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iptables rules for desktop computers

Today I will show you the iptables rules I set on my main personal computer, with detailed comments about why I came to use these rules after several years of Linux desktop usage. The rules I use now have been simplified as much as I could and are based on common rules and advice that can be found on the network and also on input I got from experienced network administrators. I
So here they are:

# iptables -v -L
Chain INPUT (policy DROP 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination
 663K  905M ACCEPT     all  --  any    any     anywhere             anywhere            state RELATED,ESTABLISHED
  105  6300 ACCEPT     all  --  lo     any     anywhere             anywhere
    0     0 ACCEPT     icmp --  any    any     anywhere             anywhere            icmp destination-unreachable
    0     0 ACCEPT     icmp --  any    any     anywhere             anywhere            icmp time-exceeded
    0     0 ACCEPT     icmp --  any    any     anywhere             anywhere            icmp source-quench
    0     0 ACCEPT     icmp --  any    any     anywhere             anywhere            icmp parameter-problem
    0     0 DROP       tcp  --  any    any     anywhere             anywhere            tcp flags:!FIN,SYN,RST,ACK/SYN state NEW

Chain FORWARD (policy DROP 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination

Chain OUTPUT (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination

We

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