ay

37 ms·

331.
by ay 12y ago
That's not what I said. There are plenty of very real and very painful ways to shoot oneself in the foot with IPv6, especially in a larger kind of network that I can imagine the folks at MIT have. But based on my experience with runnin
332.
by ay 12y ago
University campus typically have similar, although a bit less dynamic pattern of usage, than conference type scenarios. We actually observed on different (not just conference, but also campus) that wireless networks in general seem to have
333.
by ay 12y ago
Oh, "same as" cases are indeed all over, e.g. the EUI-64 https://standards.ieee.org/develop/regauth/tut/eui64.pdf I was looking for the example of the sparkly unicorn protocol from 2000 the people s
334.
by ay 12y ago
It's a very noble goal, and a pity HN has only one upvote per reader :-) But, designing a ship that 10 years post-release can fly and dig under ground on a whim is a pretty high bar - and would be interesting to learn of successes else
335.
by ay 12y ago
A very astute observation! But... There are already quite large both enterprise and service provider networks already using IPv6. It's more in-between the "pioneers did not document the thorns they hit, so the others would not&quo
336.
by ay 12y ago
Millions of people are using it today, one and a half decades after it was conceived. It's not perfect but nothing is. If you have examples of tech to compare with - please bring them in! EDIT: and yeah, a lot of knobs does sound like
337.
by ay 12y ago
Don't mix the "mad professors" and those who has to ensure the lights are on. The criteria are very different. The consequences for the widespread IPv6 adoption is that one needs to do more RTFM and know vendor's escalat
338.
by ay 12y ago
Everything unknown of is untrivial - and I'll leave it at that.
339.
by ay 12y ago
You are completely right. Privacy IPv6 address are an illusion when used in a household that has effectively an active /64 per subscriber. (Those who say "but IPv4..." last time my IPv4 address changed, was half a year ago).
340.
by ay 12y ago
They're enabled on quite some of the Linux distros. And if someone did not know the consequences of what they were doing when they decided to play with the reachable/valid lifetimes on the prefix, they could end up with a lot of
341.
by ay 12y ago
Set your reachable and valid lifetimes to the max. Though you will still end up cycling through some of the privacy address, it's not going to be bad.
342.
by ay 12y ago
The "issues with IPv6" are with education, operation, configuration. I personally ran WiFi networks with 8000+ wireless clients on a single /64 subnet (my employer's CiscoLive conference), and assisted/consulted i
343.
by ay 12y ago
The most hardship, from experience, comes from the apps, especially the home-grown ones. Let me back this up with an anecdote from experience in dual-stacking the websites at my employer (a curious reader might notice that cisco.com, downlo
344.
by ay 12y ago
No, only the live connections are counted - it's based on what address family content providers see in incoming connections. So you are in the remaining 89% for now... Try http://testipv6.com/helpdesk and mail me the r
345.
by ay 12y ago
Yes, in my reply to tgflynn in https://news.ycombinator.com/item?id=8272923 there's an attempt to argue about the numbers. Also, another factor which will kick in as more and more folks get IPv6 is that maintaining bot
346.
by ay 12y ago
Let's take a look at the Internet itself. https://www.ietf.org/rfc/rfc791.txt is dated 1981. Figure 1 in http://www.census.gov/prod/2013pubs/p20-569.pdf shows that the first time they re
347.
by ay 12y ago
"Even IPv6 hasn't picked up" - this needs correction. http://6lab.cisco.com/stats/ https://www.google.com/intl/en/ipv6/statistics.html#tab=per-... http://www.wo
348.
by ay 12y ago
Nope, I just tried and went into a pitch-black room with a remote control whose LED on the Mac camera looks very bright, and tried to look at it while activating the LED - nothing, not a blip, I can not see the IR LED with my eyes...
349.
by ay 12y ago
I don't have HTC One to make a comparison - but if you have some "vanilla" remotes laying around and can see the IR LEDs blink in all of them when active - then yeah, probably you do see into the IR and I don't!
350.
by ay 12y ago
That's pretty fascinating if you can see it. I just tried with three different remotes - and alas, I can't see a thing, no matter how hard I try. All three give very bright flash when viewed via my Mac's camera (just launchin
351.
by ay 12y ago
Good conclusion in that article! Sometimes (actually quite often in practice) neither of the parties does anything blatantly wrong, but just bends the assumptions in slightly different directions, together becoming a trigger for a failure.
352.
by ay 12y ago
Troubleshooting the issue similar to (1) was one of my interview questions for a while - though with HTTP. It's a treasure trove of discussion at very different levels. Another "fun" (and hard to debug for the first time) is
353.
by ay 12y ago
Did you happen to keep that bad cable ? Would be terribly interesting to see which kinds of bitpatterns would trigger it.
354.
by ay 12y ago
Oh yes, crypto checksum is always useful. Another bug (also eons ago) was where something was trying to patch the TCP options, with a very lax assumption about the packet - as a result with some way fragmentation it would think it was patch
355.
by ay 12y ago
Reminded me of a problem I had been debugging ages ago. The initial complaint was that the particular file transfer through a firewall was hanging. Further tests: it hangs at the same place. More testing: not just this file, some other file
356.
by ay 12y ago
The python is quite fine at doing the TCP indeed, muXTCP is the proof. Being implemented around Twisted, it actually allows you to fiddle with low-level TCP stuff, while e.g. offloading the SSL to the existing stack. It saved my bacon a few
357.
by ay 12y ago
I am trying to send "A", but it keeps sending "E" - anyone else noticed that ? edit: seems like I have been timing it badly. Does work now well.
358.
by ay 12y ago
Oh, indeed! The basic argument is "keeping state is more expensive and fragile than not keeping it". BTW, speaking of MAP: the CPE-side code is now in OpenWRT trunk. I have built a few images here, in case someone is interested to
359.
by ay 12y ago
Running a box that smoothly maintains hundreds of millions of sessions (a household might would peak at about 1000 concurrent sessions) is a different expense than running boxes that just statelessly route the packets for those hundreds of
360.
by ay 12y ago
"Black hole" is not really an obscenity in Russian as much as it isn't in English. But the paper you quoted does seem to explain the logic for this term's existence: "The resulting system has been variously termed “

More ›