code logs -> 2016 -> Wed, 20 Apr 2016< code.20160419.log - code.20160421.log >
--- Log opened Wed Apr 20 00:00:06 2016
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05:31
<&McMartin>
https://www.idontplaydarts.com/2016/04/detecting-curl-pipe-bash-server-side/
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22:05
< RobinStamer>
Ugh this is driving me nuts
22:05
< RobinStamer>
I'm reorganizing my network right now.
22:05
< RobinStamer>
I've got four rooms, with a switch each.
22:05
< RobinStamer>
Room A: two plugs (->B, and computer); Room B: three plugs (->A, ->C, computer); Room C: two plugs (->B, ->D [disconnected]); room D: 11+ plugs. Soon as I connect rooms C and D together, I get a broadcast storm.
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22:14
< RobinStamer>
Hokay... so it does the same thing when there's exactly one thing plugged into room D: the C-D line.
22:17
<~Vornicus>
so D's switch sounds like it's doing naughty things
22:46
< RobinStamer>
If I have C-D hooked up, but A-B not, it also works.
22:46
< RobinStamer>
A and D do something that makes it so they won't talk to each other.
22:46
< RobinStamer>
Hmm
22:46
<~Vornicus>
switches don't have mac addresses do they
22:47
< RobinStamer>
A is actually one of those consumer grade wifi "router"s, as is C (though C runs DD-WRT).
22:47
< RobinStamer>
A and D are D-Link devices. B and C are Linksys.
22:47
< RobinStamer>
D is a 24-port switch. B is an 8 port switch.
23:09
< RobinStamer>
Okay. So B-C-D-A works fine, for 10 seconds.
23:12
< RobinStamer>
tcpdump time I guess
23:14
< RobinStamer>
... and it's suddenly not shitting itself
23:14
<&McMartin>
Timing!
23:15
< RobinStamer>
nm
23:17
< RobinStamer>
16:41:38.220192 IP 207.228.118.29.47811 > 232.9.3.27.6288: UDP, length 1328
23:17
< RobinStamer>
16:41:38.220934 IP 207.228.124.68.47811 > 232.9.3.219.6288: UDP, length 1328
23:17
< RobinStamer>
16:41:38.221933 IP 207.228.118.29.47811 > 232.9.3.27.6288: UDP, length 1332
23:17
< RobinStamer>
16:41:38.222008 IP 207.228.118.29.47811 > 232.9.3.27.6288: UDP, length 1328
23:17
< RobinStamer>
16:41:38.222681 IP 207.228.124.68.47811 > 232.9.3.219.6288: UDP, length 1328
23:17
< RobinStamer>
16:41:38.226647 IP 207.228.124.68.47811 > 232.9.3.219.6288: UDP, length 1328
23:17
< RobinStamer>
16:41:38.226905 IP 207.228.118.29.47811 > 232.9.3.27.6288: UDP, length 1328
23:17
< RobinStamer>
That's what tcpdump's picking up
23:18
< RobinStamer>
Neither external interface has IPs like those. I'm using 10.x.x.x internally...
23:21
< RobinStamer>
Okay. So, when A and D are connected, the "computer" on B causes a broadcast storm.
23:21
< RobinStamer>
WTF.
23:27
< RobinStamer>
I'm guessing it doesn't like two exits out onto the open net? (One's at A, the other's at D)
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23:36
< RobinStamer>
... or not?
23:36
< RobinStamer>
The outs are now on A and B, A-B-C-D, everything good, no storm, not seeing those spammed packets at all.
23:42
< RobinStamer>
... ah because it crashed. Soon as it's back on, it destroys the network again.
23:46
< RobinStamer>
Okay, so A-B with out's being A-B, machine plugged in an on, causes a storm.
23:47
< RobinStamer>
Only other variable is the machine on A, which has been plugged in the entire time... but I'm not certain that a Windows 7 machine would be introducing that much into the storm equation.
23:48
< RobinStamer>
Time to see if B is somehow configured to NAT things on any address from the internal side.
23:49
< RobinStamer>
I think so, yeah...
23:49
< RobinStamer>
match out on $ext_if from $lan_net to any nat-to $ext_ip
23:49
< RobinStamer>
pass out on $ext_if from $ext_ip to any
23:55 * Alek headdesks.
23:57
<@Alek>
I'm talking with someone about an incremental game. they're saying that when you buy a new map, you need to leave it empty until you can upgrade research to Y level. I'm saying that it's better to upgrade to X as soon as you can, and then upgrade X to Y when you have enough money, by increments (specifically, 25% cumulative increases).
23:57
<@Alek>
so basically they're saying that it's better to wait because it'll be faster. I agree that it'll be faster then, but am saying that if they start NOW and upgrade incrementally it'll take less time.
23:58
<@Alek>
but they don't get it. and they claim to have a maths degree. -_-
23:58
< crystalclaw>
Maths != statistics or IQ
23:58
<&McMartin>
And it counter-correlates with being able to deal with Actual Numbers >_>
--- Log closed Thu Apr 21 00:00:22 2016
code logs -> 2016 -> Wed, 20 Apr 2016< code.20160419.log - code.20160421.log >

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