Networking in Software

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Networking
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It also possible to bring this interface back up by using ifconfig:
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# ifconfig hme1 up # ifconfig hme1 hme1: flags=863<UP,BROADCAST,NOTRAILERS,RUNNING,MULTICAST> mtu 1500 inet 204.17.64.16 netmask ffffff00 broadcast 204.17.64.255
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To ensure that this configuration is preserved from boot to boot, it is possible to edit the networking startup file /etc/rc2.d/S69inet and add this line to any others that configure the network interfaces. It may be necessary to set several of these parameters in a production environment to ensure optimal performance, especially when application servers and Web servers are in use. For example, when a Web server makes a request to port 80 using TCP, a connection is opened and closed. However, the connection is kept open for a default time of two minutes to ensure that all packets are correctly received. For a system with a large number of clients, this can lead to a bottleneck of stale TCP connections, which can significantly impact the performance of the Web server. Fortunately, the parameter that controls this behavior (tcp_close_wait_interval) can be set using ndd to something more sensible (like 30 seconds):
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# ndd -set /dev/tcp tcp_close_wait_interval 30000
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To ensure that this configuration is preserved from boot to boot, it is possible to edit the networking startup file, /etc/rc2.d/S69inet, and add this line to any others that configure the network interfaces. You should be aware that altering ndd parameters will affect all TCP services, so while a Web server might perform optimally with tcp_close_wait_interval equal to 30 seconds, a database listener that handles large datasets may require a much wider time window. The best way to determine optimal values is to perform experiments with low, moderate, and peak levels of traffic for both the Web server and the database listener, to determine a value that will provide reasonable performance for both applications. It is also important to check SunSolve for the latest patches and updates for recently discovered kernel bugs.
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The following examples show how to configure Solaris networking.
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Configuring inetd
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Services for inetd are defined in /etc/inetd.conf. Every time you make a change to inetd.conf, you need to send a HUP signal to the inetd process. You can identify the process ID (PID) of inetd by using the ps command and then sending a kill SIGHUP
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21:
Basic Networking
signal to that PID from the shell. In addition, commenting an entry in the /etc/services file will not necessarily prevent a service from running: strictly speaking, only services that make the getprotobyname() call to retrieve their port number require the /etc/ services file. So, for applications like talk, removing their entry in /etc/services has no effect. To prevent the talk daemon from running, you would need to comment out its entry in /etc/inetd.conf and send a SIGHUP to the inetd process. A service definition in /etc/inetd.conf has the following format:
service socket protocol flags user server_name arguments
where the service uses either datagrams or streams, and uses UDP or TCP on the transport layer, with the server_name being executed by the user. An example entry is the UDP talk service:
talk dgram udp wait root /usr/sbin/in.talkd in.talkd
The talk service uses datagrams over UDP and is executed by the root user, with the talk daemon being physically located in /usr/sbin/in.talkd. Once the talk daemon is running through inetd, it is used for interactive screen-based communication between two users (with at least one user talking on the local system). To prevent users from using (or abusing) the talk facility, you would need to comment out the definition for the talk daemon in the /etc/inetd.conf file. Thus, the line shown earlier would be changed to this:
#talk dgram udp wait root /usr/sbin/in.talkd in.talkd
In order for inetd to register the change, it needs to be restarted by using the kill command. To identify the PID for inetd, the following command may be used:
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