X95 Slow upload speed from Macs
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I have a very strange problem.
Since upgrading to firmware version 1.2.3 on my X95(EU) the WiFi upload speed on both my Macs (M1 MacBook Pro, and M1 Max Mac Studio) are limited to around 20-30 Mbps.
I have 900/900Mbps download and upload broadband, and I used to typically get 400-600 Mbps download and upload speeds when tested with Oookla Speedtest.
What is strange though is that if I run Speedtest on my iPhone, iPad, or my wife's iPad I still get 400-600 Mbps upload speeds. The limited upload speed ONLY happens on my two Macs.
If I take my MacBook Pro to work and connect to the office WiFi I get full speed uploads as well as downloads.
There's something very odd going on with the the Macs and the X95 with firmware 1.2.3.
Changing QOS settings etc doesn't make any difference.
Hi @David-TP
Thanks for the welcome. I've managed to track this down, but I'm not sure why it is the way it is.
It's down to the MTU setting. The MacOS Sonoma default is 1500, but this seems to be too large for the X95 to handle
If I run a ping sweep starting with a packet size of 1300 and increasing by 10 bytes up to 1500 you can see it starts to fail at 1438
ping -g 1300 -G 1500 -h 10 -D www.google.com PING www.google.com (142.250.180.4): (1300 ... 1500) data bytes 76 bytes from 142.250.180.4: icmp_seq=0 ttl=55 time=24.939 ms wrong total length 96 instead of 1328 76 bytes from 142.250.180.4: icmp_seq=1 ttl=55 time=13.228 ms wrong total length 96 instead of 1338 76 bytes from 142.250.180.4: icmp_seq=2 ttl=55 time=14.702 ms wrong total length 96 instead of 1348 76 bytes from 142.250.180.4: icmp_seq=3 ttl=55 time=15.042 ms wrong total length 96 instead of 1358 76 bytes from 142.250.180.4: icmp_seq=4 ttl=55 time=12.936 ms wrong total length 96 instead of 1368 76 bytes from 142.250.180.4: icmp_seq=5 ttl=55 time=21.443 ms wrong total length 96 instead of 1378 76 bytes from 142.250.180.4: icmp_seq=6 ttl=55 time=13.464 ms wrong total length 96 instead of 1388 76 bytes from 142.250.180.4: icmp_seq=7 ttl=55 time=17.616 ms wrong total length 96 instead of 1398 76 bytes from 142.250.180.4: icmp_seq=8 ttl=55 time=12.478 ms wrong total length 96 instead of 1408 76 bytes from 142.250.180.4: icmp_seq=9 ttl=55 time=16.539 ms wrong total length 96 instead of 1418 76 bytes from 142.250.180.4: icmp_seq=10 ttl=55 time=13.927 ms wrong total length 96 instead of 1428 ping: sendto: Message too long ping: sendto: Message too long Request timeout for icmp_seq 11 ping: sendto: Message too long Request timeout for icmp_seq 12 ping: sendto: Message too long Request timeout for icmp_seq 13 ping: sendto: Message too long Request timeout for icmp_seq 14 ping: sendto: Message too long Request timeout for icmp_seq 15 ping: sendto: Message too long Request timeout for icmp_seq 16 ping: sendto: Message too long Request timeout for icmp_seq 17 ping: sendto: Message too long Request timeout for icmp_seq 18 ping: sendto: Message too long Request timeout for icmp_seq 19 --- www.google.com ping statistics --- 21 packets transmitted, 11 packets received, 47.6% packet loss round-trip min/avg/max/stddev = 12.478/16.029/24.939/3.757 ms
If I select Configure Manually the maximum size I can enter is 1436, and if I do that then everything is back to full speed.
So there's some issue between the way MacOS Sonoma, or my two Mac running Sonoma anyway, and the X95 automatically negotiating the correct MTU.
Any idea why the max MTU on the X95 is only 1436?
Thanks,
Woz