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pcap_latency_analyzer capture.pcap -mac-diff -mac-diff-a 00:11:22:33:44:55 -mac-diff-b 66:77:88:99:aa:bb -latency-histo OutputĮxample output of packet latency analysis Generate latency profile of the same packet from 2 different MACs.pcap_latency_analyzer capture.pcap -tcp-only -packet-trace -tcp-length 200 Trace the same packets within a single PCAP of a specific packet length.pcap_latency_analyzer capture.pcap -tcp-only -packet-trace Trace the same packets within a single PCAP.pcap_latency_analyzer captureA.pcap captureB.pcap -latency-histo -latency-histo-unit 100 -file-diff -full-packet-tcp-only The following searches for each packet in both files and reports the time difference between the 2 files. There are 2 10g packet capture devices, capturing the same lines (e.g. ts-last-byte-b | adjust timestamp of first file B from last byte to first byte (assumes 10G) ts-last-byte-a | adjust timestamp of first file A from last byte to first byte (assumes 10G) latency-histo-unit | duration of a single histogram slot. latency-histo-max | maximum time delta for histogram. latency-histo-min | minimum time delta for histogram.
#Cocoa packet analyzer pcap activate fail mac#
file-diff-latency-trace | trace packets that have latency greather than ĭiff 2 MAC address: -mac-diff | compare packets from 2 mac address in a single PCAP
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file-diff-missing-trace | trace all packets that are missing file-diff-nofcs-b | file B has no FCS (ethernet crc) value file-diff-nofcs-a | file A has no FCS (ethernet crc) value file-diff-strict | only matches with two entries in a hash node will be sampled file-diff-no-timesync | do not attempt to time sync the two files. file-diff | special mode of comparing packets between 2 files (instead of within the same file)
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full-packet-udp-only | use entire packet contents for hash but only for udp packetsĭiff 2 PCAP files: -file-diff | special mode of comparing packets between 2 files (instead of within the same file) full-packet-tcp-only | use entire packet contents for hash but only for tcp packets full-packet | use entire packet contents for hash (.e.g no protocol) udp-length-chomp | remove bytes from the end of the UDP packet udp-length | specifiy udp packets of only length tcp-length | filter tcp packets to include only payload length of packet-max | maximum number of packets to process packet-time-delta-max | reset time between new and old packets with the same hash. disable-mmap | use fread not mmap of the pcap files hash-memory | (int MB) amount of memory to use for hashing. length-histo | print packet length histogram packet-trace | write each packet events to stdout This is done because of the low entropy level of small say 64B packets which generates many false positives. In addition to 128b DEK hash the match also checks the first 16B of the packet which includes the MAC header + first few bytes of the next layer. When a packet`s hash matches an existing entry in the table it appends the packet for further analysis. It works by generating a 128b DEK hash of the entire packet (-full-packet) or just the payload (TCP payload / UDP payload) which gets stored into a large hash table. Using this script a simple text based latency statistics and histogram can be generated. Pcap_diff is a simple packet analyzer tool used to extract time difference between the same packets in 2 different pcap files.Īn example situation is calculating the latency profile of a switch/or other network device where the same packet is recorded with a highly accurate hardware timestamped packet capture device both before the network device and after it.