Nmap Development mailing list archives
Re: Operation not permitted
From: Przemek <przemek () skyline ltd pl>
Date: Mon, 2 May 2005 17:18:27 +0200
On Mon, 2 May 2005 12:03:10 -0300 Marlon Jabbur <msjabbur () uol com br> wrote:
Now It works but can I not allow INVALID on OUTPUT chain ?My iptables rules are the following: iptables -A OUTPUT -m state --state NEW,ESTABLISHED,RELATED,INVALID - j ACCEPT iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT The first one allows me to send the nmap packets and the last allows me to receive the answer. I don´t see any risk in allowing INVALID packets on the OUTPUT chain. I can see problems if you allow it on the INPUT chain.
Now It works but can I not allow INVALID on OUTPUT chain ?
Sorry, it was a mistake, I wanted to write INPUT instood of OUTPUT. Now my iptables rules are: IPTAB=/usr/sbin/ iptables echo 1 > /proc/sys/net/ipv4/ip_forward echo 1 > /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts echo 0 > /proc/sys/net/ipv4/conf/all/accept_source_route echo 1 > /proc/sys/net/ipv4/tcp_syncookies echo 0 > /proc/sys/net/ipv4/conf/all/accept_redirects echo 0 > /proc/sys/net/ipv4/conf/all/send_redirects echo 1 > /proc/sys/net/ipv4/conf/all/rp_filter echo 1 > /proc/sys/net/ipv4/conf/all/log_martians $IPTAB --flush $IPTAB -F INPUT $IPTAB -P INPUT DROP $IPTAB -F OUTPUT $IPTAB -P OUTPUT DROP $IPTAB -F FORWARD $IPTAB -P FORWARD DROP $IPTAB -t nat -F $IPTAB -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT $IPTAB -A OUTPUT -m state --state NEW,ESTABLISHED,RELATED,INVALID -j ACCEPT -- Przemysław Ciemniewski mailto:przemek () skyline ltd pl GG:155998 JID: tommy () chrome pl _______________________________________________ Sent through the nmap-dev mailing list http://cgi.insecure.org/mailman/listinfo/nmap-dev
Current thread:
- Operation not permitted Przemek (May 02)
- Re: Operation not permitted Marlon Jabbur (May 02)
- Re: Operation not permitted Przemek (May 02)
- Re: Operation not permitted Marlon Jabbur (May 02)
- Re: Operation not permitted Przemek (May 02)
- Re: Operation not permitted Przemek (May 02)
- Re: Operation not permitted Marlon Jabbur (May 02)