asp net read barcode from image iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE in Software

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iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
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In addition, to allow ping and destination-unreachable ICMP packets, you enter INPUT rules with the firewall as the destination. To enable ping operations, you use both echo-reply and echo-request ICMP types, and for destination unreachable, you use the destinationunreachable type:
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iptables -A INPUT -j ACCEPT -p icmp -i eth0 --icmp-type \ echo-reply -d 10.0.0.1 iptables -A INPUT -j ACCEPT -p icmp -i eth0 --icmp-type \ echo-request -d 10.0.0.1 iptables -A INPUT -j ACCEPT -p icmp -i eth0 --icmp-type \ destination-unreachable -d 10.0.0.1
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At the end, IP forwarding is turned on again:
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echo 1 > /proc/sys/net/ipv4/ip_forward
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A listing of these iptables options shows the different rules for each option, as shown here:
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# iptables -L Chain INPUT (policy DROP) target prot opt source LOG all -- !192.168.0.0/24 DROP all -- !192.168.0.0/24 DROP all -- 192.168.0.0/24 DROP all -- 127.0.0.0/8 ACCEPT all -- anywhere ACCEPT tcp -- 10.0.0.2 ACCEPT tcp -- 10.0.0.2 ACCEPT !icmp DROP all ACCEPT all ACCEPT icmp ACCEPT icmp ACCEPT icmp unreachable Chain FORWARD target prot DROP all DROP all DROP all DROP all ------anywhere anywhere 192.168.0.0/24 anywhere anywhere anywhere
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destination anywhere anywhere anywhere anywhere anywhere anywhere 192.168.0.0/24 anywhere anywhere anywhere 10.0.0.1 10.0.0.1 10.0.0.1
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tcp dpt:http state RELATED,ESTABLISHED tcp spt:http state RELATED,ESTABLISHED state NEW icmp echo-reply icmp echo-request icmp destination-
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(policy ACCEPT) opt source -- !192.168.0.0/24 -- 192.168.0.0/24 -- 127.0.0.0/8 -- anywhere
destination anywhere anywhere anywhere anywhere
state NEW
Chain OUTPUT (policy ACCEPT) target prot opt source destination DROP tcp -- anywhere 192.168.0.0/24 # iptables -t nat -L Chain PREROUTING (policy ACCEPT) target prot opt source destination Chain POSTROUTING (policy ACCEPT) target prot opt source destination MASQUERADE all -- anywhere anywhere Chain OUTPUT (policy ACCEPT) target prot opt source destination
state NEW tcp spt:http
For more complex rules, you may want to create your own chain to reduce repetition. A common method is to define a user chain for both INPUT and FORWARD chains, so that you do not have to repeat DROP operations for each. Instead you would have only one user chain that both FORWARD and INPUT chains would feed into for DROP operations. Keep in mind that both FORWARD and INPUT operations may have separate rules in addition to the ones they share. In the next example, the myfilter script has been rewritten, as myfilter2, with a user-defined chain called arriving. The chain is defined with the N option at the top of the script:
iptables N arriving
A user chain has to be defined before it can be used as a target in other rules. So, you have to first define and add all the rules for that chain, and then use it as a target. In the myfilter2 script, the arriving chain is defined and its rules added. Then, at the end of the file, it is used as a target for both the INPUT and FORWARD chains. The INPUT chain lists rules for accepting packets, whereas the FORWARD chain has an ACCEPT policy, which will accept them by default.
myfilter2
# )# Firewall Gateway system IP address is 10.0.0.1 using Ethernet device eth0 # Private network address is 192.168.0.0 using Ethernet device eth1 # Web site address is 10.0.0.2 # modprobe iptable_filter # turn off IP forwarding echo 0 > /proc/sys/net/ipv4/ip_forward iptables -N arriving # Flush chain rules iptables -F INPUT iptables -F OUTPUT iptables -F FORWARD iptables -F arriving # set default (policy) rules iptables -P INPUT DROP iptables -P OUTPUT ACCEPT iptables -P FORWARD ACCEPT # IP spoofing, deny any packets on the internal network that have an external source address. iptables -A arriving -j LOG -i eth1 \! -s 192.168.0.0/24 iptables -A arriving -j DROP -i eth1 \! -s 192.168.0.0/24 # IP spoofing, deny any outside packets (any not on eth1) that have the source address of the internal network iptables -A arriving -j DROP \! -i eth1 -s 192.168.0.0/24 # IP spoofing, deny any outside packets with localhost address # (packets not on the lo interface (any on eth0 or eth1) that have the source address of localhost) iptables -A arriving -j DROP -i \! lo -s 127.0.0.0/255.0.0.0 # allow all incoming messages for users on your firewall system iptables -A arriving -j ACCEPT -i lo # allow communication to the Web server (address 10.0.0.2), port www iptables -A arriving -j ACCEPT -p tcp -i eth0 dport www -s 10.0.0.2 # Allow established connections from Web servers to internal network iptables -A arriving -m state state ESTABLISHED,RELATED -i eth0 -p tcp sport www -s 10.0.0.2 -d 192.168.0.0/24 -j ACCEPT # Prevent new connections from Web servers to internal network iptables -A OUTPUT -m state state NEW -o eth0 -p tcp sport www -d 192.168.0.0/24 -j DROP
# allow established and related outside communication to your system # allow outside communication to the firewall, except for ICMP packets iptables -A arriving -m state state ESTABLISHED,RELATED -i eth0 -p \! icmp -j ACCEPT # prevent outside initiated connections iptables -A arriving -m state state NEW -i eth0 -j DROP
# allow all local communication to and from the firewall on eth1 from the local network iptables -A arriving -j ACCEPT -p all -i eth1 -s 192.168.0.0/24 # Set up masquerading to allow internal machines access to outside network iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE # Accept ICMP Ping (0 and 8) and Destination unreachable (3) messages # Others will be rejected by INPUT and OUTPUT DROP policy iptables -A arriving -j ACCEPT -p icmp -i eth0 icmp-type echo-reply -d 10.0.0.1 iptables -A arriving -j ACCEPT -p icmp -i eth0 icmp-type echo-request -d 10.0.0.1 iptables -A arriving -j ACCEPT -p icmp -i eth0 icmp-type destination-unreachable -d 10.0.0.1 iptables -A INPUT -j arriving iptables -A FORWARD -j arriving # Turn on IP Forwarding echo 1 > /proc/sys/net/ipv4/ip_forward
A listing of the rules is shown here:
# iptables L -n Chain INPUT (policy DROP) target prot opt source arriving all -- 0.0.0.0/0 Chain FORWARD (policy ACCEPT) target prot opt source arriving all -- 0.0.0.0/0 Chain OUTPUT (policy ACCEPT) target prot opt source DROP tcp -- 0.0.0.0/0 Chain arriving (2 references) target prot opt source LOG all -- !192.168.0.0/24 DROP all -- !192.168.0.0/24 DROP all -- 192.168.0.0/24 DROP all -- 127.0.0.0/8 ACCEPT all -- 0.0.0.0/0 ACCEPT tcp -- 10.0.0.2 ACCEPT tcp -- 10.0.0.2 RELATED,ESTABLISHED ACCEPT !icmp -- 0.0.0.0/0 RELATED,ESTABLISHED DROP all -- 0.0.0.0/0 ACCEPT all -- 192.168.0.0/24 ACCEPT icmp -- 0.0.0.0/0 ACCEPT icmp -- 0.0.0.0/0 ACCEPT icmp -- 0.0.0.0/0
destination 0.0.0.0/0 destination 0.0.0.0/0 destination 192.168.0.0/24 destination 0.0.0.0/0 0.0.0.0/0 0.0.0.0/0 0.0.0.0/0 0.0.0.0/0 0.0.0.0/0 192.168.0.0/24 0.0.0.0/0 0.0.0.0/0 0.0.0.0/0 10.0.0.1 10.0.0.1 10.0.0.1
state NEW tcp spt:80
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