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#1 2009-01-22 10:49:24

pbls
Member
Registered: 2008-11-20
Posts: 15

Jumbo Frames :p

Hi there i have a question,my pc nic is a Marvell Yukon 88E8056 PCIE Gigabit controller  and is connected to a DLink DGL-4300 router,my NIC has jumbo Frames enabled ( and thers no disabled setting) and when i try to enable Jumbo frames im my DNS-323 it simply  becomes out of reaching the configuration web page, stands on refreshing and doesn΄t connect.
  I know my router doesn΄t have jumbo Frames,could that be the source of the problem?

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#2 2009-01-22 11:20:01

Apskaft
Member
From: Karlskrona, Sweden
Registered: 2007-01-09
Posts: 165

Re: Jumbo Frames :p

First, check your current settings using:

Code:

netsh interface ipv4 show interfaces

Will give something like this as output:

Code:

Idx Met MTU State Name
— — —– ———– ——————-
1 50 4294967295 connected Loopback Pseudo-Interface 1
17 25 1500 connected Wireless Network Connection 1
19 25 1500 connected Wireless Network Connection 2

If MTU is larger than 1500 then you have jumbo frames enabled and you can control it using:

Code:

netsh interface ipv4 set subinterface “17″ mtu=1500 store=persistent

netsh is located in \windows\system32


However, I fear this is not the source of your problem.

/Apan

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#3 2009-01-22 15:01:26

fordem
Member
Registered: 2007-01-26
Posts: 1938

Re: Jumbo Frames :p

Short answer - yes your router is the problem.

Long answer ...

If the router (or switch) connecting two devices that are configured for jumbo frame does not support jumbo frame, you WILL lose the connection - the two devices will negotiate the MSS (maximum segment size) and if the router or switch does not support that segment size, it will simply discard the packets.

So - since your router does not support jumbo frame, when you configure the second of the two devices (in this case the DNS-323), the connection will fail.  If you're curious about jumbo frame performance, set static ip addresses on both the PC and the DNS-323 and then connect them directly to one another with a cable that has all four pairs wired - it will automatically cross-over.

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#4 2009-01-22 18:30:53

pbls
Member
Registered: 2008-11-20
Posts: 15

Re: Jumbo Frames :p

Thank you all.

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