Reviewed: https://review.opendev.org/c/openstack/neutron/+/937026
Committed:
https://opendev.org/openstack/neutron/commit/d080b35782c705b105da61af3949d67832efd2c8
Submitter: "Zuul (22348)"
Branch: master
commit d080b35782c705b105da61af3949d67832efd2c8
Author: Rodolfo Alonso Hernandez <ralon...@redhat.com>
Date: Wed Dec 4 14:02:02 2024 +0000
[OVN] Set always the GW LRP "gateway_mtu" option
If the configuration option "ovn.ovn_emit_need_to_frag" is set, write
always the "LSP.options.gateway_mtu" value, using the minimum MTU
value of all networks connected to the router. That will limit the
N/S traffic MTU regardless if the gateway network MTU is greater or
less than the internal network MTU.
Closes-Bug: #2032817
Change-Id: Ia1f0c0955d2fd90c7ff6307b1bc9819721ee2f9b
** Changed in: neutron
Status: In Progress => Fix Released
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https://bugs.launchpad.net/bugs/2032817
Title:
[OVN] packet drops when provider network MTU exceeds tenant network
MTU
Status in neutron:
Fix Released
Bug description:
At the moment, we have a provider network running 1500 MTU and then
some tenant networks running 1450 MTU.
We've noticed that southbound traffic from the provider network to the
tenant network will result in packets being dropped since the MTU is
smaller.
So, the VM would not be able to get any traffic if the packet size >
1450, since the provider network operates at 1500 and hands over 1500
packets to the tap interface which gets dropped by the kernel:
[Wed Aug 23 14:33:19 2023] tapdf9341b0-6d: dropped over-mtu packet: 1456 >
1450
...
It seems that OVN should fragment packets when it notices the MTU of
the target NAT is smaller than it's own, otherwise traffic goes into a
nowhere.
OVN: 23.03.0
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