Re: [libvirt-users] OVS / KVM / libvirt / MTU

On Thu, 8 Aug 2019 at 10:08, Sven Vogel <S.Vogel(a)ewerk.com&gt; wrote: Because otherwise some frames won't get through because the interface can't receive them, and the job of network equipment is to enable and maintain communication :-). - Peter [...] > Am 31.07.2019 um 15:50 schrieb Alvin Starr <alvin(a)netvel.net&gt;: > In general if no MTU is set on interface creation the default value is > 1500. > On OVS the bridge MTU is automatically set to the smallest port MTU. So > you just have to set the MTU of each port of the bridge. > Take a look at: https://bugzilla.redhat.com/show_bug.cgi?id=1160897 > It is a bit of a pain to read but seems to confirm the statement about the > OVS MTU value being set by the MTU of the ports. > I have been using OVS with Xen and a few years ago I had to wrap my head > around this problem. > Once you start setting the MTU to something other than 1500 you will find > you need to set ALL the MTU values of ALL your interfaces. > Otherwise some inherited default will bite you.