On Fri, Jun 05, 2026 at 12:43:35PM +0200, Thomas Pries wrote: > Am 05.06.26 um 00:09 schrieb David Gwynne: > > On Thu, Jun 04, 2026 at 10:52:10AM +0200, Thomas Pries wrote: > > > ... > > > ifconfig ix0/ix1?? hwfeatures ...??hardmtu 9198 > > > ifconfig aggr0?? hwfeatures ...??hardmtu 9198 > > > ... > > OpenBSD is different to most other systems in how it handles packet > > sizes and MTU on interfaces. ... > > Thank you very much for this detailed explanation. > > My network college would be happy, if I could would set the MTU to 9180 and > I tried to set this on aggr0 and ix* via: > > ifconfig ix0 down > > ifconfig ix0 mtu 9180 > > but I always get the error: > > ifconfig: SIOCSIFMTU: Device busy > > What is the procedure to set the MTU?
As David already said: > In your set up it's the MTU of the vlan interfaces that matters, but > only to the IP stack. Everything underneath it is already set up for you > to be able to increase the MTU on the vlan interfaces. So, this should do it for you: ifconfig vlan1002 mtu 9180 ifconfig vlan689 mtu 9180 bye, Jan
