Public bug reported:
There is an option to configure mtu for interfaces created by L3 agent, however
when setting up jumbo frames on instances, there could be a problem with
outbound packets going from the subnet with jumbos to router interface on the
subnet.
Depending on the OVS version such packets could be damaged/dropped which
effectively prevents VMs from having external connectivity.
The issue is not in IP packet fragmentation on the gateway interface,
but rather with OVS handling jumbos on qr- interface.
We need to allow setting MTU for qr- interface, while preserving MTU on
qg-
** Affects: neutron
Importance: Undecided
Assignee: Eugene Nikanorov (enikanorov)
Status: New
** Tags: l3-ipam-dhcp
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https://bugs.launchpad.net/bugs/1456399
Title:
Add config option that allows separate configuration of router and
gateway interfaces
Status in OpenStack Neutron (virtual network service):
New
Bug description:
There is an option to configure mtu for interfaces created by L3 agent,
however when setting up jumbo frames on instances, there could be a problem
with outbound packets going from the subnet with jumbos to router interface on
the subnet.
Depending on the OVS version such packets could be damaged/dropped which
effectively prevents VMs from having external connectivity.
The issue is not in IP packet fragmentation on the gateway interface,
but rather with OVS handling jumbos on qr- interface.
We need to allow setting MTU for qr- interface, while preserving MTU
on qg-
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