Firewall, ping and nmap
From: getting_out (getting_out_at_tele2.it)
Date: 11/02/03
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Date: Sun, 02 Nov 2003 12:55:21 +0100 To: security-basics <security-basics@securityfocus.com>
Good morning.
I have a debian woody on witch I've configured a firewall (iptables)
with the following rules
$ sudo iptables -L
Chain INPUT (policy ACCEPT)
target prot opt source destination
block all -- anywhere anywhere
Chain FORWARD (policy ACCEPT)
target prot opt source destination
block all -- anywhere anywhere
Chain OUTPUT (policy ACCEPT)
target prot opt source destination
Chain block (2 references)
target prot opt source destination
ACCEPT all -- anywhere anywhere state RELATED,ESTABLISHED
REJECT all -- anywhere anywhere reject-with icmp-port-unreachable
If I'm connected on the internet, via modem (ppp0), I can do a ping and
get responses from hosts. If I'm connected in a LAN, and do a ping, I
don't receive any response unless I shut down the firewall (iptables -F).
With npam, instead I must always shut down the firewall.
Can anyone enlighten me?
thanks and bye
Dvd (<-- It's for David :))
PS: please, forgive my English
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