From: Patrick Maartense <patrick@patrick.at>
To: Ralf Spenneberg <lists@spenneberg.org>
Cc: Netfilter <netfilter@lists.netfilter.org>
Subject: Re: How to block all ports except port 21,22,80,8080 ???
Date: Tue, 18 Feb 2003 11:15:21 +0100 [thread overview]
Message-ID: <3E5207B9.7C2BEDFA@patrick.at> (raw)
In-Reply-To: 1045560648.1913.39.camel@kermit.spenneberg.de
it would be MUCH better to
iptables -p INPUT DROP # default drop
then allow only these ports
iptables -A INPUT -p tcp -m multiport --dport 21,22,80,8080 -j ACCEPT
safe thinking: Default : drop, allow only what needed.
Ralf Spenneberg wrote:
> Am Die, 2003-02-18 um 09.57 schrieb Ralf Spenneberg:
> > Am Die, 2003-02-18 um 09.12 schrieb jacob_chan:
> > > How to block all ports except port 21,22,80,8080 ???
> > >
> > > Dear all,
> > >
> > > I want to block all ports except port 21,22,80,8080.
> > Block for what? Input? What protocol? TCP?
> > iptables -A INPUT -p tcp ! --dport 21,22,80,8080 -j DROP
> Missed the multiport part:
>
> iptables -A INPUT -p tcp -m multiport ! --dport 21,22,80,8080 -j DROP
>
> > Cheers,
> >
> > Ralf
> > >
> > > Any help appreciated.
> > >
> > > Best regards,
> > >
> > > Jacob
> > --
> > Ralf Spenneberg
> > RHCE, RHCX
> >
> > IPsec/PPTP Kernels for Red Hat Linux:
> > http://www.spenneberg.com/.net/.org/.de
> > Honeynet Project Mirror: http://honeynet.spenneberg.org
> > Snort Mirror: http://snort.spenneberg.org
> --
> Ralf Spenneberg
> RHCE, RHCX
>
> IPsec/PPTP Kernels for Red Hat Linux:
> http://www.spenneberg.com/.net/.org/.de
> Honeynet Project Mirror: http://honeynet.spenneberg.org
> Snort Mirror: http://snort.spenneberg.org
next prev parent reply other threads:[~2003-02-18 10:15 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-02-18 8:12 How to block all ports except port 21,22,80,8080 ??? jacob_chan
2003-02-18 8:57 ` Ralf Spenneberg
2003-02-18 9:30 ` Ralf Spenneberg
2003-02-18 10:15 ` Patrick Maartense [this message]
2003-02-18 12:45 ` Ralf Spenneberg
2003-02-18 13:40 ` How to Block MSN Miguel Amador L.
2003-02-18 15:49 ` Arnt Karlsen
2003-02-18 16:03 ` How to block all ports except port 21,22,80,8080 ??? Alexander W. Janssen
2003-02-18 12:19 ` Re2: " Pablo Allietti
2003-02-18 19:40 ` Alexander W. Janssen
2003-02-18 19:51 ` Re2: " Alexander W. Janssen
2003-02-18 9:02 ` Joel Newkirk
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