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Special Forums IP Networking How does a router directs the internet traffic to a specific host in the private network? Post 302610535 by Corona688 on Wednesday 21st of March 2012 11:14:43 AM
Old 03-21-2012
Each end of the connection has its own port. You're connecting to port 80 on google, but your own port is going to be a random number >32768. Let's call it 40,000.

So your PC transmits a connection request to google.com on port 80, from 192.168.134.100 port 40,000. It travels through your router, which marks down "forward traffic to port 40,000 to 192.168.134.100". It will continue forwarding this connection until it's explicitly broken, or the connection lies idle a few minutes (a highly annoying fact sometimes when you don't want idle connections to break!) This process is part of Network Address Translation(NAT).

These local port numbers are randomly picked, allowing many connections to coexist alongside each other without their ports overlapping.
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MEMCACHE.CONNECT(3)							 1						       MEMCACHE.CONNECT(3)

Memcache::connect - Open memcached server connection

SYNOPSIS
bool Memcache::connect (string $host, [int $port], [int $timeout]) DESCRIPTION
Memcache.connect(3) establishes a connection to the memcached server. The connection, which was opened using Memcache.connect(3) will be automatically closed at the end of script execution. Also you can close it with Memcache.close(3). Also you can use memcache_connect(3) function. PARAMETERS
o $host - Point to the host where memcached is listening for connections. This parameter may also specify other transports like unix:///path/to/memcached.sock to use UNIX domain sockets, in this case $port must also be set to 0. o $port - Point to the port where memcached is listening for connections. Set this parameter to 0 when using UNIX domain sockets. Please note: $port defaults to memcache.default_port if not specified. For this reason it is wise to specify the port explicitly in this method call. o $timeout - Value in seconds which will be used for connecting to the daemon. Think twice before changing the default value of 1 second - you can lose all the advantages of caching if your connection is too slow. NOTES
Warning When the $port is unspecified, this method defaults to the value set of the PHP ini directive memcache.default_port If this value was changed elsewhere in your application it might lead to unexpected results: for this reason it is wise to always specify the port explicitly in this method call. RETURN VALUES
Returns TRUE on success or FALSE on failure. EXAMPLES
Example #1 Memcache.connect(3) example <?php /* procedural API */ $memcache_obj = memcache_connect('memcache_host', 11211); /* OO API */ $memcache = new Memcache; $memcache->connect('memcache_host', 11211); ?> SEE ALSO
Memcache.pconnect(3), Memcache.close(3). PHP Documentation Group MEMCACHE.CONNECT(3)
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