Open Stack

i dont know whether there is any openstack config file to change MTU
of integration and tunnel bridge.You can manually update in your os
network config file

i am using ubuntu servers so added this in /etc/network/interfaces
added br-tun.br-int and physical NIC with new MTU value

eg:
auto br-tun
iface br-tun inet static
address 0.0.0.0
MTU 8900


auto eth3
iface eth3 inet static
address 172.16.10.3
netmask 255.255.255.0
mtu 8900

for changing MTU of linux bridge i suppose its "qbr-"  add
network_device_mtu = 8900 in nova.conf on compute nodes.

On Mon, Feb 9, 2015 at 7:05 PM, Danny Choi (dannchoi)
<dannchoi at cisco.com> wrote:
> Hello,
>
> Can you tell me exactly how to change the br-tun and br-int in its config
> file?
> Which file and where?
>
> I’m using OVS which by default also has the Linux bridge.  How to take care
> of it?
>
> Thanks,
> Danny
>
>
> -------------------------------------------
> Date: Mon, 9 Feb 2015 15:01:57 +0530
> From: mad Engineer <themadengin33r at gmail.com>
> To: Eren T?rkay <erent at skyatlas.com>
> Cc: "openstack at lists.openstack.org" <openstack at lists.openstack.org>
> Subject: Re: [Openstack] higher MTU for all interfaces
> Message-ID:
> <CAN8oO4A_XcGM86_KxEySKOa_wOf1ZQwwOSMgmhtdKLtjFtF6vw at mail.gmail.com>
> Content-Type: text/plain; charset=UTF-8
>
> thanks,i manually changed br-tun br-int in its network config file and
> now its working across reboot.
>
>
> On Mon, Feb 9, 2015 at 12:42 PM, Eren T?rkay <erent at skyatlas.com> wrote:
>
> On 08-02-2015 21:56, mad Engineer wrote:
>
> Hello all is there any way we can change MTU of all relevant
> interfaces of instances,if i set
> dhcp-option-force=26,1400 will it change MTU of all relevant
> interfaces like qbr qvo br-int etc etc
> is there any way to change MTU of all neutron interfaces.
>
>
> Hello,
>
> There is an option "network_device_mtu" on nova.conf. When tap,qvo,qbr
> bridges
> are setup, it will use this setting to set MTU. However, from my experience,
> there is no setting to set br-tun, br-int MTU setting.
>
> I need to note that DHCP option will only cause MTU setting inside VMs.
>
> You can follow the bug report about setting MTUs on br-int, br-tun
> interfaces.
>
> https://bugs.launchpad.net/neutron/+bug/1419069
>
> Regards,
> Eren
>
> --
> System Administrator
> https://skyatlas.com/
>
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>