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</div><div style="text-align:justify;line-height:150%" id="yui_3_16_0_ym19_1_1479233500298_6573"><span style="font-family:"Times New Roman","serif";mso-fareast-font-family:"Times New Roman";mso-fareast-language:IT" id="yui_3_16_0_ym19_1_1479233500298_6574">La RFC ha definito l'assegnazione degli indirizzi IP
per le reti private. Ai fini </span><span style="font-family:"Times New Roman","serif"" id="yui_3_16_0_ym19_1_1479233500298_6575">di
questo documento, un'impresa è definita un'entità che aziona autonomamente una
rete che usa TCP/IP . La crescita esponenziale della Rete è tale, da
determinare la preoccupazione che <span style="background:#EFEFEF" id="yui_3_16_0_ym19_1_1479233500298_6576">lo spazio di
indirizzo globale unico, possa esaurirsi. </span><span style="mso-spacerun:yes" id="yui_3_16_0_ym19_1_1479233500298_6577"> </span>Gli host all'interno delle imprese che
utilizzano IP si distinguono in tre <span style="mso-spacerun:yes" id="yui_3_16_0_ym19_1_1479233500298_6578"> </span>Categorie:</span></div>
<div style="margin-bottom:0cm;margin-bottom:.0001pt;text-align:justify;line-height:150%;tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt" id="yui_3_16_0_ym19_1_1479233500298_6579"><span style="font-family:"Times New Roman","serif"" id="yui_3_16_0_ym19_1_1479233500298_6580">-Categoria 1: gli host che non
richiedono l'accesso agli host di altri<span style="mso-spacerun:yes" id="yui_3_16_0_ym19_1_1479233500298_6581">
</span>imprese o Internet in generale; Gli host di questa categoria
possono<span style="mso-spacerun:yes" id="yui_3_16_0_ym19_1_1479233500298_6582"> </span>utilizzare gli indirizzi IP che
sono univoci all'interno di un'azienda, ma possono essere ambigui ( non
definibili)<span style="mso-spacerun:yes" id="yui_3_16_0_ym19_1_1479233500298_6583"> </span>tra imprese.</span></div>
<div style="margin-bottom:0cm;margin-bottom:.0001pt;text-align:justify;line-height:150%;tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt" id="yui_3_16_0_ym19_1_1479233500298_6584"><span style="font-family:"Times New Roman","serif"" id="yui_3_16_0_ym19_1_1479233500298_6585">-Categoria 2: gli host che hanno
bisogno di accedere ad una serie limitata di servizi esterni (ad esempio,
E-mail, FTP, netnews, accesso remoto) che possono essere gestiti da gateway di
mediazione (ad esempio, gateway a livello di applicazione).</span></div>
<div style="text-align:justify;line-height:150%" id="yui_3_16_0_ym19_1_1479233500298_6586"><span style="font-family:"Times New Roman","serif"" id="yui_3_16_0_ym19_1_1479233500298_6587">-Categoria 3: host che hanno
bisogno di accedere a livello di rete al di fuori dell’impresa impresa (fornito
tramite connettività IP); host che<span style="mso-spacerun:yes" id="yui_3_16_0_ym19_1_1479233500298_6588">
</span>richiedono indirizzi IP globalmente univoca. </span><span style="font-family:"Times New Roman","serif";mso-fareast-font-family:"Times New Roman";mso-fareast-language:IT" id="yui_3_16_0_ym19_1_1479233500298_6589">Gli hosts che fanno parte delle prime due Categorie,
si definiscono "privati", mentre sono "pubblici" gli hosts
che fanno parte della terza. IANA ha riservato 3 blocchi di indirizzi IP, per
le reti private:</span></div>
<pre style="text-align:justify;line-height:150%" id="yui_3_16_0_ym19_1_1479233500298_6590"><span style="font-size:11.0pt;line-height:150%;font-family:"Times New Roman","serif"" id="yui_3_16_0_ym19_1_1479233500298_6591"><span style="mso-spacerun:yes" id="yui_3_16_0_ym19_1_1479233500298_6592"> </span>10.0.0.0<span style="mso-spacerun:yes" id="yui_3_16_0_ym19_1_1479233500298_6593"> </span>-<span style="mso-spacerun:yes" id="yui_3_16_0_ym19_1_1479233500298_6594"> </span>10.255.255.255<span style="mso-spacerun:yes" id="yui_3_16_0_ym19_1_1479233500298_6595"> </span>(10/8 prefix)</span></pre><pre style="text-align:justify;line-height:150%" id="yui_3_16_0_ym19_1_1479233500298_6596"><span style="font-size:11.0pt;line-height:150%;font-family:"Times New Roman","serif"" id="yui_3_16_0_ym19_1_1479233500298_6597"><span style="mso-spacerun:yes" id="yui_3_16_0_ym19_1_1479233500298_6598"> </span>172.16.0.0<span style="mso-spacerun:yes" id="yui_3_16_0_ym19_1_1479233500298_6599"> </span>-<span style="mso-spacerun:yes" id="yui_3_16_0_ym19_1_1479233500298_6600"> </span>172.31.255.255<span style="mso-spacerun:yes" id="yui_3_16_0_ym19_1_1479233500298_6601"> </span>(172.16/12 prefix)</span></pre><pre style="text-align:justify;line-height:150%" id="yui_3_16_0_ym19_1_1479233500298_6602"><span style="font-size:11.0pt;line-height:150%;font-family:"Times New Roman","serif"" id="yui_3_16_0_ym19_1_1479233500298_6603"><span style="mso-spacerun:yes" id="yui_3_16_0_ym19_1_1479233500298_6604"> </span>192.168.0.0<span style="mso-spacerun:yes" id="yui_3_16_0_ym19_1_1479233500298_6605"> </span>-<span style="mso-spacerun:yes" id="yui_3_16_0_ym19_1_1479233500298_6606"> </span>192.168.255.255 (192.168/16 prefix)</span></pre>
<div style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:150%" id="yui_3_16_0_ym19_1_1479233500298_6607"><span style="font-family:"Times New Roman","serif"" id="yui_3_16_0_ym19_1_1479233500298_6608">Si fa riferimento al
primo blocco come "block 24-bit", il secondo come "Blocco
20-bit", e al terzo come blocco "16-bit". Si raccomanda
vivamente che i router che collegano le imprese a reti esterne, siano istituiti
con pacchetti d’instradamento appropriati e con filtri ad entrambe le estremità
del collegamento per prevenire la perdita d’informazioni.</span></div>
<div id="yui_3_16_0_ym19_1_1479233500298_6465"> </div><div class="signature" id="yui_3_16_0_ym19_1_1479233500298_6467"><div id="yui_3_16_0_ym19_1_1479233500298_6466"><div id="yui_3_16_0_ym19_1_1479233500298_6639">Cordiali Saluti</div><div>Luigino Pignoloni<br></div></div><br></div> <div class="qtdSeparateBR"><br><br></div><div class="yahoo_quoted" style="display: block;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div dir="ltr"><font face="Arial" size="2"> Il Sabato 12 Novembre 2016 13:52, Antonio Prado via Internet-e-architetture-di-rete <internet-e-architetture-di-rete@list.informagiovani.comunesbt.it> ha scritto:<br></font></div> <br><br> <div class="y_msg_container">ciao,<br><br>invito gli allievi alla scrupolosa lettura di RFC 1918 e a inviare qui<br>in lista un proprio sunto in italiano, massimo 10 righe<br><br>grazie<br>--<br>antonio<br><br>_______________________________________________<br>Internet-e-architetture-di-rete mailing list<br><a ymailto="mailto:Internet-e-architetture-di-rete@list.informagiovani.comunesbt.it" href="mailto:Internet-e-architetture-di-rete@list.informagiovani.comunesbt.it">Internet-e-architetture-di-rete@list.informagiovani.comunesbt.it</a><br><a href="http://list.informagiovani.comunesbt.it/mailman/listinfo/internet-e-architetture-di-rete" target="_blank">http://list.informagiovani.comunesbt.it/mailman/listinfo/internet-e-architetture-di-rete</a><br><br><br></div> </div> </div> </div></div></body></html>