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AIX Simple Firewall

Prerequisities

Packages to be installed

  • bos.msg.en_US.net.ipsec
  • bos.net.ipsec.keymgt
  • bos.net.ipsec.rte
  • clic.rte.kernext
  • clic.rte.lib

CLI

lslpp -l bos.msg.en_US.net.ipsec

  Fileset                      Level  State      Description
  ----------------------------------------------------------------------------
Path: /usr/lib/objrepos
  bos.msg.en_US.net.ipsec    7.2.5.0  COMMITTED  IP Security Messages - U.S.
                                                 English

Start/Stop IP Security

CLI

# Start command
/usr/sbin/mkdev -c ipsec -t 4
/usr/sbin/mkfilt -v 4 -u -z P

# Stop command
/usr/sbin/rmdev -l ipsec_v4

Smitty

smitty ipsec4 > Start/Stop IP Security > Start IP Security 

  • Start IP Security: [Now and After Reboot]
  • Deny All Non_Secure IP Packets: [no]

Verify command

lsdev -l ipsec_v4

ipsec_v4 Available  IP Version 4 Security Extension

Filter Rules

指令參數：

  • -s : 來源 IP 或網段，例如 192.168.99.1 或 192.168.99.0
  • -m : 來源遮罩，個別 IP 填 255.255.255.255；C 網段 IP 填 255.255.255.0
  • -d : 

Rule #1: 針對 FTP (port 21) 限制指定來源 IP (my-linux-ip) 或網段。

genfilt -v 4 -a P -s <my-linux-ip> -m 0.0.0.0255.255.255.255 -d <my-aix-server-IP> -M 255.255.255.255 -g Y -c tcp -o any -p 0 -O eq -P 21 -r B -w I -l YN -f Y -i all

genfilt -v 4 -a D -s 0.0.0.0 -m 0.0.0.0 -d my_local_IP<aix-server-IP> -M 255.255.255.255 -g Y -c tcp -o any -p 0 -O anyeq -P 21 -r B -w I -l N -f Y -i all

 

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