Date: Sat, 14 Jun 2003 10:13:08 -0300 From: Paulo Fragoso <paulo@nlink.com.br> To: freebsd-isp@freebsd.org Subject: Limit for smtp connection Message-ID: <3EEB1F64.3000706@nlink.com.br>
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Hi, How can we limit the number of simultaneously accepted connections from the same IP address to our smtp server? We are using qmail+daemontools+spamcontrol+qmailscanner+spamd, but sometimes there are floods from same IP to our server (smtp port), reaching connetions limit configured on tcpserver startup (tcpserver -c #). We can't increase this limit because it can kill other process by out swap (DoS). We have found some SMTP server on the internet which accept no more than 5 simultaneusly connection from our SMTP server. How to implement this using qmail+tcpserver? Paulo.
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