IP Fragmentation - Not reliable over the Internet?
kris at kriskinc.com
Fri Sep 20 12:54:51 UTC 2013
I know I'm digging up an old thread here but I've spent some time
analyzing some of the significant changes that Apple has made to the
Facetime protocol, apparently with a huge focus on IP packet size to
avoid fragmentation issues:
I'm betting they've had HUGE issues with IP+UDP MTU issues over the
last three years...
On Sun, Sep 1, 2013 at 4:34 PM, Emile Aben <emile.aben at ripe.net> wrote:
> On 31/08/2013 13:13, Randy Bush wrote:
>> could you please test with ipv6?
> This is what I see for various IPv6 payloads (large ICMPv6 echo
> requests) from all RIPE Atlas probes that where available at the time to
> a single "known good" MTU 1500 destination:
> plen fail% nr_probes
> 100 9.64 1266
> 500 9.34 1039
> 1000 9.94 1298
> 1240 9.94 1308
> 1241 11.62 1300
> 1440 12.70 890
> 1441 14.70 1306
> 1460 15.18 1304
> 1461 19.84 1290
> 1462 22.02 1294
> plen: IPv6 payload length (ie. not including 40byte IPv6 header)
> fail%: percentage of probes that didn't get any of the 5 pkts that were
> sent. Note that there is a large baseline failure rate in IPv6 on RIPE
> Atlas probes , which would explain the ~10% failure rate for the
> smaller packets.
> I plan to do more analysis and start writing this up on RIPE Labs over
> the next few days.
> Emile Aben
> RIPE NCC
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