How to Search For IP Addresses in a Log File

How to Search For IP Addresses in a Log File

In this article I’ll show you how to use the grep command to search for IP addresses in a log file. You can pipe the output of grep through uniq to find counts for each IP address. In this example, two IP addresses were found 42 times, and the second was found only once, but the log file had 16 entries for both of them. You can use the same building blocks in nearly any situation.

GigaVUE H Series node logging command

GigaVUE H Series nodes can be configured to log events using syslog information. You can configure syslog by specifying an IP address. The node then sends logged additional info events via UDP to an external syslog server. IPv6 addresses are supported, and hostnames can be used starting with software version 4.7.

HTTP URL for logging

The HTTP URL for logging is a unique identifier generated by Loggly. You can change it at any time to provide a different URL. The data payload of a POST request should be between 100KB and 1MB. The URL of the logging service should not exceed that limit. The processing rules described here are intended for log data. The metric data cannot be logged through the same URL. To find the HTTP URL for logging, you should use the Control Panel.

X-Forwarded-For header

When a web server receives a request, it adds a special header field called X-Forwarded-For (XFF) to it that tells us the originating IP address of the client. It is useful in cases when there is a load balancer or HTTP proxy, because XFF can reveal who is sending and receiving data. When a server is logged into a log file, it can reveal where a request originated.

LiveJournal accounts

If you have a paid account, you can use any theme, but if you have a free account, you’re limited to using “The Boxer” layout. To protest this, LiveJournal users staged a one-day boycott of the site on June 6. The blackout left LiveJournal unavailable for 24 hours. But it wasn’t all bad news. LiveJournal system administrators managed to bring back 100 servers.

LiveJournal logs

If you’re wondering if you should log IP addresses of commenters, you can enable it in your account settings. Go to the Privacy tab of your My Account settings, and enable the “Comment IP Logging” option. You can also choose whether you want to log IP addresses for everyone or just anonymous commenters. You can even enable logging for nobody. Once you’ve enabled this option, you can see the IP address of each commenter who makes a comment.

WebLogic Server logs

To enable logs to appear in WebLogic, configure your servers to listen to all addresses instead of just one. In this example, we’ll use to connect to WebLogic 10.3. On the server’s General Settings tab, click Listener Address. Then, in the Configuration File, enter a unique IP address for each server. We’ll see this configuration in the following sections.