烟酒一下squid这个东西

晚上闲来无事，和一个朋友研究起squid，环境kubuntu 5.10，通过路由映射打开22和3128端口，安装了ssh，还apt-get install了squid，但是nmap中始终没有3128端口的身影，只有22在那里。

chen@ubuntu:~$ sudo /etc/init.d/squid start
Password:
Starting proxy server: squid.

chen@ubuntu:~$ ps -e x | grep squid
 8152 pts/1    S+     0:00 grep squid

chen@ubuntu:~$ nmap 192.168.0.3

Starting nmap 3.81 ( http://www.insecure.org/nmap/ ) at 2006-03-03 22:50 CET
Interesting ports on 192.168.0.3:
(The 1662 ports scanned but not shown below are in state: closed)
PORT   STATE SERVICE
22/tcp open  ssh

Nmap finished: 1 IP address (1 host up) scanned in 0.464 seconds
chen@ubuntu:~$

不知道为什么始终是访问失败。请高手亲临指点