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Forum Discussion
skim32
Dec 02, 2011Tutor
ReadyNAS Ultra 4 Plus Jumbo Frame Issue
I am having trouble with jumbo frames with my ReadyNAS Ultra 4+. My setup is as follows. Both My Computer and ReadyNAS goes to the TRENDNET S80G. The TRENDNET S80G supports JF up to 9k MTU. So I ...
StephenB
Jan 10, 2012Guru - Experienced User
It's easy enough to figure out the MTU between the PC and the NAS - then you would know for sure.
Silversurfer79 wrote: I ran a quick test last night and it turns out after copying files up to my Ultra with JF enabled I also got 10-11MB with it off and a reboot 75-85MB.
I still think this is a MTU issue...
Assuming Windows, open a command window and type
ping -f -l 1472 NASNAME
If you see a "packet needs to be fragmented but df set" response, then you have an MTU that is less that 1500.
You can adjust the 1472 number up/down until you find the smallest number that gets the "packet needs to be fragmented..." response. Add 28 to that number and you have the MTU size for the connection.
Though from a practical point of view, just leave jumbo frames off.
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