Samba with Jumb MTU Problem?

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Level 1

5 points

Samba with Jumb MTU Problem?

I have a Suse 10 Linux file server running Samba. My iMac Core Duo is connected to the Suse server via a Gigabit network. The switch, Linux box, and iMac all specify that they support MTU of 9000.

However, I can not get the iMac to connect to the Samba server on the Linux box, if the iMac's MTU is set to 9000. (Even when the Linux box also has an MTU of 9000.)

20" Imac Core Duo, Mac OS X (10.4.6)

Posted on Jun 15, 2006 9:36 AM

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Answer 1

mecklists

Level 4

1,795 points

Jun 16, 2006 7:12 PM in response to moulles

Does the connection work without a switch between the two boxes? With gigabit, either a straight-through or cross-over cable should work.

bill

1 GHz Powerbook G4 Mac OS X (10.4.6)

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Answer 2

Jun 16, 2006 8:56 PM in response to moulles

Have you tried setting these options in Samba (both on Linux and OS X)?

read size = 65535
max xmit = 65535
socket options = TCP_NODELAY SO_SNDBUF=65535 SO_RCVBUF=65535

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Answer 3

moulles Author

Level 1

5 points

Jun 18, 2006 3:08 AM in response to Trevor Seward

Yup. That's been set from day one.

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Answer 4

moulles Author

Level 1

5 points

Jun 18, 2006 3:09 AM in response to mecklists

Good idea.

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Answer 5

moulles Author

Level 1

5 points

Jun 18, 2006 3:15 AM in response to moulles

So, upon further investigation, it's actually a switch problem.

I have a Netgear GS605. Netgear, ever so 'delightfully', has two hard to discern, not overtly obvious, revs of this gigabit switch. One of them handles Jumbo Frames and QoS. The older one doesn't. When you go to their site to comparison shop, the product page does't even note this. You must dig through their knowledgebase errata. They don't even bother to note on the box if the unit is a version 1 or version 2. You need to know a specific serial number prefix. Pretty lame if you ask me.

They must be taking a page from Apple on rev 1 hardware.

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