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Re: Changing MTU for pxeboot



Ray Van Dolson a écrit :
On Fri, May 11, 2007 at 06:38:22PM +0200, Olivier BONHOMME wrote:
Hello everybody,

I am trying to install a Fedora Core 6 using pxeboot. The problem is that the server which contains the install images has a MTU set to 9000. Then when I try to download the install image on the system which I try to install, the transfer fails because I have a MTU 9000 on a side and a MTU 1500 on the other side.

I saw on the Redhat bugzilla, that it was possible to send a new MTU parameter to /sbin/loader and anaconda using the command line. I tried to put mtu=9000 on my pxelinux.cfg file but it doesn't seem to work.

Does somebody has this problem and does somebody know how to change the MTU parameter on /sbin/loader and anaconda in a automatically way ?

Thank you for your answers

Your card probably doesn't support an MTU size of 9000?
It is a broadcom NetExtreme II managed by the bnx2 driver. This card support the MTU 9000. The problem is that when anaconda is started, it is impossible for me to change the MTU in a manual way or automatical way. That's what I would want to do.
Is there an intermediary firewall that might be blocking the ICMP
fragmentation packets that should help with the MTU size?
There is only a manageable switch without any filtering rules
Does anaconda let you set the MSS (maximum segment size)?
That's what I am looking for.
Can you run a tcpdump when the stalls occur to see if your machine is
sending back ICMP packet too large packets?

I am going to check that.

Best regards,
Olivier BONHOMME


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