Re: Open ports on FC2

[netmask <netmask enZotech net>]

You can follow the others advice for iptables stuff.. or shutting down 
services.. in addition, you could block ICMP via iptables..

but I prefer to disable it via proc

echo "1" >/proc/sys/net/ipv4/icmp_echo_ignore_all

However.. ICMP serves a purpose.. if you are running a server, it isn't 
recommended that you disable it.

You can find all open ports, and what applications are using them via:
lsof -i -n

--
netmask

> John Dangler (jdangler atlantic net) composed today:

> I went to the ShieldsUP!!! site and ran the file sharing and common ports
> tests.  According to the results, I allowed ping to reply to their server
> via ICMP echo, and I have port 21 (ftp) and 23 (telnet) open.  How do I:
>
> (1) block/ignore ICMP echo requests
> (2) Tell inquirers that ports 21 and 23 exist but are closed to connections
>
> Thanks for the feedback.
>
> John Dangler
>
>
>
>
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