ipchains

1
ipchains

• Onno W. Purbo
• Onno_at_indo.net.id

2
ipchains
3
Pengenalan ipchains

• input
• output
• forward
• user defined

4
Kriteria ipchains

• ACCEPT - terima paket
• DENY - tolak paket tanpa pesan
• REJECT - tolak paket dg pesan
• MASQ - bungkus paket
• REDIRECT - arahkan paket
• RETURN - arahkan paket

5
Manual ipchains

• man ipchains
• info ipchains

6
Check default setting ipchains

• ipchains L
• Chain input (policy ACCEPT)
• Chain forward (policy ACCEPT)
• Chain output (policy ACCEPT)

7
Contoh kasus ipchains

• WARNET 192.168.0.x
• Menolak paket 192.168.0.6 ke port telnet

8
WARNET 192.168.0.x

• ipchains P forward DENY
• ipchains A forward
• s 192.168.0.0/24 j MASQ

9
Tolak 192.168.0.6 ke telnet

• ipchains A input p tcp -destination port 23
  s 192.168.0.6/32 j DENY