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From: Joel Newkirk <netfilter@newkirk.us>
To: juanca <juanca@sat.com.py>
Cc: netfilter@lists.netfilter.org
Subject: Re: Problems with my mail server
Date: 16 Apr 2003 22:28:09 -0400	[thread overview]
Message-ID: <1050546489.22423.4.camel@alpha.newkirk.us> (raw)
In-Reply-To: <098601c30486$14521bc0$0f00a8c0@juancarlitos>

On Wed, 2003-04-16 at 22:07, juanca wrote:
> I´ve implemented this firewall but when I started it
> My mail server doesn´t work
> what might it be problem?
> iptables -A INPUT -s 192.168.0.15 -j ACCEPT
> iptables -A INPUT -s 192.168.0.25 -j ACCEPT
> 
> iptables -A INPUT -s 127.0.0.1 -j ACCEPT
> 
> iptables -A INPUT -p tcp --dport domain -j ACCEPT

DNS usually runs on udp 53, not tcp.  Also, you probably shoud have udp
53 open in OUTPUT as well as INPUT.

> iptables -A INPUT -p tcp --dport http -j ACCEPT
> iptables -A INPUT -p tcp --dport https -j ACCEPT
> iptables -A INPUT -p tcp --dport ftp -j ACCEPT
> iptables -A INPUT -p tcp --dport ftp-data -j ACCEPT
> iptables -A INPUT -p tcp --dport ftps -j ACCEPT
> iptables -A INPUT -p tcp --dport ftps-data -j ACCEPT
> iptables -A INPUT -p tcp --dport pop3 -j ACCEPT
> iptables -A OUTPUT -p tcp --dport pop3 -j ACCEPT
> iptables -A INPUT -p tcp --dport pop3s -j ACCEPT
> iptables -A INPUT -p tcp --dport  smtps -j ACCEPT
> iptables -A INPUT -p tcp --dport smtp -j ACCEPT
> iptables -A OUTPUT -p tcp --dport smtp -j ACCEPT -j ACCEPT
> iptables -A INPUT -p tcp --dport 113 -j ACCEPT
> iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
> iptables -A OUTPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
> iptables -A INPUT -j DROP

Do you have DROP policy for INPUT (and/or OUTPUT)?  If so,
you don't need this last rule.  If not, you probably should.

j




  reply	other threads:[~2003-04-17  2:28 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20030416125602.18155.44510.Mailman@kashyyyk>
2003-04-17  2:07 ` Problems with my mail server juanca
2003-04-17  2:28   ` Joel Newkirk [this message]
2003-04-17  9:54     ` Achim Dreyer

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