新裝的centos6.3+db29.7，數(shù)據(jù)庫導(dǎo)入完了的之后用Toad連接訪問之的時候出錯了。

DB2 Database Error: ERROR [08001] [IBM] SQL30081N A communication error has been detected. Communication protocol being used: "TCP/IP". Communication API being used: "SOCKETS". Location where the error was detected: "10.20.51.155". Communication function detecting the error: "selectForConnectTimeout". Protocol specific error code(s): "0", "*", "*". SQLSTATE=08001 (Remembered answer: "OK". Enable)

查了好久，網(wǎng)上給了各種解釋，其中有個人提到了可能與防火墻有關(guān)。

一開始我的做法很黃，就是把防火墻關(guān)了，連接下就能連上了。

$ service iptables stop

現(xiàn)在覺得需要添加規(guī)則，研究了下iptables相關(guān)命令。得出

[root@localhost ~]# iptables -A INPUT -m state --state NEW -m tcp -p tcp --dport 50000 -j ACCEPT

[root@localhost ~]# /etc/rc.d/init.d/iptables save

iptables: Saving firewall rules to /etc/sysconfig/iptables:[ OK ]

[root@localhost ~]# service iptables restart

iptables: Flushing firewall rules: [ OK ]

iptables: Setting chains to policy ACCEPT: filter [ OK ]

iptables: Unloading modules: [ OK ]

iptables: Applying firewall rules: [ OK ]

再次嘗試用客戶端連接，依然報錯。查看下：

[root@localhost ~]# service iptables status

Table: filter

Chain INPUT (policy ACCEPT)

num target prot opt source destination

1 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED

2 ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0

3 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0

4 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:22

5 REJECT all -- 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited

6 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:50000

Chain FORWARD (policy ACCEPT)

num target prot opt source destination

1 REJECT all -- 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited

Chain OUTPUT (policy ACCEPT)

num target prot opt source destination

原因猜測是優(yōu)先順序問題，在我們新規(guī)則之前有一個reject all，他禁止了對地發(fā)包的訪問。

查詢了下對應(yīng)方法，發(fā)現(xiàn)我參數(shù) iptables -A INPUT -m state --state NEW -m tcp -p tcp --dport 50000 -j ACCEPT

改成 iptables -I INPUT -m state --state NEW -m tcp -p tcp --dport 50000 -j ACCEPT，應(yīng)該可以實現(xiàn)

*-A是插入規(guī)則到末尾，-I是插入到頂部

把剛剛的規(guī)則刪除：

[root@localhost ~]# iptables -D INPUT 6

[root@localhost ~]# service iptables status

Table: filter

Chain INPUT (policy ACCEPT)

num target prot opt source destination

1 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED

2 ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0

3 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0

4 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:22

5 REJECT all -- 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited

Chain FORWARD (policy ACCEPT)

num target prot opt source destination

1 REJECT all -- 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited

Chain OUTPUT (policy ACCEPT)

num target prot opt source destination

刪除成功，從新追加：

[root@localhost ~]# iptables -I INPUT -m state --state NEW -m tcp -p tcp --dport 50000 -j ACCEPT

[root@localhost ~]# service iptables status

Table: filter

Chain INPUT (policy ACCEPT)

num target prot opt source destination

1 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:50000

2 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED

3 ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0

4 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0

5 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:22

6 REJECT all -- 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited

Chain FORWARD (policy ACCEPT)

num target prot opt source destination

1 REJECT all -- 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited

Chain OUTPUT (policy ACCEPT)

num target prot opt source destination

再次嘗試連接，OK連上了。

這個時候要記得保存剛剛的更改。不然下次service iptables restart事件發(fā)生的話，那么此次設(shè)置無效，連接失敗。

[root@localhost ~]# /etc/rc.d/init.d/iptables save

iptables: Saving firewall rules to /etc/sysconfig/iptables:[ OK ]

[root@localhost ~]# service iptables restart

iptables: Flushing firewall rules: [ OK ]

iptables: Setting chains to policy ACCEPT: filter [ OK ]

iptables: Unloading modules: [ OK ]

iptables: Applying firewall rules: [ OK ]

[root@localhost ~]# service iptables status

Table: filter

Chain INPUT (policy ACCEPT)

num target prot opt source destination

1 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:50000

2 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED

3 ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0

4 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0

5 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:22

6 REJECT all -- 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited

Chain FORWARD (policy ACCEPT)

num target prot opt source destination

1 REJECT all -- 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited

Chain OUTPUT (policy ACCEPT)

num target prot opt source destination

到此結(jié)束。

總結(jié)

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