[Tyler McAdams]

I'm trying to up the mtu's of a connection and I get an error when using the command:

ifconfig eth0 mtu 9000

Is there anything I'm doing wrong? Is there a application that will let me tweak this?

[Jellytussle]

Why not just use the Ethernet tab of the Network preferences pane to adjust your MTU?

[CatOne]

I assume your switch or network environment supports jumbo frames? If not, it will immediately negotiate back I believe.

[Tyler McAdams]

Originally Posted by CatOne

I assume your switch or network environment supports jumbo frames? If not, it will immediately negotiate back I believe.

It's a firewire connection that's only point to point (technically)

I found something that will do it:
http://www.bresink.de/osx/TinkerToolSys.html