From fcc30b0d4dc8b6c7ccba3f40d5b54d27a94e5b1c Mon Sep 17 00:00:00 2001
From: sthen <>
Date: Thu, 31 May 2012 15:04:03 +0000
Subject: [PATCH] Add commented-out examples for net.inet.tcp.always_keepalive
 / keepidle. These are useful if you're behind a bad nat with short timeouts
 as often found in airport lounges and hotels. If the keepalives fail because
 the network goes away (moving out of wireless reception, swapping cables etc)
 your connections are more likely to drop so this is a double-edged sword.

ok henning@
---
 src/etc/sysctl.conf | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/etc/sysctl.conf b/src/etc/sysctl.conf
index 4650854b..fdf18bc1 100644
--- a/src/etc/sysctl.conf
+++ b/src/etc/sysctl.conf
@@ -1,4 +1,4 @@
-#	$OpenBSD: sysctl.conf,v 1.52 2011/06/24 19:47:48 naddy Exp $
+#	$OpenBSD: sysctl.conf,v 1.53 2012/05/31 15:04:03 sthen Exp $
 #
 # This file contains a list of sysctl options the user wants set at
 # boot time.  See sysctl(3) and sysctl(8) for more information on
@@ -13,6 +13,8 @@
 #net.inet6.ip6.mforwarding=1	# 1=Permit forwarding (routing) of IPv6 multicast packets
 #net.inet6.ip6.multipath=1	# 1=Enable IPv6 multipath routing
 #net.inet6.ip6.accept_rtadv=1	# 1=Permit IPv6 autoconf (forwarding must be 0)
+#net.inet.tcp.always_keepalive=1 # 1=Keepalives for all connections (e.g. hotel/airport NAT)
+#net.inet.tcp.keepidle=100	# 100=send TCP keepalives every 50 seconds
 #net.inet.tcp.rfc1323=0		# 0=Disable TCP RFC1323 extensions (for if tcp is slow)
 #net.inet.tcp.rfc3390=0		# 0=Disable RFC3390 for TCP window increasing
 #net.inet.esp.enable=0		# 0=Disable the ESP IPsec protocol