From 65cf72e5f47449ef053c099126949431e1d4d50b Mon Sep 17 00:00:00 2001
From: rpm-build <rpm-build>
Date: Tue, 9 May 2017 10:17:42 +0200
Subject: [PATCH] Make default capture buffer size bigger.

---
 tcpdump.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/tcpdump.c b/tcpdump.c
index c7e2ebd..d0def76 100644
--- a/tcpdump.c
+++ b/tcpdump.c
@@ -130,6 +130,7 @@ The Regents of the University of California.  All rights reserved.\n";
 #endif
 
 static int Bflag;			/* buffer size */
+#define DEFAULT_CAPTURE_BUFFER_SIZE 4*1024*1024
 static int Cflag;			/* rotate dump files after this many bytes */
 static int Cflag_count;			/* Keep track of which file number we're writing */
 static int Dflag;			/* list available devices and exit */
@@ -1020,7 +1021,12 @@ open_interface(const char *device, netdissect_options *ndo, char *ebuf)
 		if (status != 0)
 			error("%s: Can't set buffer size: %s",
 			    device, pcap_statustostr(status));
-	}
+	} else {
+                Bflag = DEFAULT_CAPTURE_BUFFER_SIZE;
+		status = pcap_set_buffer_size(pc, Bflag);
+		if (status != 0)
+                        fprintf(stderr, "Can't set buffer size to %d, using system default.\n", DEFAULT_CAPTURE_BUFFER_SIZE);
+        }
 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
 	if (jflag != -1) {
 		status = pcap_set_tstamp_type(pc, jflag);
-- 
2.9.3