Re: [Xen-users] MTU-1492 Permenent Setting for Xen Specific Interfaces

[Erik <erik@xxxxxxxxxxx>]

Steven,

Why would you want to change the MTU, som applications won't like a non 
standard (<1500) MTU, we use a MTU of 1504 on our 802.1q interface (an e1000)
in Dom0 to bridge vlan interfaces to domU and preserve a 1500 byte mtu, mtu 
1504 should work without setting it as the kernel support 802.1q framing
(1500 byte + 4 byte vlan tag).

Erik


Steven Anderson wrote:
> Been investigating perminetly changing the MTU size in the setup scripts.
> 
> This is what I have tried but failed to get it to make changes
> 
> added wherever #added appears (note did not use "#added" in the actual
> scripts)
> 
> 
> The vif-route script in /etc/xen/scripts contains
> __________________________________________________
> dir=$(dirname "$0")
> . "$dir/vif-common.sh"
> 
> main_ip=$(dom0_ip)
> 
> case "$command" in
>     online)
>         ifconfig ${vif} ${main_ip} netmask 255.255.255.255 up
>   #added          if [[ "${vif}" == "peth0" ]] ; then
>    #added         else
>     #added         ifconfig ${vif} mtu 1492
>      #added        fi
>         echo 1 >/proc/sys/net/ipv4/conf/${vif}/proxy_arp
>         ipcmd='a'
>         ;;
>     offline)
>         ifdown ${vif}
>         ipcmd='d'
>         ;;
> ___________________________________________________
> 
> I tried adding the lines above but it had no effect on the interface. I
> guess i dont understand when this scipt is run or some other fundamental
> components....I'm no programmer. Can anyone tell me why it only changes
> the eth0 interface on dom0?????
> 
> 
> 
> 
> 
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