Setting firewall/iptables sederhana di linux

Saya post ini salah satu tujuannya spy saya gampang cari catatan jg sih πŸ˜›

Fungsi dari iptables a/ untuk buka tutup port sesuai keinginan kita, salah satu contoh sederhananya spt berikut ini:


# Allows all loopback traffic and drop all traffic to 127/8 that doesn't use lo
-A INPUT -i lo -j ACCEPT
-A INPUT ! -i lo -d -j REJECT

# Accepts all established inbound connections

# Allows all outbound traffic

-A INPUT -p tcp -m tcp --dport 22 -j ACCEPT
-A INPUT -p tcp -m tcp --dport 80 -j ACCEPT
-A INPUT -p tcp -m tcp --dport 443 -j ACCEPT
-A INPUT -p tcp -m tcp --dport 25 -j ACCEPT
-A INPUT -p tcp -m tcp --dport 143 -j ACCEPT
-A INPUT -p tcp -m tcp --dport 110 -j ACCEPT
-A INPUT -p icmp -m icmp --icmp-type 8 -j ACCEPT
-A INPUT -p tcp -m tcp --dport 113 -j ACCEPT

# Log
-I INPUT 5 -m limit --limit 5/min -j LOG --log-prefix "iptables denied: " --log-level 7

# Reject all other inbound - default deny unless explicitly allowed policy


LangkahΒ² utk seting iptables :
1. Buat file iptables, misalnya
nano /etc/iptables.conf
2. Kemudian copas contoh iptables diatas kedalamnya
3. Simpan file dan keluar
4. Restart iptablesnya
iptables-restore /etc/iptables.conf

Angka2 di file tersebut adalah port yg terbuka, sisanya ditutup, jika ingin buka port misalnya 12345 maka tambahkan baris :
-A INPUT -p tcp -m tcp --dport 12345 -j ACCEPT
sebelum baris -A INPUT -j REJECT

Semoga bermanfaat πŸ™‚

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  1. ryurazen

    October 24, 2015 at 12:06 am

    Thx gan for the info πŸ˜€

    • admin

      August 27, 2016 at 10:53 am

      sama2 gan πŸ˜€

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