From a6f45c69421939665b7d22754c3dd0565ef4c481 Mon Sep 17 00:00:00 2001
From: Brian Haley <bhaley@redhat.com>
Date: Fri, 6 Nov 2020 17:31:06 -0500
Subject: [PATCH] Decrease MTU to account for IPv6 header

(MTU - 50) only supports VxLAN over IPv4, decrease it
to support IPv6 as well, which is 20 bytes larger.

Change-Id: Ifa2633169afe2dd73c78ca7bbfa1a0102caffc95
---
 roles/multi-node-bridge/tasks/common.yaml | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/roles/multi-node-bridge/tasks/common.yaml b/roles/multi-node-bridge/tasks/common.yaml
index a1b56baed..a0e22cd91 100644
--- a/roles/multi-node-bridge/tasks/common.yaml
+++ b/roles/multi-node-bridge/tasks/common.yaml
@@ -121,8 +121,8 @@
                 SMALLEST_MTU=$MTU
             fi
         done
-        # 50 byte overhead for vxlan
-        echo $(( SMALLEST_MTU - 50 ))
+        # 70 byte overhead for vxlan + IPv6, which will also support IPv4
+        echo $(( SMALLEST_MTU - 70 ))
       args:
         executable: /bin/bash
       environment: