Yeah, I changed the MTU to 9000 on the Guest network interface and connectivity is now fine out of the box. Hopefully I won't need to set jumbo frames in the VMs any time soon. :-)
Thanks for the tips. Lucian -- Sent from the Delta quadrant using Borg technology! Nux! www.nux.ro ----- Original Message ----- > From: "Simon Weller" <swel...@ena.com.INVALID> > To: "users" <users@cloudstack.apache.org> > Cc: "dev" <d...@cloudstack.apache.org> > Sent: Monday, 20 November, 2017 17:36:31 > Subject: Re: Circumventing VXLAN MTU issues > Change your host interface MTU to something a lot higher. > > > ________________________________ > From: Nux! <n...@li.nux.ro> > Sent: Monday, November 20, 2017 10:51 AM > To: users > Cc: dev > Subject: Re: Circumventing VXLAN MTU issues > > Hi, > > I probably can use jumbo frames, but for now my lab is restricted to a single > machine. > Anything I can do in this situation? > > -- > Sent from the Delta quadrant using Borg technology! > > Nux! > www.nux.ro > > ----- Original Message ----- >> From: "Simon Weller" <swel...@ena.com.INVALID> >> To: "dev" <d...@cloudstack.apache.org>, "users" <users@cloudstack.apache.org> >> Sent: Monday, 20 November, 2017 16:38:33 >> Subject: Re: Circumventing VXLAN MTU issues > >> Lucian, >> >> Can you run jumbos on your switches? >> >> - Si >> >> >> ________________________________ >> From: Nux! <n...@li.nux.ro> >> Sent: Monday, November 20, 2017 10:08 AM >> To: dev >> Cc: users >> Subject: Circumventing VXLAN MTU issues >> >> Hello, >> >> I am playing around with the native VXLAN implementation and I have of course >> hit the situation where MTU on the host gets chomped by 50 bytes and traffic >> crawls to a stop in the VMs. >> How are you people circumventing this? The easiest, but kind of inconvenient >> for >> customers would be to set MTU 1450 inside the VM, though it could be baked >> into >> the templates or via cloud-init. >> >> Is the OpenVSwitch implementation (of VXLAN) suffer from the same problem, I >> understand ovs can dynamically adjust MTUs to compensate (?), but at the same >> time this VXLAN implementation suffers from some limitations (multicast etc). >> >> Lucian >> >> >> -- >> Sent from the Delta quadrant using Borg technology! >> >> Nux! > > www.nux.ro
