Jumbo Frames - eSATA Sheeva Multi

[JustaGuy]

Can I add this line to /etc/network/interfaces?

pre-up ifconfig eth0 mtu=9000


I'm hesitant to do so because in the past I've become locked out of a box for setting this when it's not supported by the hardware, so I'd like to know the official position on this before I go ahead with it.

[NewIT_Marcus]

I just tried it on a (debian lenny) SD card, with this consequence in my bootlog:

Code:

Setting up networking....
Configuring network interfaces...mtu=9000: Host name lookup failure
ifconfig: `--help' gives usage information.
Failed to bring up eth0.

[DaveH]

If you take out the '=' and use

pre-up ifconfig eth0 mtu 9000

then it takes it just fine.

Code:

debian:~# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:50:43:01:49:7a  
          inet addr:192.168.144.253  Bcast:192.168.144.255  Mask:255.255.255.0
          inet6 addr: fe80::250:43ff:fe01:497a/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:9000  Metric:1
          RX packets:64 errors:0 dropped:0 overruns:0 frame:0
          TX packets:105 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:10208 (9.9 KiB)  TX bytes:81902 (79.9 KiB)
          Interrupt:11

I can connect to it via the interface so it isn't completely broken even if it might not do what you want.

I should point out that mine was on a standard plug, no eSATA.

[JustaGuy]

Thanks, guys.

That '=' was my error, I typed what I thought I remembered from the config, which indeed does not include it.

I do have some concern nibbling in the back of my mind about not having verified the hardware indeed is the same, but I can use the serial USB access to change it back if need be.

I forgot about USB serial, or I wouldn't have been worried enough to post the question in the first place.

Thanks again.