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Example: Configuring Firewall Filter System Logging

Create a filter that logs and counts ICMP packets that have 192.168.207.222 as either their source or destination:



[edit]
firewall {


family inet {


filter icmp-syslog {


term icmp-match {


from {


address {
192.168.207.222/32;
}


protocol icmp;
}




then {
count packets;
syslog;
accept;
}


}




term default {
then accept;
}


}


}


}

Enter the show log filter command to display the results:

root@hostname> show log filter

Mar 20 08:03:11 hostname feb FW: so-0/1/0.0   A icmp 192.168.207.222

192.168.207.223      0     0 (1 packets)

This output file contains the following fields:

Date and Time—Date and time at which the packet was received (not shown in the default).
Filter action:
- A—Accept (or next term)
- D—Discard
- R—Reject
Protocol—Packet’s protocol name or number.
Source address—Source IP address in the packet.
Destination address—Destination IP address in the packet.

Note: If the protocol is ICMP, the ICMP type and code are displayed. For all other protocols, the source and destination ports are displayed.

The last two fields (both zero) are the source and destination TCP/UDP ports, respectively, and are shown for TCP or UDP packets only. This log message indicates that only one packet for this match has been detected in about a one-second interval. If packets arrive faster, the system log function compresses the information so that less output is generated, and displays an output similar to the following:

root@hostname> show log filter

Mar 20 08:08:45 hostname feb FW: so-0/1/0.0   A icmp 192.168.207.222

192.168.207.223     0     0 (515 packets)

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