How to enable IP address logging with Log4Net

Question

I'm looking a way to enable IP logging with log4net in ASP.NET. I found one solution but it works at Application level. Any suggestions/practices how to log IP at session level?

Thanks

Answer 1

With log4net 1.2.11 (Oct 2011) you add the following to your pattern layout:

%aspnet-request{REMOTE_ADDR}

Or for the current user:

%aspnet-request{AUTH_USER}

See https://issues.apache.org/jira/browse/LOG4NET-87 for more info on the new asp.net patterns converters (%aspnet-cache, %aspnet-context, and %aspnet-request).

Answer 2

In Application_BeginRequest, do

MDC.Set("addr", Request.UserHostAddress);

and then ensure that your PatternLayout contains %X{addr} somewhere in the pattern string.

Update: As Tadas has pointed out, in newer versions of log4net the equivalent is

ThreadContext.Properties["addr"] = Request.UserHostAddress;

coupled with %P{addr} in the pattern string.