From 9235fcd97d0439945a61b5fb877dbd83405ba399 Mon Sep 17 00:00:00 2001 From: Clark Boylan Date: Tue, 26 Jun 2018 10:31:52 -0700 Subject: [PATCH] Add note about test env MTU variance 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 --- doc/source/testing.rst | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/doc/source/testing.rst b/doc/source/testing.rst index 9f73174..16b8679 100644 --- a/doc/source/testing.rst +++ b/doc/source/testing.rst @@ -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.