Re: IP Tables blocking SMTP
- From: "J.O. Aho" <user@xxxxxxxxxxx>
- Date: Wed, 26 Mar 2008 16:02:08 +0100
Leonard wrote:
Hi,
I need to block SMTP relay attempts from a specific IP on my lan.
I have setup the sendmail access file to only allow relaying from the
machines that need to but still get relaying denied in my maillog.
That is what you should get, otherwise the relay had worked for the blocked host.
Is there a way I can use IP tables to block relaying attempts from a specific IP address ?
Yes, you can block IPs with iptables, but you shouldn't, as your SMTP will not anymore be following the standard and can end in a blacklist as badly configured SMTP.
iptables -A INPUT -p 17 -s 1.1.1.2 -d 1.1.1.1/255.255.255.0 --dport 1 -j DROP
I do suggest you use logrotate on your system, that way your logfiles won't grow forever.
For checking the logs, I do suggest you take a look at logwatch, it will put together a nice report and if you see something fishy there, then you can move over to manually check the log files.
--
//Aho
.
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