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Since Apache 2.4 I've started using mod_remoteip instead of mod_extract_forwarded for rewriting client address from x-forwarded-for provided by frontend servers (varnish, squid, apache etc).

So far everything works fine with the modules, i.e. php, cgi, wsgi etc... - client addresses are shown as they should be, but I couldn't write client address in access logs (%a, %h, %{c}a). No luck - I'm always getting 127.0.0.1 (localhost forward ex.).

How to log client's ip address when using mod_remoteip?

Update: IT WORKS O_O - see answer below

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2 Answers 2

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varnish configuration:

if (req.restarts == 0) {
    if (req.http.X-Forwarded-For) {
        set req.http.X-Forwarded-For = req.http.X-Forwarded-For + ", " + client.ip;
    } else {
        set req.http.X-Forwarded-For = client.ip;
    }
}

apache 2.4 configuration sections:

mod_remoteip:

RemoteIPHeader X-Forwarded-For
RemoteIPInternalProxy 127.0.0.1/8

logging (%a does the job):

LogFormat "%a %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\"" combined

+

if there is a nginx in front (ex. SSL termination):

server {
    listen       123.123.123.123:443;
    server_name  server.com;
    root         html;

    ssl                  on;
    ssl_certificate      /etc/pki/httpd/site/chain.crt;
    ssl_certificate_key  /etc/pki/httpd/site/private.key;

    ssl_session_timeout  5m;

    ssl_protocols  SSLv2 SSLv3 TLSv1;
    ssl_ciphers  HIGH:!aNULL:!MD5;
    ssl_prefer_server_ciphers   on;

    location / {
        proxy_pass   http://127.0.0.1:6081;
        proxy_set_header Host $http_host;
        proxy_pass_header Server;
        proxy_set_header X-Forwarded-For $remote_addr;
    }
}
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  • 1
    If you accept this answer, you should award the bounty, even if it's your own answer.
    – mc0e
    Aug 31, 2014 at 6:36
  • Would you please update this, or give us the variation for http.cf-connecting-ip from CloudFlare? Have not had any luck making it to work, sorry. Mar 9, 2016 at 17:14
  • You should actually use $proxy_add_x_forwarded_for instead of $remote_addr for Nginx X-Forwarded-For. That does the same functionality as the Varnish example, whereas $remote_addr doesn't include previous X-Forwarded-For values
    – Andy
    Aug 10, 2017 at 18:11
5
+200

According to mod_remoteip's documentation, the module should simply replace the client IP address, but only when RemoteIPHeader x-forwarded-for is set (doc). Also make sure, your vhost's logging makes use of the CustomLog you have defined.

1
  • this should be accepted answer
    – Chang Zhao
    Oct 15, 2021 at 20:21

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