Seems like no luck here.
Any other ideas? 
Running ver 4.11

[[email protected] 25515] /interface ethernet> :put [get [find 
name=ether1] l2mtu ]

[[email protected] 25515] /interface ethernet> :put [get [find 
name=ether1] mtu ]  
1500
[[email protected] 25515] /interface ethernet> :put [get [find 
name=ether1] l2mtu ]

[[email protected] 25515] /interface ethernet> /sys resource pci pr
 # DEVICE   VENDOR                                       NAME            
                          IRQ       
 0 07:00.0  Intel Corporation                            82573L Gigabit 
Ethernet Controller (re... 5         
 1 06:00.0  Intel Corporation                            82573L Gigabit 
Ethernet Controller (re... 7         
 2 05:00.0  Intel Corporation                            82573L Gigabit 
Ethernet Controller (re... 11        
 3 04:00.0  Intel Corporation                            82573L Gigabit 
Ethernet Controller (re... 10        
 4 03:00.0  Intel Corporation                            82573L Gigabit 
Ethernet Controller (re... 5         
 5 02:00.0  Intel Corporation                            82573L Gigabit 
Ethernet Controller (re... 7         
 6 01:00.0  Intel Corporation                            82573L Gigabit 
Ethernet Controller (re... 7         
 7 00:1f.3  Intel Corporation                            82801G (ICH7 
Family) SMBus Controller ... 11        
 8 00:1f.2  Intel Corporation                            82801GB/GR/GH 
(ICH7 Family) SATA IDE C... 0         
 9 00:1f.0  Intel Corporation                            82801GB/GR 
(ICH7 Family) LPC Interface... 0         
10 00:1e.0  Intel Corporation                            82801 PCI 
Bridge (rev: 225)               0         
11 00:1d.7  Intel Corporation                            82801G (ICH7 
Family) USB2 EHCI Control... 11        
12 00:1d.3  Intel Corporation                            82801G (ICH7 
Family) USB UHCI Controll... 7         
13 00:1d.2  Intel Corporation                            82801G (ICH7 
Family) USB UHCI Controll... 10        
14 00:1d.1  Intel Corporation                            82801G (ICH7 
Family) USB UHCI Controll... 11        
15 00:1d.0  Intel Corporation                            82801G (ICH7 
Family) USB UHCI Controll... 11        
16 00:1c.5  Intel Corporation                            82801GR/GH/GHM 
(ICH7 Family) PCI Expre... 5         
17 00:1c.4  Intel Corporation                            82801GR/GH/GHM 
(ICH7 Family) PCI Expre... 7         
18 00:1c.3  Intel Corporation                            82801G (ICH7 
Family) PCI Express Port ... 11        
19 00:1c.2  Intel Corporation                            82801G (ICH7 
Family) PCI Express Port ... 10        
20 00:1c.1  Intel Corporation                            82801G (ICH7 
Family) PCI Express Port ... 5         
21 00:1c.0  Intel Corporation                            82801G (ICH7 
Family) PCI Express Port ... 7         
22 00:02.0  Intel Corporation                            82945G/GZ 
Integrated Graphics Controll... 7         
23 00:01.0  Intel Corporation                            82945G/GZ/P/PL 
PCI Express Root Port (... 7         
24 00:00.0  Intel Corporation                            82945G/GZ/P/PL 
Memory Controller Hub (... 0         

[[email protected] 25515] /interface ethernet>

-----Original Message-----
From: Blake Covarrubias [mailto:[email protected]] 
Sent: Sunday, October 17, 2010 6:36 AM
To: Mikrotik discussions
Subject: Re: [Mikrotik] MTU Question

All x86 NICs should have the L2MTU field as well.

/interface
:put [get [find name="ether1"] l2mtu]

Set the MTU to the L2MTU if you want to run IP frames at the highest 
supported interface value.

/interface ethernet
set [find name="ether1"] mtu=[get [find name="ether1"] l2mtu]

--
Blake Covarrubias

On Oct 16, 2010, at 19:12, Keith Barber <[email protected]> wrote:

> Good evening,
> 
> We are using primarily MicroNocs and Powerouters on our network.  Aka 
x86 boards running intel GigE chips.
> We are noticing that MTU keeps cropping up as a problem for us when 
implementing EoIP.
> 
> Routerboards now have the L2MTU field.  For these x86 based rigs, how 
do you tell it to essentially "enable jumbo frame" ?
> 
> 1 post I found said to actually set the IP Ethernet MTU higher than 
1500, but wouldn't that lead to other problems?
> 
> I'm hoping there's a solution, and hopefully one that doesn't involve 
installed RB44G's in each device.
> 
> Thanks in advance.
> 
> -Keith-
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