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[ryanbrown]

I have a Gigabit network all the way through router and computers. Because of my DSL PPoe connection, the MTU on my DIR655 and all computers is set at 1492. Can I still get any benefit by enabling jumbo frame support up to any number higher than the 1500 default? Perhaps I am confusing two unrelated topics but I thought the jumbo frame setting was the DNS-323 mtu setting. If I enable up to whatever..9000...does this then conflict with the rest of my network and cause issues?

Thanks,

[fordem]

In a nutshell - no - go right ahead and use jumboframe on the local network.

Just make sure that the network path connecting any two devices that are configured for jumboframe also supports jumboframe, upto the frame size you plan to use and everything will work fine - a connection between a device configured for jumboframe and one using a standard frame size will automatically negotiate down to the common MSS (maximum segment size - a parameter conceptually similar to MTU)

Your router most likely does not support jumboframe (I'm talking the router itself, not the integrated network switch) so data from a jumboframe device to the router will be sent using 1500 byte frames and there should be no problem with fragmentation.

[ryanbrown]

That sounds like then that there would not be any benefit to enabling the Jumbo Frame? Do I understand you correctly?

[fordem]

No - you do not.

Depending on the equipment involved you should see an increase of 10~50% in throughput when using jumboframe.

What I had previously outlined was what happens when you are transferring data between endpoints where one supported jumboframe and the other does not, there will be no benefit to using jumboframe there, because it's not supported.

If you have equipment that supports jumboframe, enable jumboframe and do your own tests, all you have to lose is your time.

[bigclaw]

It might help if you visualize your router as two parts (which it is)--the router part that talks to the Internet (i.e. WAN) and the switch part that's part of your LAN. The traffic between your LAN PCs only go through the switch part and are not affected by the PPPoE MTU setting you set on the router.

[ryanbrown]

Ahhhh.....I see the light bigclaw! Thank you!

Any free tools you would recomend to test transfer rates?

[fordem]

Try searching this forum for NASTester - there is another thread in which I posted a link.  It's a little utility that creates, transfers & times a file with a size specified by you, up to 2GB, to a network share that you map a letter to.  It does reads & writes and can do multiple tests and average the results.