Security Basics mailing list archives
Firewall, ping and nmap
From: getting_out <getting_out () tele2 it>
Date: Sun, 02 Nov 2003 12:55:21 +0100
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-unreachableIf 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 --------------------------------------------------------------------------- Forum Systems PRESIDIO: PGP / XML GATEWAY APPLIANCEThe Presidio integrates PGP data encryption and XML Web Services security to simplify the management and deployment of PGP and reduce overall PGP costs by up to 80%. FREE WHITEPAPER & 30 Day Trial - http://www.securityfocus.com/sponsor/ForumSystems_security-basics_031027 ----------------------------------------------------------------------------
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