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List:       openvswitch-discuss
Subject:    [ovs-discuss] encapsulation and MTUs (was: Re: Path MTU Discovery)
From:       dmagda () ee ! ryerson ! ca (David Magda)
Date:       2014-01-31 19:20:47
Message-ID: c00284547cbad3da3ce4b00706206563.squirrel () webmail ! ee ! ryerson ! ca
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On Thu, January 30, 2014 15:45, Jesse Gross wrote:
>> A particular detail: on which host (i.e, non-VM) interfaces does one
>> change the MTU for OpenStack? For example, on OS compute nodes, there is
>> the actual NIC (eth0), but also br-int and br-tun (where the GRE tunnels
>> connect to):
>
> You should change the MTU on all interfaces: the Ethernet interface is
> a must and bridges should have the same MTU on all ports.

So that includes all of these br-*?

root at osnet1:/# ifconfig
br-ex     Link encap:Ethernet  HWaddr aa:bb:0b:bc:09:cd
          inet addr:10.0.20.77  Bcast:10.0.20.255  Mask:255.255.255.0
          UP BROADCAST RUNNING  MTU:1546  Metric:1

br-int    Link encap:Ethernet  HWaddr 32:95:87:9b:2b:49
          UP BROADCAST RUNNING  MTU:1500  Metric:1

br-tun    Link encap:Ethernet  HWaddr ae:ab:60:d2:75:4c
          UP BROADCAST RUNNING  MTU:1546  Metric:1

eth0      Link encap:Ethernet  HWaddr aa:bb:0b:bc:09:cd
          UP BROADCAST RUNNING MULTICAST  MTU:1546  Metric:1

As well as on the compute nodes?

dmagda at oscn1:~$ ifconfig
br-int    Link encap:Ethernet  HWaddr 42:36:74:c4:a4:40
          UP BROADCAST RUNNING  MTU:1500  Metric:1

br-tun    Link encap:Ethernet  HWaddr 2e:d6:b1:bb:c5:40
          UP BROADCAST RUNNING  MTU:1546  Metric:1

eth0      Link encap:Ethernet  HWaddr aa:bb:7d:63:55:aa
          inet addr:10.0.20.76  Bcast:10.0.20.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1546  Metric:1

Regards,
David



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