Top Hosts with most Connections for Cisco ASA (10021 / 20021)

Description

This Module handles Cisco ASA NSEL. It provides top N (by the number of connections) consumers (users) by Network Device by Protocol (Destination Port) over a time interval T. Cisco ASA customers may turn on NSEL at the highest reporting level, and still receive consolidated data (several syslog messages) every T seconds. This information is provided per NetFlow exporter.

Parameters

Parameter Name
Description
Comments
Data Collection Interval, sec
Module logic execution interval
min = 10 sec, max = 600 sec, default = 30 sec
Application protocol (l4_dst_port) list
List of watched layer 4 destination ports. If specified, the traffic is reported by specified ports, and all other traffic is summed up under dest_port=0. If the list is empty, the traffic is reported by all actual destination ports.
e.g. 80, 443
N – number of reported hosts
Top N (number of reported destinations)
min = 0, max = 100000, default = 50 (0 indicates all hosts are reported)
Enable(1) or disable (0) reporting by destination port
If set to 1, enable network traffic monitoring by destination port. If set to 0, report total network traffic as destination port 0 (dest_port=0)
default = 0

Inputs

Cisco ASA NSEL.

Syslog/JSON Message Fields

Key
Field Description
Comments
nfc_id
Message type identifier
“nfc_id=20021”
exp_ip
NetFlow exporter IPv4 address
<IPv4_address>
src_ip
Source host IPv4 address
<IPv4_address>
src_ip6
Source host IPv6 address
<IPv6_address>
dest_port
Destination port number (e.g. 80 for http)
<number>
user
Username (up to 20 bytes)
<string> (“na” if not available)
created_count
Created flows count
<number>
t_int
Observation time interval, msec
<number>
Last modified 1yr ago