opendev/infra-manual
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Add note about test env MTU variance

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We can't rely on interface MTUs of 1500 in test envs. Some clouds give
us smaller MTUs due to overlay networking. Explain that test jobs that
create or modify networking interfaces or bridges should check for and
accomodate this.

Change-Id: Ice6c613108f3f01042ff6f4e8c88a8f0a326c815
This commit is contained in:
Clark Boylan 2018-06-26 10:31:52 -07:00
parent 6c805d4cbe
commit 9235fcd97d
1 changed files with 4 additions and 0 deletions
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doc/source/testing.rst
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@ -89,3 +89,7 @@ Known Differences to Watch Out For
* Some network protocols may be blocked in some clouds. Specfically
we have had problems with GRE. You can rely on TCP, UDP, and ICMP
being functional on all of our clouds.
* Network interface MTU of 1500 is not guaranteed. Some clouds give
us smaller MTUs due to use of overlay networking. Test jobs
should check interface MTUs and use an appropriate value for the
current instance if creating new interfaces or bridges.