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Full Discussion: stupid IP question
Special Forums IP Networking stupid IP question Post 302072890 by buffoonix on Monday 8th of May 2006 04:03:52 PM
Old 05-08-2006
Your assumption is correct.
Because the number of available Internet routed IP addresses is limited
(at least for the time being until someday IPv6 will take over IPv4)
most ISPs have many, many fewer Internet IP address than customers
they have to provide with.
The same is mostly true for the bandwidth they sell.
They speculate that not all their customers will require Internet access at the
same time (much like a bank has more debters than they could redeem instantly).
Therefore they only posses a limited pool of IP addresses that they
assign dynamically each time a customer requests Internet access.
Because of the limited pool and the great demand it happens regularily that the next client in the queue gets the very same IP address someone else have been holding so far once he quits or gets kicked of (which forcebly happens at least once a day even for DSL clients of many ISPs)
 

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inet_ntop(3)						     Library Functions Manual						      inet_ntop(3)

NAME
inet_ntop - Converts a numeric address to a text string LIBRARY
Standard C Library (libc.so, libc.a) SYNOPSIS
#include <arpa/inet.h> const char *inet_ntop ( int af, const void *src, char *dst, size_t size) ; PARAMETERS
Specifies the address family. Valid values are AF_INET for an Internet Protocol Version 4 (IPv4) address and AF_INET6 for an IPv6 address. Points to a buffer that contains the numeric Internet address. Points to a buffer that is to contain the text string. Specifies the size of the buffer pointed to by the dst parameter. For Internet Protocol Version 4 (IPv4) addresses, the minimum buffer size is 16 octets. For IPv6 addresses, the minimum buffer size is 46 octets. The <netinet/in.h file defines the INET_ADDRSTRLEN and INET6_ADDRSTRLEN constants, respectively, for for these values. DESCRIPTION
The use of this routine is deprecated. Use the getnameinfo(3) routine instead. The inet_ntop() function converts a binary Internet address value to a formatted text string. RETURN VALUES
Upon successful conversion, the inet_ntop() function returns a pointer to the buffer containing the text string. If the function fails, it returns a NULL pointer. ERRORS
If the inet_ntop() routine call fails, errno is set to one of the following values: The address family specified in af parameter is invalid. The size of the buffer is inadequate. RELATED INFORMATION
Functions: getnamerinfo(3), inet_pton(3). delim off inet_ntop(3)
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