Re: howto block ports
- To: email@example.com
- Subject: Re: howto block ports
- From: "daniel" <firstname.lastname@example.org>
- Date: Thu, 26 Feb 2004 17:32:02 +0100 (CET)
- Message-id: <email@example.com>
- Reply-to: firstname.lastname@example.org
- In-reply-to: <jUsT.aNoTheR.mEsSaGe.iD.107771849725975non specified
- References: <jUsT.aNoTheR.mEsSaGe.iD.107771849725975non specified
Maybe you are doing "-j REJECT" for those ports instead of "-j DROP"?
<quote who="Harland Christofferson">
> i have had a firewall configured to drop inbound packets on ports
> that i am not using via iptables. i ran a port scanning utility from
> an external machine. the utility detected that, although the ports
> were _closed_, the ports still responded to the port scan utility.
> i suspect that data destine for these _closed_ ports is being put
> in the TCP/UDP stack. i further suspect that malicious code could
> take advantage of bugs in the stack if there are any. i wish to be
> able to _block_ these ports entirely. i do not have the services
> running in the /etc/inetd.conf file.
> how may i do this? i have read some firewall-ing howtos but the ones
> i have read refer to iptables (or ipchains). by the way, i am running
> a 2.4.18 kernel.
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