April 2010 - Test - lists.nanog.org

Re: what about 48 bits?
by Tim Franklin 07 Apr '10

07 Apr '10

> This reminds of me of the failure-mode-within-a-failure-mode of 10b2 > with vaxstation2000's using vms's vaxcluster software. Unplugging the > 10b2 gave you a window of about 10 seconds before one by one every > vaxstation2000 would bugcheck. I was always rather astonished that > nobody at DEC either noticed it, or thought it was a very big deal > because the bug survived a long time. I thought that was just me. My first IT job was developing credit-card systems on VAXen. We had the office flood-wired with 10base2 in one long bus - at locations where there wasn't a PC yet, there was just a faceplace with two BNC connectors, and a tiny patch lead between them. To install a new PC, you had to have a length of co-ax long enough to go from the faceplate to the desk and back, with a T-piece in the middle. Installation involved whipping out the short patch lead and re-connecting both ends of the longer one before things elsewhere declared the network as broken and started shutting down somewhat ungracefully. This was best done as a two-man job, but we did get it down to quite an art. Nice to know after all this time that someone else was playing the same silly game... Regards, Tim.

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Best Practice: 2routers, 2isp, 1AS
by Beavis 07 Apr '10

07 Apr '10

Greetings! Want to ask out anybody on the list about a "best practice" of the setup below: - 2 ISP's (A & B) - 2 Routers (A & B) I want Router-A for ISP-A, Router-B for ISP-B and have Router-A & Router-B talk and be able to pass routes on each side in an event of a physical failure on one of the Routers. I was planning at first to setup a multi-home BGP, but I want to have physical redundancy as well. ASCII-diag =--[RouterA]--isp1(bgp) L | A iBGP N | =--[RouterB]--isp2(bgp) Any recommendation would awesomely appreciated. -B -- () ascii ribbon campaign - against html e-mail /\ www.asciiribbon.org - against proprietary attachments

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IPv6 Newbie
by shake righa 07 Apr '10

07 Apr '10

I have several queries in regards to ipv6 different documentation state that clients be given /64 with ISP's beign given /48 from assigned global /32. Can one subnet to include /127 for point to point connections? Is there any newbie guide for ipv6 subnetting? Regards, Shake

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Re: what about 48 bits?
by Robert Bonomi 06 Apr '10

06 Apr '10

> From: Steven Bellovin <smb(a)cs.columbia.edu> > Date: Mon, 5 Apr 2010 13:51:23 -0400 > Cc: NANOG <nanog(a)nanog.org> > > On Apr 5, 2010, at 1:43 52PM, Valdis.Kletnieks(a)vt.edu wrote: > > > On Mon, 05 Apr 2010 13:29:20 EDT, Jay Nakamura said: > >>>> I would have attributed the success of Ethernet to price! > >>>>=20 > >>>>=20 > >>> You've got the causality wrong -- it wasn't cheap, way back when. > >>=20 > >> I remember back in '93~94ish (I think) you could get a off brand 10BT > >> card for less than $100, as oppose to Token Ring which was $300~400. > >> I can't remember anything else that was cheaper back then. If you go > >> back before that, I don't know. > >=20 > > Steve is talking mid-80s pricing, not mid-90s. By '93 or so, the fact > > that Ethernet was becoming ubiquitous had already forced the price = > down. > > Yup. 10 years earlier, a 3Com Ethernet card for a Vax cost about $1500, = > if memory serves. That ball-park anyway -- ethernet for VMEbus or VERSAbus was in the same price range. Just a _few_ years later, ARCnet was one of several signficantly less expensive alternatives for limited-size (both in number of hosts, and distance) LANS.

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ping "eu.level3.net"
by Henry Yen 06 Apr '10

06 Apr '10

Anyone from "eu.level3.net" who can respond to an e-mail (inbound) misconfiguration? -- Henry Yen Aegis Information Systems, Inc. Senior Systems Programmer Hicksville, New York

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Re: Books for the NOC guys...
by Marty Anstey 06 Apr '10

06 Apr '10

Max Gribov wrote: > On 04/06/2010 01:17 PM, Marty Anstey wrote: >> Nick Hilliard wrote: >> >>> "PHP stinks on the command line and text processing" >>> >>> >> This is a bit of a broad sweeping statement! Can you elaborate on what >> your definition of how PHP "stinks" in this context? >> > > well, try to parse ~60mb csv file doing some simple tweaks to the > input and then insert it into the database, and watch how much ram > your script will use, as well as how long it will take vs perl.. > for me, it takes about 5 hours and eats up to 1gb of ram (configured > memory limit for php for me) > > Hi Max, While I appreciate where you're coming from, I've never had that issue. It sounds like you're trying to load the entire script into RAM and then parse it. Regardless of the language you are using, you'll still essentially get the same result. > that said, php is awesome otherwise, been using it for last 2 years > strictly in 'enterprise' deployment.. > id just say perl is faster and more efficient for batch scripts. I can't speak specifically to the performance differences for comparible operations in PHP and PERL as I have never done a side-by-side comparison myself. But FWIW, I have parsed multi-gigabyte files with PHP on the command line and it's never been markedly "slow". Sure, it's not pure C but it's never been so slow that i've thought - "heck, this would be a lot faster with PERL"... Just my $0.02... Cheers, -Marty

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Re: Auto MDI/MDI-X + conference rooms + bored == loop / 802.1aq Shortest Path Bridging
by Peter Ashwood-Smith 06 Apr '10

06 Apr '10

These standards do drag on don't they. I'd suggest that customers need to come along and crack the whip a bit to help keep us grounded and moving.good excuse to travel somewhere warm ;) On the 802.1aq comment, we are doing MIBs/cleanup now so it should be out by end of this year so its probably time for an 802.1aq tutorial at NANOG. Peter Ashwood-Smith. _____ From: James Hess <mysidia () gmail com> Date: Fri, 26 Mar 2010 23:13:11 -0500 _____ On Fri, Mar 26, 2010 at 9:29 PM, Chuck Anderson <cra () wpi edu> wrote: So basically, the problem is the core switches implement a proprietary loop-prevention protocol that sends "beacon" frames out every 500ms, and if a certain number of these special frames come back (exceeds --> loop first, but I'm beginning to think that this protocol is crap and I should just disable it and let the core ride out the loop in the Ah, nasty.. it seems like you definitely should want to keep the beacon frames from getting injected then. Taking down core links ought to be harder than 1 user emitting a few frames. A malicious user, or a naive user with a malicious trojan on their computer could try to send fake beacons, to cause trouble. I for one might start thinking if the beacons can be sunk from end user ports by brute force, using a Layer 2 ACL. I wonder if RFC 5556, IETF TRILL specs, or 802.1aq/802.1Qbb / Datacenter Ethernet / Bridging standards and more robust standards-based loop avoidance standards will ever get finalized, considering they have been drafts for over 5 years, it seems like the standardization is very sluggish. A new protocol is probably the right solution, but it might not be ready until 2015 at this rate. Anyone know if Auto MDI/MDI-X is inherent or required in 1000Base-T? It would be nice if I could shut it off. Auto MDI/MDI-X is an optional feature in the 1000BaseT standard. Automatic negotiation of speeds and duplex, is mandatory due to 802.3ab, but not auto-crossover You can get that here http://standards.ieee.org/getieee802/802.3.html Clause 40.4.4 in IEEE 802.3-2008 -- Section Three states the following: "40.4.4 Automatic MDI/MDI-X Configuration Automatic MDI/MDI-X Configuration is intended to eliminate the need for crossover cables between simi lar devices. Implementation of an automatic MDI/MDI-X configuration is optional for 1000BASE-T devices. If an automatic configuration method is used, it shall comply with the following specifications. The assignment of pin-outs for a 1000BASE-T crossover function cable is shown in Table40-12 in 40.8. "

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Re: As the "NANOG Community" Moves to IPv6...
by Tim Franklin 06 Apr '10

06 Apr '10

> P.S. Does anyone else think that perhaps "ipv3.com" == "Guillaume > FORTAINE"? It's spewing semi-coherent proposals for unworkable alternative addressing schemes. Sounds more like Jim Fleming to me. Perhaps we start comparing IPv3 to IPv8 and see if we get a reaction? ;) Regards, Tim.

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Comcast wins Web traffic court fight against FCC
by Marshall Eubanks 06 Apr '10

06 Apr '10

This seems relevant. Decided April 6, 2010 Because the Commission has failed to tie its assertion of ancillary authority over Comcast's Internet service to any "statutorily mandated responsibility," Am. Library, 406 F.3d at 692, we grant the petition for review and vacate the Order. So ordered. Court decision here : http://pacer.cadc.uscourts.gov/common/opinions/201004/08-1291-1238302.pdf Analysis http://www.reuters.com/article/idUSN0622428720100406 Regards Marshall

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cisco snmptrapd
by Bogdan 06 Apr '10

06 Apr '10

hello does anyone have a working configuration regarding cisco sending snmp traps on tcn ? i mean the actual info that i am seeing in the sh span vlan xx detail which is like this: Number of topology changes 15 last change occurred 00:22:27 ago from GigabitEthernet0/32 i have configured the mibs from cisco, i can receive other useful info (interface up/down is working ok) but on snmp-server enable traps bridge, when i generate a tcn i receive: Subject: trap received from <UNKNOWN>: SNMPv2-SMI::mib-2.17.0.2 Host: <UNKNOWN> (UDP: [10.255.10.222]:64858) DISMAN-EVENT-MIB::sysUpTimeInstance 0:3:55:38.13 SNMPv2-MIB::snmpTrapOID.0 SNMPv2-SMI::mib-2.17.0.2 SNMPv2-SMI::enterprises.9.9.82.1.11.4.1.1.1 1 IF-MIB::ifName.10132 Gi0/32 Host: <UNKNOWN> (UDP: [10.255.10.222]:64858) DISMAN-EVENT-MIB::sysUpTimeInstance 0:3:55:38.14 SNMPv2-MIB::snmpTrapOID.0 SNMPv2-SMI::mib-2.17.0.2 SNMPv2-SMI::enterprises.9.9.82.1.11.4.1.1.0 0 IF-MIB::ifName.10132 Gi0/32 the test switch is 3560G and the i use snmptrapd from a fedora thanks Bogdan

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