Psad 无法在 Ubuntu 11.04 上运行

Question

我已经psad在Ubuntu服务器上安装，并设置了相应的iptables规则：

iptables -A INPUT -j LOG
iptables -A FORWARD -j LOG

但是运行时psad --Status，psad 似乎不起作用。查看日志：

[+] Version: psad v2.1.7

[+] Top 50 signature matches:
        [NONE]

[+] Top 25 attackers:
        [NONE]

[+] Top 20 scanned ports:
        [NONE]

[+] iptables log prefix counters:
        [NONE]

    Total packet counters: tcp: 0, udp: 0, icmp: 0

[+] IP Status Detail:
        [NONE]

    Total scan sources: 0
    Total scan destinations: 0

我也收到了这封电子邮件：

[-] You may just need to add a default logging rule to the INPUT chain on
    transportecabo.  For more information, see the file "FW_HELP" in
    the psad sources directory or visit:

    http://www.cipherdyne.org/psad/docs/fwconfig.html

可以看到，iptables 规则没有问题：

$ sudo iptables -L
Chain INPUT (policy ACCEPT)
target     prot opt source               destination         
LOG        all  --  anywhere             anywhere            LOG level warning 

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination         
LOG        all  --  anywhere             anywhere            LOG level warning 

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination       

为什么它没有捕获任何东西？

我将我的全部内容复制psad.conf到 pastebin 上：http://pastebin.com/JQzj9NhB