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系统是RH9.0,是单位的www+DNS+qmail服务器,平常访问量并不是很大,已经用了两年多,一直都还正常,最近系统总是隔几天就没有响应,具体现象是:能ping通, nmap 扫描端口时,能看到端口都开着,有时会显示端口被filtered了.主要的问题就是所有对服务器的请求都没有响应了,http,邮件,以及ssh都没有任何发应. 起器重启后就一切正常.过段时间又会发生同样的问题. 系统日志里没有任何异常的记录. 我已经为这个问题折腾得没有办法了,请大家帮忙分析一下原因. 请版主原谅我要贴比较长的系统日志,以及有关网络连接状态的信息. 以下218.108.**.**为本机的IP地址
出现异常时 nmap 218.108.**.** -P0结果:
[aaa]$ nmap -P0 218.108.**.**
Starting nmap 3.70 ( http://www.insecure.org/nmap/ ) at 2006-07-29 22:11 CST
Interesting ports on 218.108.**.**:
(The 1649 ports scanned but not shown below are in state: closed)
PORT STATE SERVICE
21/tcp open ftp
22/tcp open ssh
25/tcp filtered smtp
53/tcp open domain
80/tcp filtered http
82/tcp open xfer
110/tcp open pop3
135/tcp filtered msrpc
139/tcp filtered netbios-ssn
445/tcp filtered microsoft-ds
3306/tcp open mysql
[aaa]$ nmap -P0 218.108.**.**
Starting nmap 3.70 ( http://www.insecure.org/nmap/ ) at 2006-07-29 22:14 CST
Interesting ports on 218.108.**.**:
(The 1649 ports scanned but not shown below are in state: closed)
PORT STATE SERVICE
21/tcp open ftp
22/tcp open ssh
25/tcp open smtp
53/tcp open domain
80/tcp open http
82/tcp open xfer
110/tcp open pop3
135/tcp filtered msrpc
139/tcp filtered netbios-ssn
445/tcp filtered microsoft-ds
3306/tcp open mysql
Nmap run completed -- 1 IP address (1 host up) scanned in 11.257 seconds
[aaa]$ nmap -P0 218.108.**.**
Starting nmap 3.70 ( http://www.insecure.org/nmap/ ) at 2006-07-29 22:16 CST
Interesting ports on 218.108.**.**:
(The 1649 ports scanned but not shown below are in state: closed)
PORT STATE SERVICE
21/tcp open ftp
22/tcp open ssh
25/tcp open smtp
53/tcp open domain
80/tcp filtered http
82/tcp open xfer
110/tcp open pop3
135/tcp filtered msrpc
139/tcp filtered netbios-ssn
445/tcp filtered microsoft-ds
3306/tcp open mysql
Nmap run completed -- 1 IP address (1 host up) scanned in 11.369 seconds |
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发表于 2006-07-29 22:58
