From bbb56f23031816f162237153ad2ca1c8e176580e Mon Sep 17 00:00:00 2001
From: Brad Fitzpatrick <bradfitz@tailscale.com>
Date: Fri, 25 Sep 2020 11:27:09 -0700
Subject: [PATCH] wgengine/router: fix tests on Debian Buster as regular user
 on machine with IPv6

---
 wgengine/router/router_linux.go | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/wgengine/router/router_linux.go b/wgengine/router/router_linux.go
index e19572187..d4c75a4ef 100644
--- a/wgengine/router/router_linux.go
+++ b/wgengine/router/router_linux.go
@@ -1003,7 +1003,9 @@ func supportsV6() bool {
 
 	// Some distros ship ip6tables separately from iptables.
 	if _, err := exec.LookPath("ip6tables"); err != nil {
-		return false
+		if _, err := os.Stat("/sbin/ip6tables"); err != nil {
+			return false
+		}
 	}
 
 	return true