diff -r b08fe828b686 src/common/pcap-file.cc
--- a/src/common/pcap-file.cc	Wed Jun 02 11:14:06 2010 -0400
+++ b/src/common/pcap-file.cc	Wed Jun 02 13:15:24 2010 -0700
@@ -366,6 +366,7 @@
   m_file.write ((const char *)&header.m_tsUsec, sizeof(header.m_tsUsec));
   m_file.write ((const char *)&header.m_inclLen, sizeof(header.m_inclLen));
   m_file.write ((const char *)&header.m_origLen, sizeof(header.m_origLen));
+  m_file.flush();
   return inclLen;
 }
 
@@ -374,6 +375,7 @@
 {
   uint32_t inclLen = WritePacketHeader (tsSec, tsUsec, totalLen);
   m_file.write ((const char *)data, inclLen);
+  m_file.flush();
 }
 
 void 
@@ -381,6 +383,7 @@
 {
   uint32_t inclLen = WritePacketHeader (tsSec, tsUsec, p->GetSize ());
   p->CopyData (&m_file, inclLen);
+  m_file.flush();
 }
 
 void 
@@ -397,6 +400,7 @@
   headerBuffer.CopyData (&m_file, toCopy);
   inclLen -= toCopy;
   p->CopyData (&m_file, inclLen);
+  m_file.flush();
 }
 
 void