【转】 让Oracle10g数据库服务通过防火墙
在项目实施中，发现数据库安装时测试一切正常，但当客户端连接服务器时却总是超时，经检查配置没有发现可能的错误，然后我想到了防火墙，当打开1521端 口后，连接操作仍然失败。我又怀疑网络有问题，用telnet server_ip:1521尝试，连接被接受，说明1521端口已经被打开。
没有办法，查询Oracle资料后才明白，network listener
只起一个中介作用，当客户连接它时，它根据配置寻找到相应的数据库实例进程，然后spawned一个新的数据库连接，这个连接端口由network
listener传递给客户机，此后客户机就不再和打交道了，即使listener停止了工作。这个新的连接端口是不可预知的，因而会被防火墙阻止。
Windows Socket2 规范有一个新的特性，就是Shared Socket， 所谓共享套接字是指一个进程共享另一个进程的套接字(详见MSDN相关参考）。如果让network listener与数据库服务进程共享套接字，那么连接端口就不会变化。
如何设置 Shared Socket?
在注册表：HKEY_LOCAL_MACHINE\SOFTWARE\ORACLE\HOME0上新建一个字符串
值：USE_SHARED_SOCKET=true。如果安装了多个目录，则每个类似的目录都要设
置：HKEY_LOCAL_MACHINE\SOFTWARE\ORACLE\HOMEx (x目录编号）
设置后要求重新启动实例（只重启listener发现没有效果）
引用资料：
http://www.computer-book-authors.org/aud_450.htm
典型问题：
http://www.lazydba.com/oracle/0__37815.html
when a client connects to a listener it uses port 1521 at the client
machine. the listener then returns to the client thru a different port.
The 1521 port is closed and the db connection uses the new port for
communicating with the client. i want the listener to return to the
client using port 1521, how?
metalink says use the use_shared_socket parameter, but its still not
working. i set the parameter to true in the sys env and in the registry.
....
Oracle 原文：
USE_SHARED_SOCKET
You can set the USE_SHARED_SOCKET parameter to TRUE to enable the use of
shared sockets. If this parameter is set to TRUE, the network listener
passes the socket descriptor for client connections to the database
thread. As a result, the client does not need to establish a new
connection to the database thread and database connection time improves.
Also, all database connections share the port number used by the
network listener, which can be useful if you are setting up third-party
proxy servers.
On Windows NT 4.0 Service Pack3 or earlier, enabling this option
precludes bringing the network listener up or down in a case where a
database connection spawned by the network listener is active.
Therefore, you may
need to shut down all of the databases serviced by a network listener
before you can bring down and restart a network listener. This results
from the way shared sockets have been implemented in WINSOCK2. WINSOCK2
does not
allow a reliable thread to a network listener on any port on which other
connections are also active. This is not an issue on Windows NT 4.0
Service Pack 4 orlater. Oracle recommends that you upgrade to Windows NT
4.0 Service Pack 4 if you intend to set this parameter.
This parameter only works in dedicated server mode in a TCP/IP
environment. If this parameter is set, you cannot use the 8.1.5 listener
to spawn Oracle 7.x databases. To spawn an Oracle 8.0.x database from
an 8.1.5 listener
==============
资料
Oracle客户端连接服务器，首先去找1521监听端口，服务器的1521监听端口再向server process进程发出请求，并返回一个随机端口，返回给客户端，客户端再来连接这个端口。 这样就给服务器上的防火墙设置带来了麻烦，这个端口是随机的，如何开放?
windows 平台上的这个问题成了一大难题，很多论坛都有人问，但很少有人能解决。 unix平台不用担心，系统自动会解决这个问题.
windows 平台上的这个问题成了一大难题，很多论坛都有人问，但很少有人能解决。 unix平台不用担心，系统自动会解决这个问题.
Matalink上提供了三种解决办法，实际上USE_SHARED_SOCKET
是最有效最方便的。但经过无数次实现，仍然没有成功，最后终于发现是Oracle 8.1.7的bug 需要打补丁，升级到Oracle
8.1.7.1.2
需要在MTS模式下（共享模式）
需要在MTS模式下（共享模式） Oracle默认是专用模式。
经试验发现，如果不在init文件中设参数的话，Oracle仍然会要求一个随机端口和1521端口来共同通讯，只是这个随机端口，并不随客户端会话和登录的变化而变化，在没有重启服务器时，是固定的。
经试验发现，如果不在init文件中设参数的话，Oracle仍然会要求一个随机端口和1521端口来共同通讯，只是这个随机端口，并不随客户端会话和登
录的变化而变化，在没有重启服务器时，是固定的。 （试验发现，在专用模式下，每次连接，oracle服务器会按+1方式，提供一个非1521的端口。）
所以，还需要在init.ora文件的最后加上一条参数：
mts_dispatchers="(address=(protocol=tcp)(host=myoradb)(port=1521))(dispatchers=1)"这样才真正实现只用一个端口，穿过防火墙。
这样才真正实现只用一个端口，穿过防火墙。 参考资料:
Oracle uses dynamic ports under windows NT because of a bug in windows,
so oracle can't use shared sockets. This bug got fixed with service pack
3 I think. By default, oracle uses the dynamic ports without caring
which service pack is installed. There is a registry setting to force
oracle to use shared sockets. The parameter is (what a surprise!)
USE_SHARED_SOCKET in LOCAL_MACHINESoftwareOracleHomeX where X is your
desired homedir. This parameter should be set to TRUE. There's a
whitepaper from oracle for this too, somewhere on their site. Anyway,
this parameter doesnt work for 8.1.7 Some users reported that it worked
with 8.1.6.3, but 8.1.7 termiates every conection immediately...
Oracle uses dynamic ports under windows NT because of a bug in windows,
so oracle can't use shared sockets. This bug got fixed with service pack
3 I think. By default, oracle uses the dynamic ports without caring
which service pack is installed. There is a registry setting to force
oracle to use shared sockets. The parameter is (what a surprise!)
USE_SHARED_SOCKET in LOCAL_MACHINESoftwareOracleHomeX where X is your
desired homedir. This parameter should be set to TRUE. There's a
whitepaper from oracle for this too, somewhere on their site. Anyway,
this parameter doesnt work for 8.1.7 Some users reported that it worked
with 8.1.6.3, but 8.1.7 termiates every conection immediately...
Contributed by Arne Brutschy (abrutschy@xylon.de) on July 5, 2001.
Actually, I want to establish a replication system in my local machine..
for replicating objects(tables) from remote database to a local
database... what data security option i must take in to account. I
request you to give me the detail description like which protocal must
be used and what parameter must be set in init.ora file,sqlnet.ora and
listener.ora file and what other steps to be taken... I would be very
thankful to you ... if you kindly describe the things...actually i want
to maintain the data privacy which happens between remote and local
database while replication take place.. any one can trap the net and
extract the data ... so i need to stop that.
Actually, I want to establish a replication system in my local machine..
for replicating objects(tables) from remote database to a local
database... what data security option i must take in to account. I
request you to give me the detail description like which protocal must
be used and what parameter must be set in init.ora file,sqlnet.ora and
listener.ora file and what other steps to be taken... I would be very
thankful to you ... if you kindly describe the things...actually i want
to maintain the data privacy which happens between remote and local
database while replication take place.. any one can trap the net and
extract the data ... so i need to stop that. I would be very thankful to
you ... this is a request.. please mail me on the address p_v_raju73@rediffmail.com.
regards p.v.raju
regards p.v.raju Contributed by pvraju (p_v_raju73@rediffmail.com) on October 8, 2001.
Modify Windows registry.
USE_SHARED_SOCKET = TRUE
Modify Windows registry.
USE_SHARED_SOCKET = TRUE - Oracle 8.1.6 for NT/2k HKEY_LOCAL_MACHINESOFTWAREORACLEHOME<#> (# is your desired homedir)
- Oracle 8.1.7.0.0 for NT/2k Doesn't work in Oracle 8.1.7.0.0 for NT/2k
- Oracle 8.1.7.1.2 for NT/2k HKEY_LOCAL_MACHINESOFTWAREORACLE
- FAQ Site
http://www.orafaq.net/archive/co ... 02/04/13/143024.htm
http://www.orafaq.net/archive/co ... 02/04/13/143024.htm
http://www.pauck.de/marco/misc/oracle_and_firewalls.html
- FAQ Site
http://www.orafaq.net/archive/co ... 02/04/13/143024.htm
http://www.orafaq.net/archive/co ... 02/04/13/143024.htm
http://www.pauck.de/marco/misc/oracle_and_firewalls.html
