Packet filter to watch ICMP (ping) packets
August 20, 1999
This packet filter will show all pings arriving at or passing through the PortMaster(TM).
This tool is useful in debugging routing problems since often a ping's echo request will arrive at the destined host but the echo reply will have trouble returning. Using this packet trace filter at different points along the path can be very revealing in pinpointing the problem.
Command> add filter p New Filter successfully added Command> set filter p 1 permit icmp Filter p updated Command> set console Setting CONSOLE to admin session Command> ptrace p ext Packet Tracing Enabled # Example ptrace output of pings arriving at PortMaster icmp from 192.168.148.1 to 10.0.0.3 type Echo Request icmp from 192.168.148.1 to 10.0.0.3 type Echo Request icmp from 192.168.148.1 to 10.0.0.3 type Echo Request # Example ptrace output of pings passing a through PortMaster icmp from 192.168.148.1 to 10.0.0.15 type Echo Request icmp from 10.0.0.15 to 192.168.148.1 type Echo Reply
To disable the ptrace, enter the following commands:
Command> ptrace Packet Tracing Disabled Command> reset console Console RESET