September 2009 - Test - lists.nanog.org

23 Sep '09

Hi all, I'm encountering a problem with a wireless STM-1 link which has a switch connected at each end. The wireless link has Gigabit Ethernet interfaces and so have my switches. When I ping between the 2 switches via that wireless link I'm getting a lot of pings that are lost. The wireless link is not saturated but I'm thinking it could have to do something with the gigabit interfaces and only having 155Mbps on the link itself? All ideas welcome. Regards, Rens

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SAS70 Type II compliant colo providers - Chicago, IL
by Andy Ashley 23 Sep '09

23 Sep '09

Hi, I would really appreciate any recommendations for SAS70 Type II compliant colocation providers in Chicago, IL The requirement is fairly small (1/2 - 1 rack). Mail me off list please. Thanks. Regards, Andy. -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.

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802.17b Case studies and current usage on Metro Ethernets
by Fabio Mendes 23 Sep '09

23 Sep '09

I'd appreciate if someone could answer some of my questions: 1. What vendors currently offer support to the IEEE 802.17b standard ? 2. After extensive searching, have found no case studies. Do you guys could recomend any ? 3. If someone had been envolved with 802.17's deployments, what are your thoughts about it ? I mean, the whole process as well as the benefits (and problems) that arose. Thanks !

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Contact w/ clue re: AT&T SMS email gateway?
by Dave Pascoe 22 Sep '09

22 Sep '09

Recently something seems to have changed with the @txt.att.net email to SMS gateway. Messages sent through the gateway suffer from the following: 1) Long delay in reaching the phone (intermittent) (yes I know there is no latency guarantee) and, even more crippling, 2) Message comes through as just "SMS Message" instead of the SMTP message content. And the sender is always 410-000-01x, where x increments by 1 with each new incoming email-to-SMS gateway-handled message. Phone is an iPhone 3GS. This has worked fine for quite a while. No changes on the iPhone. I have gone through normal AT&T Wireless Customer Service but there isn't much clue there - had to explain what an email to SMS gateway is. Anyone elese seeing this? Anyone from AT&T Wireless here? Please contact me off-list. TIA, Dave Pascoe

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RETRACTION : SMS
by Aaron D. Osgood 22 Sep '09

22 Sep '09

My apologies for the wasted bandwidth - my last message was not intended for the list (NOTE TO SELF: Double check the TO line when I hit REPLY!) Aaron D. Osgood Streamline Solutions L.L.C P.O. Box 6115 Falmouth, ME 04105 TEL: 207-781-5561 FAX: 615-704-8067 MOBILE: 207-831-5829 <mailto:AOsgood@Streamline-Solutions.net> AOsgood(a)Streamline-Solutions.net http://www.streamline-solutions.net Introducing Efficiency to Business since 1986.

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UDP and IP fragmentation
by Philip Lavine 22 Sep '09

22 Sep '09

To all, I am running a Windows based high performance computing application that uses "reliable" multicast (29West) on a gigabit LAN. All systems are logically on the same VLAN and even on the same physical switch The application is set to use an 8k buffer and therefore results in IP fragmentation when datagrams are transmitted. The application is sensitive to any latency or data loss (of course) and uses a proprietary mechanism to create TCP-like retransmissions in case there is any actual data loss. Unfortunately, becasue of the fragmentation during the retransmission window all ip fragments must be resent even though only one may have been lost. If the buffer size is tweeked to the ~1460 this may fix the fragmentation but will the side effects be less throughput and possibly more latency. Is there a sweet spot for UDP on an ethernet segment? Philip

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Re: SMS
by Richard.E.Brown＠dartware.com 22 Sep '09

22 Sep '09

--- Shane Ronan wrote: On that same note, can someone point me in the direction of an SMS gateway service? I would like to be able to send SMS messages from my monitoring systems, but I am unsure about how to go about it. --- end of quote --- There are several ways to do this: - Open source software like Gammu (http://cihar.com/gammu/) can send SMS messages through a USB or RS232 attached mobile phone or cellular modem. - We've had good luck with the MultiTech MultiModem GPRS, model MTCBA-G-U-F2 (USB) and Multitech GPRS MTCBA-G-F4 and Wavecomm RS-232 GSM (RS-232) modems. - Many monitoring/management packages have built-in or add-on SMS sending utilities. - You may not want to rely on the cellular carrier's e-mail-to-SMS gateway, either because of connectivity problems or the cell carrier's delay/reliability problems. - There's also a kludge that's good for a "disaster notification" that simply rings a phone when something really bad happens. :-) Basically, the system uses its numeric pager/TAP software to dial through an analog modem and a POTS line and ring your phone/cell. The CallerID tells you who's calling, even there's no message. There's a KB article at the InterMapper site describing this is at... http://forums.dartware.com/viewtopic.php?t=913 Rich Brown richard.e.brown(a)dartware.com Dartware, LLC http://www.dartware.com 66-7 Benning Street Telephone: 603-643-9600 West Lebanon, NH 03784-3407 Fax: 603-643-2289

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Router for a file hosting service
by Vasil Kolev 22 Sep '09

22 Sep '09

Hi all, I've been banging my head for a while and finally decided to ask for a recommendation for a router for a somewhat weird situation. What we currently have is a number of 10G ethernet ports to one carrier, just switches and nothing more, the carrier is the gw for all the servers we have (everything is one big VLAN). What I need is something that can handle something like 24 10gbit ports - 10-12 to switches with the serving equipment (each one of them pushing around 8-9Gbit) and on the other side connected to a few ISPs, some of them with full tables, some of them just peering, and to push the 80-100Gbps around. (all traffic is TCP, live data says 8.4Gbps is around 1mpps) Now this seems pretty straightforward, but there's a twist. Because of the nature of the app we need to be able to do some policy routing - the devices on the back should be able to set something in the packet (like the ToS field), and the outbound route preference to be picked based on that. We'll also need to push to the routes some idea on what to prefer for specific destinations (because we have some pretty good metrics on the backend on the packet loss to each destination). There's also the small issue of scrubbing the packets of the marker I've set on the backend, not to leak it, because it seems some people tend to do weird stuff with prioritization because of it (we had one case with BT, i think). Doing these two issues at wire speed doesn't seem to be covered in the documentation, or at least in what I found. We've looked into cisco 7609 for this, but I've already read enough on this list that made me a bit wary of it (and after all the reading I'm still not sure how well would it handle the policy routing issue and the rest of the nasty things we're planning for it. Any ideas or pointers? -- Regards, Vasil Kolev

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Google Pagerank and "Class-C Addresses"
by Sebastian Wiesinger 22 Sep '09

22 Sep '09

Hello Nanog, I'm looking into a weird request which more and more customers have. They want "different Class C addresses", by which they mean IPs in different /24 subnets. The apparent reason for this is that Google will rank links from different /24 higher then links from the same /24. So it's a SEO thingy. I googled a bit and found pages after pages of FUD and such great things as the "Class C Checker": "This free Class C Checker tool allows you to check if some sites are hosted on the same Class C IP Range." My question is: Is there any proof that Google does differentiate between /24s, or even better is there any proof that this isn't the case? I will not give a customer space from different address blocks just because he read it in a SEO magazine. Perhaps someone from Google itself can answer this question? Also how do you handle such requests? I expect I'm not the only one who gets them. Regards, Sebastian -- New GPG Key: 0x93A0B9CE (F4F6 B1A3 866B 26E9 450A 9D82 58A2 D94A 93A0 B9CE) Old GPG Key-ID: 0x76B79F20 (0x1B6034F476B79F20) 'Are you Death?' ... IT'S THE SCYTHE, ISN'T IT? PEOPLE ALWAYS NOTICE THE SCYTHE. -- Terry Pratchett, The Fifth Elephant

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Cisco 7600 vs ASR 9000
by Nick Colton 22 Sep '09

22 Sep '09

I work for a small CLEC, we have been doing FTTP for 5 years now but are getting ready to update our core network and introduce IPTV services. Cisco has been recommending the Cisco 7600 as our core router. My concern is that cisco told us that in the event of an RSP failover the 7600 could take up to 30 seconds to begin routing packets again, this seems wrong to me since my old Extreme Networks BD 6808 can do failovers and rebuild route tables in under 5 seconds but?? More recently I have been reading up on the ASR 9000 however and it appears that it would be better sized for our company than the 7600. A few questions I have for the group. 1. Has anyone used the ASR 9000 in place of a Cisco 7600? 2. Is the ASR 9000 Carrier ready? Meaning 5x9's of availability, few component failures, solid software...etc 3. Has anyone had issues where it took the 7600 30 seconds to start routing again after an RSP failover? Thanks, Nick

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