From: "Taylor, Grant" <gtaylor@riverviewtech.net>
To: netfilter@lists.netfilter.org
Subject: Re: POP3 (Port No. 110)
Date: Tue, 31 May 2005 02:07:38 -0500 [thread overview]
Message-ID: <429C0D3A.9060703@riverviewtech.net> (raw)
In-Reply-To: <9bc7d29205053023395fb1fc5a@mail.gmail.com>
> I have Sendmail configured on my server and I am able to send and
> receive mails in the intranet. Now I want to be able to access the
> mails from outside world also but i dont want to open the port for
> every one. I want to open the pop3 port for the perticular IP (it may
> be static or dynamic IP) in the IPTABLES and close the port when not
> needed to access from outside.
>
> Please some one tell me how to do this and can I have some script
> which will open the port when i need and close when not needed so that
> I don't have to enter into the iptables every time.
>
> How to open the pop3 port for a perticular external ipaddress
Presuming that you are not filtering on output it is easy to allow a specific IP access to your POP3 server.
iptables -t filter -A INPUT -s ! ${known_external_ip_address} -p tcp --dport 110 -j DROP
This will drop any traffic that comes to port 110 that is not from the known external ip address.
If you are wanting more help setting up a script to manage this for you such that you can say pop_open and / or pop_close let me know and I'll see what I can whip up.
Grant. . . .
next prev parent reply other threads:[~2005-05-31 7:07 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-05-31 6:39 POP3 (Port No. 110) Vinod H
2005-05-31 7:07 ` Taylor, Grant [this message]
2005-05-31 7:59 ` Georgi Alexandrov
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