Re: Re: Xen & VLANs

Hi

> What interface do you have in dom0 and what MTU is
announced by the
> vlan interfaces ?
> I've seen this "Invalid argument" error when
trying to add an interface
> whose
> MTU doesn't match the bridge's one

Hm the vlan interfaces have a 1496 Bytes MTU, the bridge has
got 1500. But how can I change the change the bridges MTU.
It doesn't work with the ifconfig comand and the man pages
says "Most devices don't support this option".

The parent interface is a normal rtk ethernet interface.

cu

Sebastian

On Thu, May 03, 2007 at 03:18:05PM +0200, Sebastian Ponitka
wrote:
> Hm the vlan interfaces have a 1496 Bytes MTU, the
bridge has got 1500.

> But how can I change the change the bridges MTU.

You can't.

> The parent interface is a normal rtk ethernet
interface.

Change its MTU to 1504 bytes and change the MTU of the VLAN
interfaces
to 1500 bytes afterwards.

	Kind regards

-- 
Matthias Scheler                                  http://zhadum.org.uk/

On Thu, May 03, 2007 at 04:10:58PM +0200, Sebastian wrote:
> Matthias Scheler schrieb:
> >> The parent interface is a normal rtk ethernet
interface.
> > 
> > Change its MTU to 1504 bytes and change the MTU of
the VLAN interfaces
> > to 1500 bytes afterwards.
> 
> But it seems that I can't change the MTU of the rtk
interface to more
> then 1500 Bytes.
> 
> "ifconfig: SIOCSIFMTU: Invalid argument"

It looks like rtk(4) devices don't support that (no big
surprise there).
I'm sorry but you have to get a decent ethernet card.

See e.g. ex(4) (using "man 4 ex"), epic(4) or
fxp(4) for 100Mb/s NICs
which support that. Or buy a Gigabit Ethernet card
preferably with an
Intel chip supported by wm(4) or a RealTek card supported by
re(4) if
you are on a really tight Budget.

	Kind regards

-- 
Matthias Scheler                                  http://zhadum.org.uk/

Matthias Scheler schrieb:
>> The parent interface is a normal rtk ethernet
interface.
> 
> Change its MTU to 1504 bytes and change the MTU of the
VLAN interfaces
> to 1500 bytes afterwards.

But it seems that I can't change the MTU of the rtk
interface to more
then 1500 Bytes.

"ifconfig: SIOCSIFMTU: Invalid argument"

Cu

Sebastian