From d038a5295d3706a2da54f8f08c92f3b73770c594 Mon Sep 17 00:00:00 2001
From: David Anderson <danderson@tailscale.com>
Date: Mon, 22 Feb 2021 21:57:51 -0800
Subject: [PATCH] wgengine/wglog: drop 1/s "interface is up" messages.

Fixes #1388.

Signed-off-by: David Anderson <danderson@tailscale.com>
---
 wgengine/wglog/wglog.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/wgengine/wglog/wglog.go b/wgengine/wglog/wglog.go
index ed3827b4e..a0df94a75 100644
--- a/wgengine/wglog/wglog.go
+++ b/wgengine/wglog/wglog.go
@@ -40,6 +40,11 @@ func NewLogger(logf logger.Logf) *Logger {
 			// Drop. See https://github.com/tailscale/tailscale/issues/1239.
 			return
 		}
+		if strings.Contains(msg, "Interface up requested") || strings.Contains(msg, "Interface down requested") {
+			// Drop. Logs 1/s constantly while the tun device is open.
+			// See https://github.com/tailscale/tailscale/issues/1388.
+			return
+		}
 		r := ret.replacer.Load()
 		if r == nil {
 			// No replacements specified; log as originally planned.