openstack/ironic
Code Issues Proposed changes

Try limiting MTU to at least 1280

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Change-Id: If8f9907df62019b3cf6d6df7d83d5ff421f6be65
(cherry picked from commit 510f87a033)
This commit is contained in:
Dmitry Tantsur
2024-09-11 17:37:24 +02:00
committed by Jay Faulkner
parent d0fb7bce54
commit 676d4b2ebf
1 changed files with 7 additions and 4 deletions
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11
devstack/settings
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@@ -8,9 +8,12 @@ source $DEST/ironic/devstack/common_settings
# Get the smallest local MTU
local_mtu=$(ip link show | sed -ne 's/.*mtu \([0-9]\+\).*/\1/p' | sort -n | head -1)
# 50 bytes is overhead for vxlan (which is greater than GRE
# allowing us to use either overlay option with this MTU.
# allowing us to use either overlay option with this MTU).
# However, if traffic is flowing over IPv6 tunnels, then
# The overhead is essentially another 100 bytes. In order to
# The overhead is essentially another 78 bytes. In order to
# handle both cases, lets go ahead and drop the maximum by
# 100 bytes.
PUBLIC_BRIDGE_MTU=${OVERRIDE_PUBLIC_BRIDGE_MTU:-$((local_mtu - 100))}
# 78 bytes, while not going below 1280 to make IPv6 work at all.
PUBLIC_BRIDGE_MTU=${OVERRIDE_PUBLIC_BRIDGE_MTU:-$((local_mtu - 78))}
if [ $PUBLIC_BRIDGE_MTU -lt 1280 ]; then
PUBLIC_BRIDGE_MTU=1280
fi