CentOS 방화벽 설정

/etc/sysconfig/iptables 에 수정

/etc/rc.d/init.d/iptables

Usage: iptables -[AD] chain rule-specification [options]
      iptables -[RI] chain rulenum rule-specification [options]
      iptables -D chain rulenum [options]
      iptables -[LFZ] [chain] [options]
      iptables -[NX] chain
      iptables -E old-chain-name new-chain-name
      iptables -P chain target [options]
      iptables -h (print this help information)

Commands:
Either long or short options are allowed.
  --append  -A chain            Append to chain
  --delete  -D chain            Delete matching rule from chain
  --delete  -D chain rulenum
                               Delete rule rulenum (1 = first) from chain
  --insert  -I chain [rulenum]
                               Insert in chain as rulenum (default 1=first)
  --replace -R chain rulenum
                               Replace rule rulenum (1 = first) in chain
  --list    -L [chain]          List the rules in a chain or all chains
  --flush   -F [chain]          Delete all rules in  chain or all chains
  --zero    -Z [chain]          Zero counters in chain or all chains
  --new     -N chain            Create a new user-defined chain
  --delete-chain
           -X [chain]          Delete a user-defined chain
  --policy  -P chain target
                               Change policy on chain to target
  --rename-chain
           -E old-chain new-chain
                               Change chain name, (moving any references)
Options:
  --proto       -p [!] proto    protocol: by number or name, eg. `tcp'
  --source      -s [!] address[/mask]
                               source specification
  --destination -d [!] address[/mask]
                               destination specification
  --in-interface -i [!] input name[+]
                               network interface name ([+] for wildcard)
  --jump        -j target
                               target for rule (may load target extension)
  --match       -m match
                               extended match (may load extension)
  --numeric     -n              numeric output of addresses and ports
  --out-interface -o [!] output name[+]
                               network interface name ([+] for wildcard)
  --table       -t table        table to manipulate (default: `filter')
  --verbose     -v              verbose mode
  --line-numbers                print line numbers when listing
  --exact       -x              expand numbers (display exact values)
[!] --fragment  -f              match second or further fragments only
  --modprobe=<command>          try to insert modules using this command
  --set-counters PKTS BYTES     set the counter during insert/append
[!] --version   -V              print package version.