The fragmenting can happen at literally any point between the two hosts. There is almost certainly nothing you can do about it. Any "hop" along the way has the right to split packets if it feels it's necessary. If the trouble started recently, you should contact your ISPs to complain.

For troubleshooting, you might try running a cable directly between the two affected hosts. Make sure you choose a media format that supports long distances. I don't think CAT6 will go to China without repeaters, and that would defeat the purpose.

If the issue is that the route your packets take has changed, maybe you can find a VPN provider who will treat your packets better? I have many friends here in Texas who pay monthly for a VPN to New York because routing Netflix through it is faster than going straight to Comcast.

David

PS - I can't speak for the audio industry, as I'm in web hosting, where dark humor is our only defense against the knowledge that the worst technology will almost always win. JavaScript, PHP, VHS, x86 processors with segment:offset addressing...

On 04/07/16 06:57, Kenneth Fields wrote:

Hi all,

I’ve been having a constant noisy signal lately using jacktrip 1.1 and jack audio 0.92 beta3 on El Capitan.

No noise running locally; but always from U.S. to China on ipv6. We’ve even had trouble with initializing an

8 channel stream; had to go with 4. Never had this trouble before.

The connection is virtually jitter-less with 0 packet loss and 80M in the clear.

doing some experiments with jacktrip and Wireshark today - all on the local network.

I find that with larger data chunks (over about 1500k), the packets can be fragmented 2 or 3 times or more.

Where does the fragmenting happen, on sender side? In transit?

Would the machine ever have any problem ‘reassembling” the chunks?

Thanks,

Ken

stereo 48k 24bit connection:

buffer 512

3 FRAGS

OVER IPV6

315345 2454.541857 2001:da8:22b:1506:12dd:b1ff:febd:8a2e 2001:da8:22b:1506:ca2a:14ff:fe34:2beb IPv6 1510 IPv6 fragment (off=0 more=y ident=0xf68b8b47 nxt=17)
315346 2454.541861 2001:da8:22b:1506:12dd:b1ff:febd:8a2e 2001:da8:22b:1506:ca2a:14ff:fe34:2beb IPv6 1510 IPv6 fragment (off=1448 more=y ident=0xf68b8b47 nxt=17)

315347 2454.541863 2001:da8:22b:1506:12dd:b1ff:febd:8a2e 2001:da8:22b:1506:ca2a:14ff:fe34:2beb UDP 262 4464 → 4464 Len=3088 4464 4464

OVER IPV4

488313 2895.589371 10.1.8.32 10.1.8.39 IPv4 1514 Fragmented IP protocol (proto=UDP 17, off=0, ID=2841) [Reassembled in #488315]

488314 2895.589383 10.1.8.32 10.1.8.39 IPv4 1514 Fragmented IP protocol (proto=UDP 17, off=1480, ID=2841) [Reassembled in #488315]

488315 2895.589385 10.1.8.32 10.1.8.39 UDP 170 4464 → 4464 Len=3088 4464 4464

[3 IPv4 Fragments (3096 bytes): #744530(1480), #744531(1480), #744532(136)]

[Frame: 744530, payload: 0-1479 (1480 bytes)]

[Frame: 744531, payload: 1480-2959 (1480 bytes)]

[Frame: 744532, payload: 2960-3095 (136 bytes)]

[Fragment count: 3]

[Reassembled IPv4 length: 3096]

[Reassembled IPv4 data: 117011700c18119cc7a5b325e02f050002a7000203180200...]

MONO 44k 16 bit, buffer 128 - NO FRAGS

878806 3832.932229 10.1.8.39 10.1.8.32 UDP 314 4464 → 4464 Len=272 4464 4464

1006386 4103.078745 2001:da8:22b:1506:ca2a:14ff:fe34:2beb 2001:da8:22b:1506:12dd:b1ff:febd:8a2e UDP 334 4465 → 4465 Len=272 4465 4465

STEREO 16 bit, buffer 128 - NO FRAGS

1088352 4253.388686 2001:da8:22b:1506:ca2a:14ff:fe34:2beb 2001:da8:22b:1506:12dd:b1ff:febd:8a2e UDP 590 4464 → 4464 Len=528 4464 4464

Buffer 256 16bit - NO FRAGS

1267127 4884.016193 2001:da8:22b:1506:ca2a:14ff:fe34:2beb 2001:da8:22b:1506:12dd:b1ff:febd:8a2e UDP 1102 4469 → 4469 Len=1040 4469 4469

Buffer 256 24bit - 2 FRAGS

1326725 5095.511528 2001:da8:22b:1506:ca2a:14ff:fe34:2beb 2001:da8:22b:1506:12dd:b1ff:febd:8a2e IPv6 1510 IPv6 fragment (off=0 more=y ident=0x486bd035 nxt=17)

1326726 5095.511529 2001:da8:22b:1506:ca2a:14ff:fe34:2beb 2001:da8:22b:1506:12dd:b1ff:febd:8a2e UDP 174 4471 → 4471 Len=1552 4471 4471

1528363 5497.529358 10.1.8.32 10.1.8.39 IPv4 1514 Fragmented IP protocol (proto=UDP 17, off=0, ID=a448) [Reassembled in #1528364]

1528364 5497.529361 10.1.8.32 10.1.8.39 UDP 114 4473 → 4473 Len=1552 4473 4473
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