ICMPv6 Header: 0 8 16 24 ICMPv6 type (8) ICMPv6 code (8) ICMPv6 checksum (16) ICMPv6 message body (size depending on ICMPv6 type and code) UDP header: 0 8 UDP source port (16) UDP length (16) Show UUID or SUUID for every packet captured package data is written to standard out at once debugging or even more debugging set filter for expression on the command line read file with filter expressions read filter from standard input (end with ^D) limit packet data which will be read define which packets from which position in the FW-1 chain to display: I (pre-in), I (post-in), o (pre-out) and/or O (post-out) -x print raw packate data, can be limited -o write output to specified file instead of standard out -p pos insert fw monitor at a specific position in the FW-1 chain, replace x by I (pre-in), I (post-in), o (pre-out) or O (post-out) -p all insert fw monitor between all FW-1 kernel modules -a use absolute chain positions when using -p all -ci stop capture after count incoming packets -co stop capture after count outgoing packets -v capture on an specific virtual machine (only FW-1 VSX) Understanding fw monitor OutputĢ4 UDP destination port (16) UDP checksum (16)įW-1 Chain, Capture Masks And Positioningįw monitor ] Per default, the fw monitor kernel module will capture traffic at four different positions / capture points relative to the Virtual Machine within the FW-1 chain: Generate inspect and tcpdump expressions online Shell script by AREAsec for using fw monitor with tcpdump syntax Protocol Header Review (field length in bits in brackets) IP header: 0 8 16 24 ver (4) hrd len (4) type of service (8) total length (16) identification (16) flg (3) fragment offset (13) time to live (8) protocol (8) header checksum (16) source IP address (32) destination IP address (32) ICMP header: 0 8 16 24 ICMP type (8) ICMP code (8) ICMP checksum (16) ICMP message body (size depending on ICMPv6 type and code) IPv6 Header: 0 8 16 24 ver (4) traffic class (8) flow label (20) payload length (16) next header (8) source IPv6 address (128) destination IPv6 address (128)Ģ4 TCP destination port (16) sequence number (32) acknowledgement number (32) Notice: Disable SecureXL (fwaccel off) before running fw monitor. You can configure wireshark to show the packet direction by checking “Edit → Preferences → Protocols → Ethernet → Interpret as FireWall-1 monitor file” and adding an additional column via “Edit → Preferences → Columns → add Field type 'FW-1 monitor if/direction'” Notice: Any policy installation or uninstallation will cause fw monitor to exit. Capture files written with fw monitor can be read with snoop, tcpdump or ethereal/wireshark. Check Point fw monitor cheat sheet – 20141028 by Jens Roesen – email – Therefore fw monitor can capture packets on different positions of the FW-1 chain and on several interfaces at once but fw monitor won't show you any MAC addresses because it's not working on layer 2.
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