Hacker News Board Hacker News, browsed like a classic message board
Live data from Hacker News

Tell HN: Hacker News now supports IPv6

news.ycombinator.com

Post reply on HN
Print view View original

51–60 of 396 posts

Re: Tell HN: Hacker News now supports IPv6

#51

Post by greyface- »

londons_explore wrote: post #50
pilif wrote: post #49

Earlier quoted context omitted.

One of the features of IPv6 is address autoconfiguration, obviating the need for a central authority like DHCP on v4. However, that only works with a /64 prefix and given that larger sites might want to have multiple subnets, that’s why most assignments are /56 or /48. But still. If all assignments were /48s, that would still leave room for 281 trillion networks which even I believe is enough for the foreseeable futu…

> However, that only works with a /64 prefix Well it should be redesigned so it works all the way down to individual addresses.

You can use DHCPv6 instead of SLAAC if you need autoconfiguration on sub-/64 prefixes.

Re: Tell HN: Hacker News now supports IPv6

#52

Post by lmm »

londons_explore wrote: post #50
pilif wrote: post #49

Earlier quoted context omitted.

One of the features of IPv6 is address autoconfiguration, obviating the need for a central authority like DHCP on v4. However, that only works with a /64 prefix and given that larger sites might want to have multiple subnets, that’s why most assignments are /56 or /48. But still. If all assignments were /48s, that would still leave room for 281 trillion networks which even I believe is enough for the foreseeable futu…

> However, that only works with a /64 prefix Well it should be redesigned so it works all the way down to individual addresses.

> Well it should be redesigned so it works all the way down to individual addresses.

Why? What's wrong with how it works at the moment?

Re: Tell HN: Hacker News now supports IPv6

#54

Post by notatoad »

baby_souffle wrote: post #10

Ha! Beat me to it! For anybody that's curious, the IP-Foo [0] browser extension puts a little 4/6 icon in the address bar to make it clear at a glance which dialect you're speaking for $currentWebPage [0]: https://github.com/pmarks-net/ipvfoo

cool, but "read and change your data on all websites" is imho not worth the functionality. that seems ripe for takeover by some scammer.

Re: Tell HN: Hacker News now supports IPv6

#55

Post by bqmjjx0kac »

rumdz wrote: post #36

Does ipv6 result in higher latencies? I could see larger addresses increasing latency, but then again I could also see a more efficient protocol resulting in lower net latency. I should probably read a book describing the differences.

Verizon Fios recently rolled out IPv6 last year and I swear IPv6 traffic is deprioritized. Sometimes it just cuts out entirely.

Re: Tell HN: Hacker News now supports IPv6

#56

Post by lolinder »

tilwidnk wrote: post #28
SamuelAdams wrote: post #4

Earlier quoted context omitted.

Can you explain this more? Why are you so tied to ipv4? I recently enabled IPv6 on my home network, and roughly 30-40% of all internet traffic goes through IPv6. Things are noticeably faster, especially connection times to online games on Xbox Live. My only complaint is that my ISP keeps changing the prefix every quarter or so, so my static addresses need to be updated in the firewall and other places. I am looking i…

> Can you explain this more? Why are you so tied to ipv4? For me, IPv4 doesn't break the privacy barrier, IPv6 blasts a huge hole straight into each and every household, office and IoT device on the planet. No, privacy fixes put into IPv6 do not work.

Can you explain this more? I realize that one IP address per device poses a major problem for privacy, but I thought we somewhat mitigated that by dynamically reassigning IPs.

What exactly is the problem with the privacy fixes that were put into IPv6? Why don't they work?

Re: Tell HN: Hacker News now supports IPv6

#57

Post by abrookewood »

supertrope wrote: post #16
teaearlgraycold wrote: post #6

Earlier quoted context omitted.

Why would things be faster over v6?

Simpler routing because address blocks are not fragmented. IPv6 does not have a header checksum so that's one less task for routers. Packet fragmentation is no longer done by routers. IPv6 capable gear tends to be newer and higher performance. There's no NAT step or even worse CGNAT.

For those that were wondering: Unlike in IPv4, IPv6 routers never fragment IPv6 packets. Packets exceeding the size of the maximum transmission unit (MTU) of the destination link are dropped and this condition is signaled by a Packet too big ICMPv6 message to the originating node, similarly to the IPv4 method when the Don't Fragment bit is set.

Re: Tell HN: Hacker News now supports IPv6

#58

Post by [deleted] »

notatoad wrote: post #54
baby_souffle wrote: post #10

Ha! Beat me to it! For anybody that's curious, the IP-Foo [0] browser extension puts a little 4/6 icon in the address bar to make it clear at a glance which dialect you're speaking for $currentWebPage [0]: https://github.com/pmarks-net/ipvfoo

cool, but "read and change your data on all websites" is imho not worth the functionality. that seems ripe for takeover by some scammer.

[deleted]

Re: Tell HN: Hacker News now supports IPv6

#59

Post by lmm »

rumdz wrote: post #36

Does ipv6 result in higher latencies? I could see larger addresses increasing latency, but then again I could also see a more efficient protocol resulting in lower net latency. I should probably read a book describing the differences.

In theory, any impact from longer addresses would be outweighed by the benefit of the shorter non-CIDR routing table (and in turn that should be outweighed by avoiding NAT, and that should be outweighed by avoiding CGNAT). (Plus with most systems being natively 64-bit these days, that impact should be 0 - the routable part of an IPv6 address is 64 bits, and comparing a 64-bit value is no harder than comparing a 32-bit value).

In practice IPv6 is newer, which has good and bad sides; IPv6 routing paths are more likely to be using newer (and therefore faster) equipment, but there's also a bigger risk of someone making a mistake that messes up your routing/latency, particularly if your ISP hasn't been doing IPv6 for very long.

Re: Tell HN: Hacker News now supports IPv6

#60

Post by scheme271 »

greyface- wrote: post #51
londons_explore wrote: post #50

Earlier quoted context omitted.

> However, that only works with a /64 prefix Well it should be redesigned so it works all the way down to individual addresses.

You can use DHCPv6 instead of SLAAC if you need autoconfiguration on sub-/64 prefixes.

Some systems like android don't support anything but SLAAC
Post reply on HN