+
+You probably want to start with the recv-*.summary files. Here's an
+example line (folded and indented here to make it easier to read:
+
+-7 80.4.4.56 > 212.22.195.1: 6.115.30.33.50 > 158.55.15.27.50: \
+ udp 37 (DF) [tos 0xaf] (ttl 255, id 55590) [tos 0x62] (ttl ###, id 21803)
+
+This means that packet no.7 either the packet didn't arrive, or
+tcpdump produced different a summary line for the second packet.
+
+The recv-*.summary and recv-*.mdiff files DO NOT contain information
+about packets whose bodies changed, unless tcpdump reported the change
+in its summary. recv-*.diff contains ALL changes, even to meaningless
+parts of packets, except changes to the IP TTL and IP header checksum
+(which are expected to change).
+
+So, you can then look in recv-1.mdiff and recv-1.diff for more
+information about packet no.7, if you're interested. See below for
+help on interpreting the diffs.
+
+