How To Enable Jumbo Frames

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AndreS4579

Transfer speeds were around 300 kb/s.

Enabled Jumbo Frames at 4KB MTU,

Transfers are now 6-7 mb/s.

Settings other than MTU were erratic and slower.

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JEEPMON

I am sure this is the most common and popular setup and a very important question. say you have several computers in your house all hard wired (ethernet)up through a wireless router that is connect to a moden (dsl or cable) to the internet. There is also a NAS or a home server for sharing,backups, and storage. All of the computers support jumbo frames as well as the router and the NAS. I can see ho jumbo frames would help if enables for transfers to and from the computers and the server/NAS. BUT will enabling the jumbo frames make for slower more fragmented packets when the computers are connecting to the internet and downloading stuff? The cable/DSL modem is only 10/100 no gigabit or jumbo frames. Will enabling jumbo frames hurt internet connections and downloads in this setup?

avatar

JEEPMON

I am sure this is the most common and popular setup and a very important question. say you have several computers in your house all hard wired (ethernet)up through a wireless router that is connect to a moden (dsl or cable) to the internet. There is also a NAS or a home server for sharing,backups, and storage. All of the computers support jumbo frames as well as the router and the NAS. I can see ho jumbo frames would help if enables for transfers to and from the computers and the server/NAS. BUT will enabling the jumbo frames make for slower more fragmented packets when the computers are connecting to the internet and downloading stuff? The cable/DSL modem is only 10/100 no gigabit or jumbo frames. Will enabling jumbo frames hurt internet connections and downloads in this setup?

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DrGerm

I see that Jumbo Frames might help with transferring large files (like an ISO or a large VOB file) but does this help with streaming these same files. I have a server that I connect to a theatre PC and use MyMovies and have a mixed library of DVD folders and Blu-Ray ISO's. Any thoughts?

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theresapartyinm...

If you are just sending a steady stream of voice packets or packets from games the larger MTU will never be used. If jumbo frames are going out with voice packets yes there will be a latency gain, but it's the same latency gain that 1518byte frames cause. The data packets larger than a voice frame being transmitted quickly will cause latency due to lack of priority for the voice packets, not the size of the frames.

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sotoa

I've read about jumbo frames in the past and according to smallnetbuilder.com, he suggests that you use 4K.  My switches are jumbo frame capable but not my routers.  I figure I can at least copy from computer to computer a little faster.

One thing I've noticed, the new Dell Vostro line has gigabit lan, but no jumbo frame option at all.  I wonder why.

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gendoikari1

The device properties for my network adapter (Marvell Yukon 88E8056) doesn't have "Jumbo Frame", but rather "Jumbo Packet", with settings of 1514 (default), 4088 and 9014 bytes. Probably depends on adapter.

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BluePhoton

What is a normal throughput for an optimized home network?

I was getting ~4MB/s throughput while copying large files from a local computer to my NAS.  I then switched to Teracopy, and the throughput went up to about ~11MB/s.  But is that good? 

 

 

 

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aviaggio

Not really. Sounds like fast Ethernet (100 Mb/s = 12.5 MB/s), not gigabit. With gigabit you should see speeds in the 35-55 MB/s range.

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bear

Another option is to use an old-school technique used for getting the most out of that fax/modem:

ping -f -l <mtu size> <ip of lan machine with most hops from the one you're pinging on>

and adjust the mtu size until the packets are no longer fragmented.

For instance:

5 gigabit hops from 192.168.0.100 to 192.168.0.263

C:\Documents and Settings\192.168.0.100>ping -f -l 9216 192.168.0.263

if the MTU is too high, you'll get a message:

"Packet needs to be fragmented but DF set."

just keep lowering it until you no longer get that message. That's likely where you'll find the "sweet spot" for your network.

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