| 摘要 |
<P>PROBLEM TO BE SOLVED: To estimate the number of global IPv4 addresses required for an LSN (Large Scale NAT) by using packet trace data. <P>SOLUTION: A packet from a network toward the Internet is captured. A packet group sharing a set of five flow keys äsrcIP, dstIP, srcPort, dstPort, Protocol} is extracted as a flow, and stored in flow storage means. In each äsrcIP#i, dstIP#j} pair, the number of flows in communication at a time point t is defined as N(t, i, j). The N(t, i, j) is counted from packet trace data stored in the flow storage means, and temporarily, as the number of äglobal IPv4 address, port number} required for NAT(Network Address Translation) when an ISP(Internet Service Provider) provides Internet access using the NAT, äglobal IPv4 address, port number} required to be allocated to an internal host i at the time point t is calculated using Nmax(t, i)=max<SB POS="POST">j</SB>N(t, i, j). <P>COPYRIGHT: (C)2012,JPO&INPIT |
