Identd Setup

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The Ident service as specified by RFC 1413 is mostly used by various IRC networks and the occasional old FTP server to ask a remote server which user is making a connection. This method is quite untrustworthy, as the remote host can simply choose to lie.

So you have two choices:

  1. Tell the truth (see pidentd below)
  2. Tell a little white lie (see nullident below)


Like most people, I prefer to run identd from from inetd instead of as a stand-alone service. For this to work you will need to install two packages: xinetd and pidentd. I tried this with oidentd but it does not seem to work with the latest xinetd.

1. Install needed software

# pacman -S xinetd pidentd

2. Next, you will need to paste the following into a new file and save it as /etc/xinetd.d/auth

service auth
      flags = REUSE
      socket_type = stream
      wait = no
      user = nobody
      server = /usr/sbin/identd
      server_args = -m -N
      logonfailure += USERID
      disable = no

3. After you have saved the new file, run xinetd with the following command

# /etc/rc.d/xinetd start

If all went well, you should have the auth service running on port 113. A good way of checking this is by installing nmap (if you do not have it already) and typing

$ nmap localhost