgp 2 Routing Descriptor Blocks: * 10.86.138.14 Route metric is 0, traffic share count is 1 ATL-CR6513A#sh ip ospf data ext 10.86.8.0 OSPF Router with ID (10.86.194.5) (Process ID 1) Type-5 AS External Link States Routing Bit Set on this LSA LS age: 898 Options: (No TOS-capability, DC) LS Type: AS External Link Link State ID: 10.86.8.0 (External Network Number ) Advertising Router: 10.86.194.2 LS Seq Number: 80000D87 Checksum: 0x3D49 Length: 36 Network Mask: /21 Metric Type: 2 (Larger than any link state path) TOS: 0 Metric: 20 Forward Address: 0.0.0.0 External Route Tag: 0 LS age: 554 Options: (No TOS-capability, DC) LS Type: AS External Link Link State ID: 10.86.8.0 (External Network Number ) Advertising Router: 10.86.194.5 LS Seq Number: 80000D87 Checksum: 0x2B58 Length: 36 Network Mask: /21 Metric Type: 2 (Larger than any link state path) TOS: 0 Metric: 20 Forward Address: 0.0.0.0 External Route Tag: 0 ATL-CR6513A#sh ip bgp 10.86.8.0 BGP routing table entry for 10.86.0.0/16, version 1078065 Paths: (2 available, best #2, table Default-IP-Routing-Table) Multipath: eBGP Advertised to non peer-group peers: 10.1.2.9 1, (aggregated by 1 10.1.254.253) 10.1.2.9 from 10.1.2.9 (10.1.254.253) Origin IGP, metric 0, localpref 100, valid, external, atomic-aggregate, multipath 1, (aggregated by 1 10.1.254.252) 10.1.2.1 from 10.1.2.1 (10.1.254.252) Origin IGP, metric 0, localpref 100, valid, external, atomic-aggregate, multipath, best router ospf 1 redistribute static subnets router bgp 2 no synchronization network x.x.x.x network y.y.y.y network 10.86.8.0 mask 255.255.248.0 ***had to be added for this to work, but wasn't present before hand*** redistribute connected route-map OSPF-Links redistribute ospf 1 route-map WW-OSPF-Routes neighbor 10.1.2.1 remote-as 1 neighbor 10.1.2.1 advertisement-interval 1 neighbor 10.1.2.9 remote-as 1 neighbor 10.1.2.9 advertisement-interval 1 maximum-paths 2 no auto-summary route-map WW-OSPF-Routes permit 10 set metric-type internal This is I was seeing on my Upstream Core router: ATL -CR12406A#sh ip route 10.86.8.0 Routing entry for 10.86.0.0/16 Known via "bgp 1", distance 200, metric 0, type locally generated Routing Descriptor Blocks: * directly connected, via Null0 Route metric is 0, traffic share count is 1 AS Hops 0, BGP network version This is what I was seeing after I add the network statement: GAATL-WW1-CR12406A#sh ip bgp 10.86.8.0 BGP routing table entry for 10.86.8.0/21, version 2210556 Paths: (2 available, best #2, Advertisements suppressed by an aggregate.) Multipath: eBGP iBGP Not advertised to any peer 2 10.1.2.2 from 10.1.2.2 (10.86.194.5) Origin IGP, metric 0, localpref 100, valid, external, multipath 2 10.1.2.6 from 10.1.2.6 (10.86.194.2) Origin IGP, metric 0, localpref 100, valid, external, multipath, best __________________________________ Do you Yahoo!? Yahoo! Mail Address AutoComplete - You start. We finish. http://promotions.yahoo.com/new_mail

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searching for high bandwidth
by Jeff Wheeler 05 Aug '04

05 Aug '04

Thank you to everyone that responded to my low-latency bandwidth question, and please if anyone else has a suggestion along that line please do respond to my last email! I'll compile the responses I get and post to the list in a few days. Anyway, I'm emailing now to request any information on sources that would help in searching for high bandwidth (meaning T3 or similar) providers. I already know about bandwidth.com (a broadbandreports.com affiliate) and through Google found nationwidebandwidth.com, but what else is there? How do you all figure out who to contact when shopping around for additional bandwidth? I'm searching for a provider in the Washington, D.C. area by the way, and currently our fractional T3 is provided by UUNet. I will of course be contacting them, also I've already contact Cogent based on someone's suggestion yesterday or the day before. -- Jeff Wheeler Postmaster, Network Admin US Institute of Peace

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Convention networks and viruses
by Sean Donelan 05 Aug '04

05 Aug '04

As NANOG has experienced during the last several meetings, in any network used by a large number of people, there will be a certain percentage of people which bring infected computers into the network. http://www.nytimes.com/2004/07/29/technology/circuits/29bost.html?pagewante… Wiring a Convention, Version 2004 By SETH SCHIESEL Published: July 29, 2004 [...] But data services have not been as solid. Many news organizations suffered intermittent breakdowns in Internet service, and on Tuesday evening the main press pavilion was offline for about 90 minutes. A spokesman for Verizon said the company deliberately caused the interruption as part of an effort to root out a more deep-seated network problem, which the company said appeared to have been caused by a virus carried by network devices provided by news organizations. In the interim, a handful of data lines provided by other companies, including AT&T, served as a backup.

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RE: Quick question.
by Michel Py 05 Aug '04

05 Aug '04

> Alexei Roudnev wrote: > We had 6509 which failed, because backplain failed (it can > not happen -:) but it happen) - iof course, no any 'dual > CPU dual power' could prevent it... Image broken line card > - it can crash whole box no matter how much 'dual' things > you have. The same with software error (I crashed one of > 6509 just running 'snmpwalk' on it). I lost a 7507 dual power dual RSP earlier this year: one of the cards died, something in the power circuitry. It put the entire router in short-circuit, both power supplies decided to go south and would not power back up again until the faulty card was physically removed. After the card was removed it worked fine again. It does not happen often, but it does happen. Redundancy is not a slam dunk with IOS though; same as dCEF, don't expect RPR-compatible images to run every config you'll bump into, YMMV. There is an annoying number of things that are not working on RPR images of fall back to route cache instead of distributed cache. > So, I always prefer to have 2 boxes and application level > reliaility instead of playing with 'dual everything' > solutions (last example - 2 days ago one of our dual-power > Intel servers failed because of 1 power supply failure - > it did not broke, but it did something wrong''' and system > crashed...). Actually, what I try to do for routers is having a "dual everything" for production and an "el-cheapo eBay special" sitting in the same rack for backup. The reason I still do dual power and dual CPU is that over the last 20 years I have seen very little failures of redundant systems (although I have seen some) however a dual-something saved my bottom several times. That part of my body is priceless :-D For PCs I install dual Xeons on every production machine for example, even though the CPU power needed for some is a 486; Intel processors do die like anything else; a processor dying will typically lead to a system crash, but it does reboot in single-processor mode when the graveyard dude pushes the reset button. I also try do have RAID-10 arrays span over two raid cards; same as CPUs, a RAID card that dies will likely crash the system but it will reboot in degraded mode. Michel.

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Re: low-latency bandwidth for cheap?
by Robert Bonomi 05 Aug '04

05 Aug '04

> From owner-nanog(a)merit.edu Thu Aug 5 01:51:20 2004 > Date: Thu, 5 Aug 2004 08:47:43 +0200 (CEST) > From: Mikael Abrahamsson <swmike(a)swm.pp.se> > To: Jeff Wheeler <jwheeler(a)usip.org> > Cc: nanog(a)merit.edu > Subject: Re: low-latency bandwidth for cheap? > > > On Wed, 4 Aug 2004, Jeff Wheeler wrote: > > > Anybody know a good source for near-T1 low-latency bandwidth at around > > $100/month? I'm in the northern VA area btw. > > How much is "low latency"? I have 6ms RTT over my 8M/800k ADSL, it's > usually 6-8ms over an equivalent 2M g.shdsl line. > another datapoint: 768k SDSL. 10-11 msec RTT to my ISPs peering connections with other networks. end-to-end RTT of 14 ms, over twice the physical distance (a whopping 22 miles) compared to circa 9ms times to the same location(over 12 mi end-to-end) from a real T-1 local loop. Wire distance on the DSL is about 6k ft. The T-1 loop is less than 900 ft. Everything past that 'last mile' is T-3 or better. I can live with an added 5ms.

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RE: low-latency bandwidth for cheap?
by Joe Johnson 04 Aug '04

04 Aug '04

(I think it may be a little off topic, but the internet connection is usually part of network operations . . . ) There are some carrier grade fixed-point-wireless providers around that can offer really low latency (depending on distance). I'd offer you a solution, but we're in Illinois. There might be a pretty heavy front-end expense (usually around $500-$1000) but it is usually worth it. For the service you get. Joe Johnson Fox Valley Internet -----Original Message----- From: owner-nanog(a)merit.edu [mailto:owner-nanog@merit.edu] On Behalf Of Jeff Wheeler Sent: Wednesday, August 04, 2004 4:26 PM To: nanog(a)merit.edu Subject: low-latency bandwidth for cheap? This may be the wrong forum to ask this, and if so I apologize, please just point me in the right direction! I'm getting somewhat frustrated with the instability and high latency of residential cable and DSL offerings, but I love the T1 or greater bandwidth they offer. I'd like reasonable bandwidth with low latency without spending hundreds of dollars per month! Anybody know a good source for near-T1 low-latency bandwidth at around $100/month? I'm in the northern VA area btw. -- Jeff Wheeler Postmaster, Network Admin US Institute of Peace

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RE: Quick question.
by Michel Py 04 Aug '04

04 Aug '04

>> Michel Py wrote: >> Terminators are a thing of the past; as a matter of >> fact, in California and especially in Sacramento >> they're called governators now. > Erik Bais wrote: > You mean, they'll be back? :-D Only once, and this model is obsolete and can't be upgraded to presidentor. > Paul Jakma wrote: > Intel dont do fault-tolerant SMP. Running SMP will > lower your MTBF just by fact that you now have 2 CPUs. True; this would be like raid-0 arrays, the more disks the greater the chance of failure. However, MTBF is not the name of the game here, availability ratio is. Which is tied to failure rate. In other words, I don't really care if the second processor reduces the MTBF from 200k hours to 60k hours, but I do care if the second processor reduces the time to restore service from 24 hours to 20 minutes (7.5 minutes for SNMP to fail the query twice, 1.5 minute for the tech to find out that either it's frozen or there's a BSOD, 6 minutes to have someone go there and reset, 5 minutes to reboot). The dead processor still has to be replaced, but this is scheduled maintenance, not outage. A little extra ammo when you have to hunt five or six nines. > Then there's fact that you're far more likely to > hit bugs in OS with SMP than uniproc. Unsignificant in my experience, and does not balance what Alexei mentioned yesterday: a duallie will keep the system up when a faulty process hogs 100% CPU, because the second one is still available. That also increases availability ratio. Michel.

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RE: Quick question.
by Michel Py 04 Aug '04

04 Aug '04

> Alexei Roudnev wrote: > (but we still like old and cheap 2x1Ggz servers, > able to do 99% of all tasks). Barely worth it anymore, these days you can find an Intel Server Chassis SR2300 and Intel Server Board SE7501WV2 (SCSI) for $1,500; it's a 2U dual-Xeon dual-channel DDR with 6 hot-swap scsi bays. I have to say that I get impatient when I work on anything that does not have dual-channel DDR; it does not take much time to get used to it :-( > PS. I like E-bay; last example - our collegues spend a long > negotiations and settle price for Cisco switches with a good > discount; 10 seconds e-bay search revealed exactly the same > systems in original boxes (unopened) 10% cheaper -:) Hear, hear. And since it's new, no re-licensing issues. Hardware costs nothing these days: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=73321&item=571185 5935&rd=1 Maybe that's what I'll ask Santa this year: a BFR^H^H^H GSR to replace my home router. <shameless plug> Looking for someone to provide an OC-12 to my home for $100/mo so I can test the router mentioned above. Oh, I also need this, don't I? http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=162&item=51126654 63&rd=1 </shameless plug> Michel.

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