Harden network with sysctl settings

nah beberapa waktu lalu saat browsing saya sempat menemukan bacaan menarik tentang sysctl. cukup lah buat pertahanan sementara. kita coba saja ya .

1. buka terminal linux kemudian copy sysctl asli *(buat jaga-jaga
cp /etc/sysctl.conf /etc/sysctl.conf-old

2. buka file sysctl.conf dengan editor kesukaan anda . disini kita mencoba menggunakan gedit
gedit /etc/sysctl.conf 
hapus semua tulisan didalamnya dan kemudian pastekan baris berikut
-------------------------------------------------------------------------------
# IP Spoofing protection
net.ipv4.conf.all.rp_filter = 1
net.ipv4.conf.default.rp_filter = 1

# Ignore ICMP broadcast requests
net.ipv4.icmp_echo_ignore_broadcasts = 1

# Disable source packet routing
net.ipv4.conf.all.accept_source_route = 0
net.ipv6.conf.all.accept_source_route = 0
net.ipv4.conf.default.accept_source_route = 0
net.ipv6.conf.default.accept_source_route = 0

# Ignore send redirects
net.ipv4.conf.all.send_redirects = 0
net.ipv4.conf.default.send_redirects = 0

# Block SYN attacks
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_max_syn_backlog = 2048
net.ipv4.tcp_synack_retries = 2
net.ipv4.tcp_syn_retries = 5

# Log Martians
net.ipv4.conf.all.log_martians = 1
net.ipv4.icmp_ignore_bogus_error_responses = 1

# Ignore ICMP redirects
net.ipv4.conf.all.accept_redirects = 0
net.ipv6.conf.all.accept_redirects = 0
net.ipv4.conf.default.accept_redirects = 0
net.ipv6.conf.default.accept_redirects = 0

# Ignore Directed pings
net.ipv4.icmp_echo_ignore_all = 1
---------------------------------------------------------
3. ketikkan sysctl -p di terminal untuk mengaktifkannya :)

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Harden network with sysctl settings

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Oleh Unknown

Unknown 12/27/2013 Komentar