neutron

  1. Bug #1542503
  2. Comment #3

Comment 3 for bug 1542503

Revision history for this message
Matt Kassawara (ionosphere80) wrote : Re: Lacking mechanism to provide proper MTU to instances

Until we can sufficiently test routing between provider and private networks, we can at least implement the following:

1) Configure the 'global_physnet_mtu' option in neutron.conf to indicate the MTU of the underlying physical network.
2) For provider networks, populate the 'mtu' network parameter with the value of 'global_physnet_mtu' because these networks do not use an overlay protocol that adds overhead. Provide this MTU value to instances via DHCP or RA.
3) For private networks, subtract the overlay protocol overhead from the value of 'global_physnet_mtu' and populate the 'mtu' network parameter with this value. Provide this MTU value to instances via DHCP or RA.