Specify IP addresses for logging to the local syslog and use 0 (or 0.0.0.0) as the minimum severity. You can use grep, regular expression syntax, and uniq to find duplicate counts. This building block is applicable to almost any situation. For example, you can filter the output of grep with uniq to see the number of events that were duplicated. This building block can be applied to the data analytics of IP addresses logged to the local syslog.
0 (or 0.0.0.0) IP address for logging
Using a dotted-decimal IP address (0.0.0.0) for logging is an easy way to ensure the IP address logging is accurate. This address explanation syntax is widely used because it represents the default behavior of many routers. By default, an IP address is bound to a port or an address. The “subnet mask” refers to the number of bits that can change in an IP address.
The 0000-prefix is a placeholder address for Internet Protocol addresses. It’s sometimes referred to as a wildcard address or an unknown IP address. It has different meanings on client devices. For example, PCs show 0.0.0.0 as the default IP address if they’re offline. If a DHCP server fails to assign a unique IP address to a computer, it will automatically assign the same IP address. This identifies the default route and is not used to communicate with other devices on the network.
Specifies minimum severity for an event to be logged to the local syslog
The syslog network protocol is a simplex communication protocol that allows messages to be separated from their origins and send to the syslog servers. Messages that match this definition must be 480 octets long and include a decimal severity level indicator. In addition, a leading “0” is not allowed in the message. This feature is particularly useful for security purposes.
If you’ve configured a local syslog server, you can use this command to send logs to the server. The port numbers 0 to 1024 are reserved for system use. The masked argument masks IPv4 and IPv6 addresses and MAC addresses. The severity level you’ll see for each event is listed in the Severity Levels for Logging Commands.
Data analytics on IP address for logging
IP addresses are useful for security logging. Not only do they identify malicious users, but they can also reveal the origin of traffic. IP address data can help identify patterns of attack, so a security company can act quickly to prevent future attacks. By using IP address data in data analytics, companies can determine how effective their security measures are and can develop plans for future security. Listed below are some of the ways to use IP address data for security.
The first step is detecting patterns in IP data. For example, a reasonably-sized sample of events involving IP “10.0.0.130” will occur with a GET request in 70% of cases and with a POST request in 30% of cases. All other IP addresses have a POST/GET ratio of around 95 percent. Once this model is trained and tested, it can detect cyberattack patterns.