Re: Port 113 Traffic

From: Martin McCormick (martin@dc.cis.okstate.edu)
Date: 02/04/02 

To: freebsd-security@FreeBSD.ORG
Date: Mon, 04 Feb 2002 13:14:44 -0600
From: Martin McCormick <martin@dc.cis.okstate.edu>

        Thank you to all of you who have answered.

        One of the first things I did was to look in
/etc/services which is what I usually do if there is a question
about what this or that port is used for and it did show up as
auth, all right. A man on auth yielded the auth_getval function
in C and not much else so I knew it was some kind of
authorization engine and that's where my trail ran a bit cold.

        I checked out ident and learned what rcs is for, but
never found any reference to auth so I greatly appreciate the
information that links it with sendmail, etc.

        I may block it experimentally and see if anything does
break since I have ipfw running and it is a simple matter to add
a new rule or remove it later. Sendmail is the only service I am
running that I might break by closing that port so I will close
it and see if sendmail still runs.

Martin

Andrew Kenneth Milton writes:
>113 is the ident/auth port.
>
>There are a number of things that query the ident port, IRC servers,
>sendmail, and squid to name a few. It's probably nothing to be worried about.
>
>If you block it and something stops working, I'm sure someone will scream
>at you d8)
>
>--
>Totally Holistic Enterprises Internet| | Andrew Milton
>The Internet (Aust) Pty Ltd | |
>ACN: 082 081 472 ABN: 83 082 081 472 | M:+61 416 022 411 | Carpe Daemon
>PO Box 837 Indooroopilly QLD 4068 |akm@theinternet.com.au|
>
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