Hi, I have a home server and workstation. Values used in LTSP setup are Server: 192.168.0.1 WS01: 192.168.0.2 Gateway: 192.168.0.1
I have used Oskar Andreasson's rc.firewall.txt <http://iptables-tutorial.frozentux.net/scripts/rc.firewall.txt> script as a template < http://iptables-tutorial.frozentux.net/iptables-tutorial.html#RCFIREWALLTXT > but can't connect to the net after running /home/adam$ ./iptables unless I then run the 'flush-iptables' script. I'm fairly sure there is a simple error here. LTSP values and Oskar's script should be right but I may have bungled INET_BROADCAST and LAN_IP_RANGE I'd be grateful if someone could tell me where I've gone wrong. Adam Bogacki, [EMAIL PROTECTED] > #!/bin/sh > > > INET_IP="192.168.0.1" > INET_IFACE="eth0" > INET_BROADCAST="192.168.0.100" > > LAN_IP="192.168.0.2" > LAN_IP_RANGE="192.168.0.0/16" > LAN_IFACE="eth1" > > LO_IFACE="lo" > LO_IP="127.0.0.1" > > IPTABLES="/usr/sbin/iptables" > > /sbin/depmod -a > > /sbin/modprobe ip_tables > /sbin/modprobe ip_conntrack > /sbin/modprobe iptable_filter > /sbin/modprobe iptable_mangle > /sbin/modprobe iptable_nat > /sbin/modprobe ipt_LOG > /sbin/modprobe ipt_limit > /sbin/modprobe ipt_state > > > echo "1" > /proc/sys/net/ipv4/ip_forward > > iptables -P INPUT DROP > iptables -P OUTPUT DROP > iptables -P FORWARD DROP > > iptables -N bad_tcp_packets > > iptables -N allowed > iptables -N tcp_packets > iptables -N udp_packets > iptables -N icmp_packets > > iptables -A bad_tcp_packets -p tcp --tcp-flags SYN,ACK SYN,ACK \ > -m state --state NEW -j REJECT --reject-with tcp-reset > iptables -A bad_tcp_packets -p tcp ! --syn -m state --state NEW -j LOG \ > --log-prefix "New not syn:" > iptables -A bad_tcp_packets -p tcp ! --syn -m state --state NEW -j DROP > > iptables -A allowed -p TCP --syn -j ACCEPT > iptables -A allowed -p TCP -m state --state ESTABLISHED,RELATED -j > ACCEPT > iptables -A allowed -p TCP -j DROP > > iptables -A tcp_packets -p TCP -s 0/0 --dport 21 -j allowed > iptables -A tcp_packets -p TCP -s 0/0 --dport 22 -j allowed > iptables -A tcp_packets -p TCP -s 0/0 --dport 80 -j allowed > iptables -A tcp_packets -p TCP -s 0/0 --dport 113 -j allowed > > #$IPTABLES -A udp_packets -p UDP -s 0/0 --destination-port 53 -j ACCEPT > #$IPTABLES -A udp_packets -p UDP -s 0/0 --destination-port 123 -j ACCEPT > iptables -A udp_packets -p UDP -s 0/0 --destination-port 2074 -j ACCEPT > iptables -A udp_packets -p UDP -s 0/0 --destination-port 4000 -j ACCEPT > > iptables -A icmp_packets -p ICMP -s 0/0 --icmp-type 8 -j ACCEPT > iptables -A icmp_packets -p ICMP -s 0/0 --icmp-type 11 -j ACCEPT > > iptables -A INPUT -p tcp -j bad_tcp_packets > > iptables -A INPUT -p ALL -i $LAN_IFACE -s $LAN_IP_RANGE -j ACCEPT > iptables -A INPUT -p ALL -i $LO_IFACE -s $LO_IP -j ACCEPT > iptables -A INPUT -p ALL -i $LO_IFACE -s $LAN_IP -j ACCEPT > iptables -A INPUT -p ALL -i $LO_IFACE -s $INET_IP -j ACCEPT > > iptables -A INPUT -p UDP -i $LAN_IFACE --dport 67 --sport 68 -j ACCEPT > > iptables -A INPUT -p ALL -d $INET_IP -m state --state > ESTABLISHED,RELATED \ > -j ACCEPT > iptables -A INPUT -p TCP -i $INET_IFACE -j tcp_packets > iptables -A INPUT -p UDP -i $INET_IFACE -j udp_packets > iptables -A INPUT -p ICMP -i $INET_IFACE -j icmp_packets > > iptables -A INPUT -m limit --limit 3/minute --limit-burst 3 -j LOG \ > --log-level DEBUG --log-prefix "IPT INPUT packet died: " > > iptables -A FORWARD -p tcp -j bad_tcp_packets > > iptables -A FORWARD -i $LAN_IFACE -j ACCEPT > iptables -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT > > iptables -A FORWARD -p tcp -j LOG --log-tcp-options > iptables -A FORWARD -m limit --limit 3/minute --limit-burst 3 -j LOG \ > --log-level DEBUG --log-prefix "IPT FORWARD packet died: " > > iptables -A OUTPUT -p tcp -j bad_tcp_packets > > iptables -A OUTPUT -p ALL -s $LO_IP -j ACCEPT > iptables -A OUTPUT -p ALL -s $LAN_IP -j ACCEPT > iptables -A OUTPUT -p ALL -s $INET_IP -j ACCEPT > > iptables -A OUTPUT -m limit --limit 3/minute --limit-burst 3 -j LOG \ > --log-level DEBUG --log-prefix "IPT OUTPUT packet died: " > > iptables -t nat -A POSTROUTING -o $INET_IFACE -j SNAT --to-source > $INET_IP > > 'iptables-save' gives me > Tux:/home/adam# iptables-save > # Generated by iptables-save v1.3.1 on Sun Jul 24 21:50:45 2005 > *mangle > :PREROUTING ACCEPT [21493:19009893] > :INPUT ACCEPT [21489:19009487] > :FORWARD ACCEPT [0:0] > :OUTPUT ACCEPT [19249:2744637] > :POSTROUTING ACCEPT [19387:2768585] > COMMIT > # Completed on Sun Jul 24 21:50:45 2005 > # Generated by iptables-save v1.3.1 on Sun Jul 24 21:50:45 2005 > *filter > :INPUT DROP [0:0] > :FORWARD DROP [0:0] > :OUTPUT DROP [0:0] > -A INPUT -i lo -j ACCEPT > -A INPUT -s 127.0.0.0/255.0.0.0 -i ! lo -j LOG > -A INPUT -s 127.0.0.0/255.0.0.0 -i ! lo -j DROP > -A INPUT -d 255.255.255.255 -i eth1 -j ACCEPT > -A INPUT -s 192.168.0.0/255.255.255.0 -i eth1 -j ACCEPT > -A INPUT -d 224.0.0.0/240.0.0.0 -i eth1 -p ! tcp -j ACCEPT > -A INPUT -s 192.168.0.0/255.255.255.0 -i eth0 -j LOG > -A INPUT -s 192.168.0.0/255.255.255.0 -i eth0 -j DROP > -A INPUT -d 255.255.255.255 -i eth0 -j ACCEPT > -A INPUT -d 203.79.110.81 -i eth0 -j ACCEPT > -A INPUT -d 203.79.110.255 -i eth0 -j ACCEPT > -A INPUT -j LOG > -A INPUT -j DROP > -A FORWARD -s 192.168.0.0/255.255.255.0 -i eth1 -o eth0 -j ACCEPT > -A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT > -A FORWARD -d 192.168.0.0/255.255.255.0 -o eth0 -j LOG > -A FORWARD -d 192.168.0.0/255.255.255.0 -o eth0 -j DROP > -A FORWARD -j LOG > -A FORWARD -j DROP > -A OUTPUT -o lo -j ACCEPT > -A OUTPUT -d 255.255.255.255 -o eth1 -j ACCEPT > -A OUTPUT -d 192.168.0.0/255.255.255.0 -o eth1 -j ACCEPT > -A OUTPUT -d 224.0.0.0/240.0.0.0 -o eth1 -p ! tcp -j ACCEPT > -A OUTPUT -d 192.168.0.0/255.255.255.0 -o eth0 -j LOG > -A OUTPUT -d 192.168.0.0/255.255.255.0 -o eth0 -j DROP > -A OUTPUT -d 255.255.255.255 -o eth0 -j ACCEPT > -A OUTPUT -s 203.79.110.81 -o eth0 -j ACCEPT > -A OUTPUT -s 203.79.110.255 -o eth0 -j ACCEPT > -A OUTPUT -j LOG > -A OUTPUT -j DROP > COMMIT > # Completed on Sun Jul 24 21:50:47 2005 > # Generated by iptables-save v1.3.1 on Sun Jul 24 21:50:47 2005 > *nat > :PREROUTING ACCEPT [218:16878] > :POSTROUTING ACCEPT [1309:90379] > :OUTPUT ACCEPT [1309:90379] > -A POSTROUTING -s 192.168.0.0/255.255.255.0 -o eth0 -j MASQUERADE > COMMIT > # Completed on Sun Jul 24 21:50:48 2005 > Tux:/home/adam# > -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". 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