IPTables strange behavior
Hello all
I have a problem with IP tables. i have a web content filter server using iptables, squid and dansguardian. After months working on it i just kind of finish it. I just have a little problem When i restart it i cant access pop3/smtp from outlook on my workstations but if i copy and paste this the firewall script on a console it fixes the problem. if i do iptables -L -n before and after pasting the firewall script it gives me the exact same rules. also i have the firewall script file saved in /etc/init.d and made the shortcut in /etc/rc2.d also did the chmod 750 tp the file. what can be the problem??? Firewall Script**************** iptables -F iptables -X iptables -Z iptables -t nat -F iptables -P INPUT ACCEPT iptables -P OUTPUT ACCEPT iptables -P FORWARD ACCEPT iptables -t nat -P PREROUTING ACCEPT iptables -t nat -P POSTROUTING ACCEPT /sbin/iptables -A INPUT -i lo -j ACCEPT iptables -A INPUT -s 192.168.10.0/24 -i eth3 -j ACCEPT iptables -A FORWARD -s 192.168.10.0/24 -i eth3 -p tcp --dport 80 -j ACCEPT iptables -A FORWARD -s 192.168.10.0/24 -i eth3 -p tcp --dport 443 -j ACCEPT iptables -A FORWARD -s 192.168.10.0/24 -i eth3 -p tcp --dport 110 -j ACCEPT iptables -A FORWARD -s 192.168.10.0/24 -i eth3 -p tcp --dport 25 -j ACCEPT iptables -A FORWARD -s 192.168.10.0/24 -i eth3 -p tcp --dport 53 -j ACCEPT iptables -A FORWARD -s 192.168.10.0/24 -i eth3 -p udp --dport 53 -j ACCEPT iptables -A FORWARD -s 192.168.10.26/24 -i eth3 -p tcp --dport 4899 -j ACCEPT iptables -A FORWARD -s 192.168.10.0/24 -i eth3 -j DROP iptables -t nat -A POSTROUTING -s 192.168.10.0/24 -o eth0 -j MASQUERADE echo 1 > /proc/sys/net/ipv4/ip_forward iptables -A INPUT -s 0.0.0.0/0 -p tcp --dport 1:1024 -j DROP iptables -A INPUT -s 0.0.0.0/0 -p udp --dport 1:1024 -j DROP iptables -A INPUT -s 0.0.0.0/0 -p tcp --dport 10000 -j DROP ************************************************************************* |
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net.ipv4.ip_forward=1 You can test this theory out before making any changes by toggling 'ip_forward' on and off. When turned off do the problem symptoms reappear? |
thank you anomie.
Worked fine |
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