On 02/10/2015 12:12 AM, mad Engineer wrote:> 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
the ovs switch will have the same mtu as the port with the smallest mtu,
linux bridge (brctl) will do the same
$ sudo ovs-vsctl add-br hola
$ ifconfig hola
hola Link encap:Ethernet HWaddr 3a:e9:3a:a1:03:4a
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
$ sudo modprobe dummy
$ sudo ifconfig dummy0 up
yydesk:~$ ifconfig dummy0
dummy0 Link encap:Ethernet HWaddr d2:86:e9:e3:b2:62
inet6 addr: fe80::d086:e9ff:fee3:b262/64 Scope:Link
UP BROADCAST RUNNING NOARP MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:2 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 B) TX bytes:140 (140.0 B)
$ sudo ifconfig dummy0 mtu 5000
$ sudo ovs-vsctl add-port hola dummy0
$ ifconfig hola
hola Link encap:Ethernet HWaddr 3a:e9:3a:a1:03:4a
BROADCAST MULTICAST MTU:5000 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
$ ifconfig dummy0
dummy0 Link encap:Ethernet HWaddr d2:86:e9:e3:b2:62
inet6 addr: fe80::d086:e9ff:fee3:b262/64 Scope:Link
UP BROADCAST RUNNING NOARP MTU:5000 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:3 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 B) TX bytes:210 (210.0 B)
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)
<dannc...@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 <themadengin...@gmail.com>
To: Eren T?rkay <er...@skyatlas.com>
Cc: "openstack@lists.openstack.org" <openstack@lists.openstack.org>
Subject: Re: [Openstack] higher MTU for all interfaces
Message-ID:
<can8oo4a_xcgm86_kxeyskoa_wof1zqwwosmgmhtdkltjftf...@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 <er...@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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