#arpnetworks 2014-09-19,Fri

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WhoWhatWhen
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[FBI] starts logging #arpnetworks at Fri Sep 19 08:33:22 2014
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jdeucehow can I destroy / terminate a VM? [13:08]
brycecEmail support@ [13:10]
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m0undshttp://www.martinvigo.com/a-look-into-lastpass/ [16:28]
brycecI don't think English is the native language... And I'm very confused what this is supposed to mean "2 factor authentication should be the way to go but LastPass has this option. "
"It should be this way, BUT it is this way."
[16:39]
staticsafehttp://steamcommunity.com/id/staticsafe/screenshot/545256983451439785 [16:46]
brycec? [16:55]
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m0undsyeah, it's not the dudes' native language
haha, nice
staticsafe: the farm is real: https://www.planetside2.com/players/#!/5428059527817879329/killboard
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staticsafeman
whenever this happens, i redeploy
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m0undsi'm a terrible person, but they're bad for not killing me
i hate the mission stuff, it always glitches out for me
and i especially hate that it displaces the cap point status for the area you're actually in, in favor of showing you where it thinks you should be
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lawhey all, BGP n00b here, quick question: [18:07]
brycecEverybody, meet law
law, meet everybody
[18:07]
lawlet's say you're a hosting provider. you own IP 1.2.3.4, but you want it hosted in multiple, geolocation-independant datacenters, with automatic failover
so, you advertise routes for that IP, both with a weight of '5' (for example)
people closer to datacenter A (from a routing standpoint) will naturally filter into datacenter A, and people closer to datacenter B (still from a routing standpoint) will filter into datacenter B, both hitting that IP
what happens if someone is routing-wise equidistant to both A and B?
[18:07]
brycec(there's much lurking, especially on a Friday night) [18:10]
lawhehe fair enough [18:12]
up_the_ironshello law, nice to meet you [18:12]
brycecup_the_irons: o/
(I brought law here with his BGP question because #arpnetworks has the most BGP nerds I've ever seen)
[18:12]
lawnice to meet you too [18:14]
up_the_ironslaw: there is no hard rule for what happens in that case. the bgp route selection algorithm running on the particular device sending out the packets will make a decision. Lookup Cisco's BGP Best Path Selection Algorithm and you'll get an idea of what other factors come into play. [18:14]
lawfair enough. I was asked this in a job interview question the other day, and I had *no idea* :-) [18:15]
up_the_ironsbrycec: lol really? i didn't even know we had lots of bgp nerds... now i know where to ask my own bgp questions ;) [18:15]
bryceclol up_the_irons ;) [18:15]
lawI was asked to design a theoretical web service that was redundant across datacenters, so my immediate thought was 'BGP!' [18:16]
brycec"lots" for BGP isn't exactly a "big number" :P [18:16]
lawI don't have a ton of BGP experience, but I know enough to talk about it at a theoretical level [18:16]
up_the_ironsthat's true [18:16]
lawthen they popped that one on me and my answer was "I'm pretty sure it would more or less evenly split the traffic, but I don't know for sure"
the intent being that if datacenter A got hit by a meteor, that path's weight would automatically drop to 0 since it was no longer active, and everybody would start routing to datacenter B
[18:16]
brycecbrycec loves theoretical meteorites [18:20]
lawmeteorite, backhoe error, bus-meets-telco-pole condition, etc
is that a valid/common usage of BGP, or was I pretty much just talking out of my backside on that one?
[18:21]
brycecVery common [18:21]
laweeeexcellent :-) [18:22]
brycecFor instance, 8.8.8.8 and 8.8.4.4 are both anycast
(that's what it's called, btw - anycast)
[18:22]
lawnot BGP?
or BGP-as-used-for-redundancy-failover?
[18:22]
brycecAnycast is when you broadcast the same /24 from multiple locations and let the routers decide which path to take
It's a specific application of BGP
@wiki anycast
[18:22]
BryceBotAnycast :: Anycast is a network addressing and routing methodology in which datagrams from a single sender are routed to the topologically nearest node in a group of potential receivers, though it may be sent to several nodes, all identified by the same destination address. Addressing methodologies The Internet Protocol and other network addressing systems recognize four main... http://en.wikipedia.org/wiki/Anycast [18:23]
up_the_ironsBut I think you can have anycast without BGP... [18:23]
brycecTrue, technically [18:23]
up_the_ironsthe "one-to-many" relationship in anycast is theoretically possible with any routing protocol [18:23]
lawTIL. thanks! [18:24]
brycec"anycast is usually implemented by using Border Gateway Protocol" keyword "usually" :p [18:24]
up_the_ironslaw: it wouldn't even split traffic in your example above. at least, not on a particular router. The router wouldn't say, "I have two equal cost paths to the same destination, let's load balance the traffic". One route, and one route only, is selected and then installed into the FIB (forwarding information base). I suppose specific configurations could be made to load balance the traffic, but i
haven't seen this done personally in a long time
*evenly
[18:26]
brycecThanks for the clarification [18:27]
up_the_ironsno problem! [18:27]
brycecAnd to be clear (for law), "the router" is referring to the mystical customer that is equidistant between routes [18:27]
up_the_ironsyeah [18:27]
brycecTheir routing equipment would pick a route and stick with it. [18:28]
up_the_ironsyeah [18:28]
brycecyeah [18:28]

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