doc: add note on McastSndSocketBuffer and McastRcvSocketBuffer

This patch adds a note on the impact of having small values for
the McastSndSocketBuffer and McastRcvSocketBuffer clauses.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

3 files changed, 23 insertions, 15 deletions

diff --git a/doc/sync/alarm/conntrackd.conf b/doc/sync/alarm/conntrackd.conf
index 0d4847b..f42a799 100644
--- a/doc/sync/alarm/conntrackd.conf
+++ b/doc/sync/alarm/conntrackd.conf
@@ -80,9 +80,10 @@ Sync {
 		# sender queue. The overrun results packet loss, thus, losing
 		# state information that would have to be retransmitted. If you
 		# notice some packet loss, you may want to increase the size
-		# of the sender buffer.
+		# of the sender buffer. The default size is usually around
+		# ~100 KBytes which is fairly small for busy firewalls.
 		#
-		# McastSndSocketBuffer 1249280
+		McastSndSocketBuffer 1249280
 
 		# The multicast receiver uses a buffer to enqueue the packets
 		# that the socket is pending to handle. The default size of this
@@ -91,9 +92,10 @@ Sync {
 		# receiver queue. The overrun results packet loss, thus, losing
 		# state information that would have to be retransmitted. If you
 		# notice some packet loss, you may want to increase the size of
-		# the receiver buffer.
+		# the receiver buffer. The default size is usually around
+		# ~100 KBytes which is fairly small for busy firewalls.
 		#
-		# McastRcvSocketBuffer 1249280
+		McastRcvSocketBuffer 1249280
 
 		# 
 		# Enable/Disable message checksumming. This is a good
diff --git a/doc/sync/ftfw/conntrackd.conf b/doc/sync/ftfw/conntrackd.conf
index 047ea48..e12a745 100644
--- a/doc/sync/ftfw/conntrackd.conf
+++ b/doc/sync/ftfw/conntrackd.conf
@@ -88,10 +88,11 @@ Sync {
 		# sender queue. The overrun results packet loss, thus, losing
 		# state information that would have to be retransmitted. If you
 		# notice some packet loss, you may want to increase the size
-		# of the sender buffer.
-		#
-		# McastSndSocketBuffer 1249280
+		# of the sender buffer. The default size is usually around
+		# ~100 KBytes which is fairly small for busy firewalls.
 		#
+		McastSndSocketBuffer 1249280
+
 		# The multicast receiver uses a buffer to enqueue the packets
 		# that the socket is pending to handle. The default size of this
 		# socket buffer is available at /proc/sys/net/core/rmem_default.
@@ -99,9 +100,10 @@ Sync {
 		# receiver queue. The overrun results packet loss, thus, losing
 		# state information that would have to be retransmitted. If you
 		# notice some packet loss, you may want to increase the size of
-		# the receiver buffer.
+		# the receiver buffer. The default size is usually around
+		# ~100 KBytes which is fairly small for busy firewalls.
 		#
-		# McastRcvSocketBuffer 1249280
+		McastRcvSocketBuffer 1249280
 
 		# 
 		# Enable/Disable message checksumming. This is a good
diff --git a/doc/sync/notrack/conntrackd.conf b/doc/sync/notrack/conntrackd.conf
index bc1a3a6..cbc26ee 100644
--- a/doc/sync/notrack/conntrackd.conf
+++ b/doc/sync/notrack/conntrackd.conf
@@ -66,9 +66,11 @@ Sync {
 		# sender queue. The overrun results packet loss, thus, losing
 		# state information that would have to be retransmitted. If you
 		# notice some packet loss, you may want to increase the size
-		# of the sender buffer. Note: This protocol is best effort,
-		# really recommended to increase the buffer size.
-
+		# of the sender buffer. The default size is usually around
+		# ~100 KBytes which is fairly small for busy firewalls.
+		# Note: This protocol is best effort, it is really recommended
+		# to increase the buffer size.
+		#
 		McastSndSocketBuffer 1249280
 
 		# The multicast receiver uses a buffer to enqueue the packets
@@ -78,9 +80,11 @@ Sync {
 		# receiver queue. The overrun results packet loss, thus, losing
 		# state information that would have to be retransmitted. If you
 		# notice some packet loss, you may want to increase the size of
-		# the receiver buffer. Note: This protocol is best effort,
-		# really recommended to increase the buffer size.
-
+		# of the sender buffer. The default size is usually around
+		# ~100 KBytes which is fairly small for busy firewalls.
+		# Note: This protocol is best effort, it is really recommended
+		# to increase the buffer size.
+		#
 		McastRcvSocketBuffer 1249280
 
 		#