#arpnetworks 2015-02-25,Wed

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WhoWhatWhen
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mkbso I sit down at my CentOS desktop and find that it's calmoring to tell me about some notifications it's made up in my absence
the Automatic Bug Reporting Tool and an Update
I've already learned that it expects me to click and swipe up like an iPhone, so I do that
and they appear in the middle of the screen in a transparent window
I didn't know what to do, so I clicked one
that made it disappear
all I know is that the automatic bug reporter was concerned about Firefox, but Firefox hadn't crashed
Firefox does have a lot of bugs though
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aha! it sent a mail to root
but it says firefox crashed and it was still there...
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mike-burnsQuantum crashing. It's both crashed and not crashed at the same time. [07:19]
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milkibut mkb is clearly observing it [08:51]
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grodyit changed it's state as he did [09:28]
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brycec*its [09:43]
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grodyspell check is a pita [10:05]
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RandalSchwartzRandalSchwartz waves [11:47]
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mercutiohmm people were talking about arp on nanog [16:36]
staticsafeindeed [16:37]
mercutiobgp+routed ip
i think interest of small providers doing anycast is growing.
and atm it seems easiest to use different providers which is kind of a pita
[16:45]
staticsafei have PI space but no AS yet so no BGP for me yet [16:50]
mercutiojust a /24? [16:59]
staticsafeyes and a v6 /48 [17:03]
mercutiooh yip [17:07]
mnathani_so.. I managed to get openvpn to provide ipv6 connectivity via a v4 tunnel [17:14]
mercutionice [17:14]
mnathani_now I am having issues getting Router Advertisements to work on a Linux box to provide addressing to LAN hosts [17:14]
acf_using radvd? [17:15]
mnathani_static IPv6 addressing works for hosts behind the tunnel too so thats cool
acf_: I guess thats what I was looking for, wasn't sure what it was called
[17:15]
acf_this is my config: http://paste.unixcube.org/k/96bcb8
/etc/radvd.conf
[17:15]
mnathani_thanks [17:16]
acf_mnathani_: I'm guessing your client boxen are still mtu 1500..
are you having any trouble accessing Google services?
[17:19]
mercutioyou should definitely clamp [17:19]
mnathani_not really using this setup for any real users
mainly testing vms and cisco devices
I really should document the v6 over a v4 tunnel
can radvd provide ipv6 default gateway
[17:20]
acf_yes
that configuration does ^
[17:23]
mnathani_you are right. It was a dns / ipv4 issue [17:27]
acf_I think radvd can do IPv6 DNS [17:29]
mnathani_1452 is the highest packet size I can ping google with [17:30]
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is it necessary to set the mtu on each host, or only the host terminating the vpn? [17:52]
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acf_mnathani_: if path mtu discovery works, just on your VPN endpoint interfaces
but Google doesn't appear to handle PMTUD correctly, at least for IPv6
so you'd need to set the MTU on all of the hosts
[18:44]
mnathani_in some tests I got upto 1402
other tests 1452
probably safe to set mtu to something like 1410
[18:45]
acf_yea
I use 1400 on mine, just to play it safe
[18:46]
mnathani_does that set ipv4 and ipv6 at the same time?
or can you set them independently?
[18:46]
acf_on Linux, that's the interface MTU
for all protocols
I remember setting the MTU on Windows, and I think you might be able to do it per protocol
[18:47]
mnathani_I guess I could try and set separate interface for v4 and v6
s/set/use
[18:47]
BryceBot<mnathani_> I guess I could try and use separate interface for v4 and v6 [18:47]
brycec(In theory, 1280 is the "safest bet" for ipv6 mtu, it's the minimum) [18:53]
mnathani_does mtu have an impact on maximum speed attainable on say a speed test? [19:05]
brycecYes insomuch as it requires a higher packet rate to achieve the same bandwidth. [19:11]
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mnathani_brycec: gotcha [19:41]
brycecIt's not likely to have any /real/ impact on your speed though. [19:42]
mercutioit might for bittorrent
but not for normal traffic
well not much
[19:42]
brycecAnd not on <100mbps pipes [19:43]
mercutiowell ipv6 does increase overhead [19:43]
brycecBut if you're trying to sustain 1gbps for instance, then you start to care about your PPS a lot more. [19:43]
mercutio40 bytes for ip header, 20 bytes for tcp/ip, 12 bytes with tcp options
so that's 72 bytes..
oh right
i would say not really depending on your system
coalescing mostly fixes it.
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mnathani_@google coalescing [20:10]
BryceBot197,000 total results returned for 'coalescing', here's 3
Null coalescing operator - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Null_coalescing_operator) The null coalescing operator (called the Logical Defined-Or operator in Perl, Elvis -operator in Groovy and Kotlin) is a binary operator that is part of the syntax forĀ ...
PHP RFC: Null Coalesce Operator (https://wiki.php.net/rfc/isset_ternary) Sep 6, 2014 ... The coalesce, or ?? , operator is added, which returns the result of its first operand if it exists and is not NULL, or else its second operand.
optimization - Coalesce function for PHP? - Stack Overflow (http://stackoverflow.com/questions/1013493/coalesce-function-for-php) Many programming languages have a coalesce function (returns the ... There is a new operator in php 5.3 which does this: ?: // A echo 'A' ?
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mnathani_brycec: pipe is definitely less that 100meg
s/that/than
[20:16]
BryceBot<mnathani_> brycec: pipe is definitely less than 100meg [20:16]
RandalSchwartznice... gcc built in 31 minutes on SSD. :) [20:30]
mercutiothat seems like a long time
is that with the double build thing
[20:30]
RandalSchwartzonly one process
and whatever freebsd does out of the box
it seems faster than before.
we're live on the SSD now
[20:31]
mercutiogcc used to compile itself with itself after compiling itself with the system compiler [20:31]
RandalSchwartzyeah, I think it did that [20:31]
mercutioi haven't compiled it in years [20:32]
RandalSchwartznow I'm building ffmpeg, and I can't figure out what needs it.
I should just uninstall it and see if anything complains. :)
[20:32]
mercutioi tried using gentoo years back
gnome took hours to buiild
[20:32]
RandalSchwartz"gentoo - for those times when your life isn't slow enough..." [20:33]
mercutioit seemed like a good idea at the time [20:33]
RandalSchwartzthere was a lightning talk at SCaLE about picking a linux distro
it was pretty awesome
[20:33]
mercutioi am finding arch ok [20:33]
RandalSchwartzyeah - the talks aren't archived online yet
I'm building packages at 730/hour :)
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mnathani_anyone pay for dropbox storage? [22:42]

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