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How to Enable Jumbo Frames

southerndoc

southerndoc

Contributor
Original poster
May 15, 2006
1,874
533
USA
I'm trying to enable jumbo frames (either 4000 or 9000) to speed up backups, disk access to NAS, etc.

I'm currently using a DS213+. I'm planning on purchasing a 414+ sometime in the near future.

All of my switches (Linksys LGS308P's and LGS318P) have enabled jumbo frames selected.

Anytime I try to access work email or the student's address, we can't.
 
My recommendation:

You'll probably need multiple network interfaces and put the jumbo frame equipment on a dedicated network. You won't be able to talk to other machines on the Internet over the jumbo frame interface if the MTU is actually turned up.

Put the jumbo frame equipment on its own private switch and subnet to let them talk to each other. Use an alternate interface (wireless or some other ethernet adapter) to talk to the Internet.
 
southerndoc said:
I'm trying to enable jumbo frames (either 4000 or 9000) to speed up backups, disk access to NAS, etc.

I'm currently using a DS213+. I'm planning on purchasing a 414+ sometime in the near future.

All of my switches (Linksys LGS308P's and LGS318P) have enabled jumbo frames selected.

Anytime I try to access work email or the student's address, we can't.
Click to expand...

IME jumbo frames aren't worth the effort, especially if you have a mixed network of Gigabit and non-Gigabit links.
Presumably you know how to set Jumbo Frames in System Preferences (Network>Advanced>Hardware>Configure Manually) ?
 
Last edited:
Was able to get it working after I routed everything through the switch in my basement. Basically the router has LAN1 connected to the LGS318P switch and LAN2-4 empty.

Set the MTU's to 9000 manually (previously this wouldn't work; caused Time Machine to fail when backing up to my Synology DiskStation and wouldn't allow other Macs to screen share).

I can now screen share from other Macs, Time Machine works, pings are going through at jumbo frame sizes, and can still connected to 100Mbps devices (Sonos, printer, etc.).
 
southerndoc said:
Was able to get it working after I routed everything through the switch in my basement. Basically the router has LAN1 connected to the LGS318P switch and LAN2-4 empty.

Set the MTU's to 9000 manually (previously this wouldn't work; caused Time Machine to fail when backing up to my Synology DiskStation and wouldn't allow other Macs to screen share).

I can now screen share from other Macs, Time Machine works, pings are going through at jumbo frame sizes, and can still connected to 100Mbps devices (Sonos, printer, etc.).
Click to expand...

Good to hear, but is it faster ?
 
southerndoc said:
Seems so, but it's unstable. After about 24 hours my iMac has trouble finding the DiskStation. I've gone back to 1500.
Click to expand...

Yes, I had this sort of behaviour also, so I stopped using them. I put it down to having a mixed network. Other forums have mentioned the same.
 
mfram said:
You won't be able to talk to other machines on the Internet over the jumbo frame interface if the MTU is actually turned up.
Click to expand...

Jumbo frames doesn't have anything to do with the Internet. Computers are able to access the Internet just fine with jumbo frames enabled.
 
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