Red Hat

# Firewall configuration written by system-config-firewall
# Manual customization of this file is not recommended.
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
-A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
-A INPUT -p icmp -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -j REJECT --reject-with icmp-host-prohibited

-N LOGGING
-A INPUT -j LOGGING
-A LOGGING -j DROP

##ALLOW ANY to the following ports
-A INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT
COMMIT

# Reject spoofed packets
-A INPUT -s 10.0.0.0/8 -j DROP
-A INPUT -s 169.254.0.0/16 -j DROP
-A INPUT -s 172.16.0.0/12 -j DROP
-A INPUT -s 127.0.0.0/8 -j DROP

-A INPUT -s 224.0.0.0/4 -j DROP
-A INPUT -d 224.0.0.0/4 -j DROP
-A INPUT -s 240.0.0.0/5 -j DROP
-A INPUT -d 240.0.0.0/5 -j DROP
-A INPUT -s 0.0.0.0/8 -j DROP
-A INPUT -d 0.0.0.0/8 -j DROP
-A INPUT -d 239.255.255.0/24 -j DROP
-A INPUT -d 255.255.255.255 -j DROP

# NULL packets
-A INPUT -p tcp --tcp-flags ALL NONE -j DROP


# Syn-flood attack
-A INPUT -p tcp ! --syn -m state --state NEW -j DROP

# XMAS packets
-A INPUT -p tcp --tcp-flags ALL ALL -j DROP

#Force Fragments packets check
-A INPUT -f -j DROP

# Stop smurf attacks
-A INPUT -p icmp -m icmp --icmp-type address-mask-request -j DROP
-A INPUT -p icmp -m icmp --icmp-type timestamp-request -j DROP
-A INPUT -p icmp -m icmp -j DROP

# Drop all invalid packets
-A INPUT -m state --state INVALID -j DROP
-A FORWARD -m state --state INVALID -j DROP
-A OUTPUT -m state --state INVALID -j DROP

# Drop excessive RST packets to avoid smurf attacks
-A INPUT -p tcp -m tcp --tcp-flags RST RST -m limit --limit 2/second --limit-burst 2 -j ACCEPT

# Attempt to block portscans
# Anyone who tried to portscan us is locked out for an entire day.
-A INPUT -m recent --name portscan --rcheck --seconds 86400 -j DROP
-A FORWARD -m recent --name portscan --rcheck --seconds 86400 -j DROP

# Once the day has passed, remove them from the portscan list
-A INPUT -m recent --name portscan --remove
-A FORWARD -m recent --name portscan --remove

# These rules add scanners to the portscan list, and log the attempt.
-A INPUT -p tcp -m tcp --dport 139 -m recent --name portscan --set -j LOG --log-prefix "Portscan:"
-A INPUT -p tcp -m tcp --dport 139 -m recent --name portscan --set -j DROP

-A FORWARD -p tcp -m tcp --dport 139 -m recent --name portscan --set -j LOG --log-prefix "Portscan:"
-A FORWARD -p tcp -m tcp --dport 139 -m recent --name portscan --set -j DROP

Originally Posted by ranjancom2000

I don't understand the logic why it was not working if i put after reject.

Originally Posted by ranjancom2000

Ok then i think i will place REJECT @ below of all lines. And all DROP will be placed after ACCEPT it will right