I've just moved house and have taken my Plusnet fibre with me. As part of this I've upgraded from the tg582n router to the Hub One. When testing the network on my PS4 (which is assigned to the DMZ and hardwired) I'm seeing the warning message "The router in use might not support IP packet fragmentation, and some network features of the PS4 might be restricted. For details contact the manufacturer.".
There are one or two threads already discussing this issue but the only real solution seems to be to change the router.
I still have my old router and have tested it as compared to the hub one at the site http://www.letmecheck.it/mtu-test.php. The Hub One mtu is 1488 and the tg582n mtu is 1492. Why the difference and will this be fixed in the Hub One? I'm quite disappointed that an upgrade to a newer better router might cause me problems when playing online.
Here are the full results:
Plusnet Hub One
Sending 32 bytes to 91.125.174.206 <- not fragmented
Sending 750 bytes to 91.125.174.206 <- not fragmented
Sending 1125 bytes to 91.125.174.206 <- not fragmented
Sending 1313 bytes to 91.125.174.206 <- not fragmented
Sending 1407 bytes to 91.125.174.206 <- not fragmented
Sending 1454 bytes to 91.125.174.206 <- not fragmented
Sending 1478 bytes to 91.125.174.206 <- FRAGMENTED!
Sending 1466 bytes to 91.125.174.206 <- FRAGMENTED!
Sending 1460 bytes to 91.125.174.206 <- not fragmented
Sending 1463 bytes to 91.125.174.206 <- FRAGMENTED!
Sending 1461 bytes to 91.125.174.206 <- FRAGMENTED!
Sending 1460 bytes to 91.125.174.206 <- not fragmented
From the tests we did, we can assume that 1460 bytes is the largest unfragmented packet
size. The MTU size would be 1488, made up from 1460 payload and 28 ICMP/IP Headers
and payload information.
The current maximum payload size is not divisible by 8.
The actual size of the payload (data) will be limited to: 1456
The maximum MTU size for 91.125.174.206 is: 1488
Old Plusnet tg582n
Sending 32 bytes to 80.189.34.94 <- not fragmented
Sending 750 bytes to 80.189.34.94 <- not fragmented
Sending 1125 bytes to 80.189.34.94 <- not fragmented
Sending 1313 bytes to 80.189.34.94 <- not fragmented
Sending 1407 bytes to 80.189.34.94 <- not fragmented
Sending 1454 bytes to 80.189.34.94 <- not fragmented
Sending 1478 bytes to 80.189.34.94 <- FRAGMENTED!
Sending 1466 bytes to 80.189.34.94 <- FRAGMENTED!
Sending 1460 bytes to 80.189.34.94 <- not fragmented
Sending 1463 bytes to 80.189.34.94 <- not fragmented
Sending 1465 bytes to 80.189.34.94 <- FRAGMENTED!
Sending 1464 bytes to 80.189.34.94 <- not fragmented
Sending 1465 bytes to 80.189.34.94 <- FRAGMENTED!
Sending 1464 bytes to 80.189.34.94 <- not fragmented
From the tests we did, we can assume that 1464 bytes is the largest unfragmented packet
size. The MTU size would be 1492, made up from 1464 payload and 28 ICMP/IP Headers
and payload information.
The maximum MTU size for 80.189.34.94 is: 1492
Thanks.
