From: Etienne Dechamps <etienne@edechamps.fr>
Date: Sun, 15 Mar 2015 18:01:03 +0000 (+0000)
Subject: Increase the ReplayWindow default from 16 to 32.
X-Git-Tag: release-1.1pre12~185^2
X-Git-Url: https://tinc-vpn.org/git/browse?p=tinc;a=commitdiff_plain;h=7027bba541eca3e34f689bebd6f6e408ba4e7710

Increase the ReplayWindow default from 16 to 32.

As a rule, it seems reasonable to make sure that tinc operates correctly
on at least 1G links, since these are pretty common. However, I have
observed replay window issues when operating at speeds of 600 Mbit/s and
above, especially when the receiving end is a Windows system (not sure
why). This commit increases the default so that this won't occur on
fresh setups.
---

diff --git a/doc/tinc.conf.5.in b/doc/tinc.conf.5.in
index 2ba10124..9e5c0256 100644
--- a/doc/tinc.conf.5.in
+++ b/doc/tinc.conf.5.in
@@ -464,10 +464,10 @@ and
 .Ev REMOTEPORT
 are available.
 .El
-.It Va ReplayWindow Li = Ar bytes Pq 16
+.It Va ReplayWindow Li = Ar bytes Pq 32
 This is the size of the replay tracking window for each remote node, in bytes.
 The window is a bitfield which tracks 1 packet per bit, so for example
-the default setting of 16 will track up to 128 packets in the window. In high
+the default setting of 32 will track up to 256 packets in the window. In high
 bandwidth scenarios, setting this to a higher value can reduce packet loss from
 the interaction of replay tracking with underlying real packet loss and/or
 reordering. Setting this to zero will disable replay tracking completely and
diff --git a/doc/tinc.texi b/doc/tinc.texi
index 3694d6da..55560f4a 100644
--- a/doc/tinc.texi
+++ b/doc/tinc.texi
@@ -1207,10 +1207,10 @@ The environment variables @env{NAME}, @env{NODE}, @env{REMOTEADDRES} and @env{RE
 @end table
 
 @cindex ReplayWindow
-@item ReplayWindow = <bytes> (16)
+@item ReplayWindow = <bytes> (32)
 This is the size of the replay tracking window for each remote node, in bytes.
 The window is a bitfield which tracks 1 packet per bit, so for example
-the default setting of 16 will track up to 128 packets in the window. In high
+the default setting of 32 will track up to 256 packets in the window. In high
 bandwidth scenarios, setting this to a higher value can reduce packet loss from
 the interaction of replay tracking with underlying real packet loss and/or
 reordering. Setting this to zero will disable replay tracking completely and
diff --git a/src/net_packet.c b/src/net_packet.c
index 8dba3258..b05dd16f 100644
--- a/src/net_packet.c
+++ b/src/net_packet.c
@@ -64,7 +64,7 @@ static char lzo_wrkmem[LZO1X_999_MEM_COMPRESS > LZO1X_1_MEM_COMPRESS ? LZO1X_999
 
 static void send_udppacket(node_t *, vpn_packet_t *);
 
-unsigned replaywin = 16;
+unsigned replaywin = 32;
 bool localdiscovery = true;
 bool udp_discovery = true;
 int udp_discovery_keepalive_interval = 10;