<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div apple-content-edited="true" class=""><div style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><br class=""></div>
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<div><span style="font-size: medium; widows: 1; background-color: rgb(255, 255, 255);" class=""><i class="">$ ifconfig -a</i></span></div><div class=""><pre style="font-size: medium; widows: 1; background-color: rgb(255, 255, 255);" class=""><code class=""><i class="">lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
options=3<RXCSUM,TXCSUM>
inet6 fe80::1%lo0 <font color="#e32400" class="">prefixlen 64</font> scopeid 0x1
inet 127.0.0.1 netmask 0xff000000
inet6 ::1 prefixlen 128 </i></code></pre><pre style="widows: 1; background-color: rgb(255, 255, 255);" class=""><code class=""><pre style="font-size: medium;" class=""><code class=""><i class="">$ ifconfig -a | ifcfg-data -n
0xff000000
0xffffff00</i></code></pre><div style="font-size: medium;" class=""><br class=""></div><div style="font-size: medium;" class="">Hi professor,</div><div style="font-size: medium;" class=""><br class=""></div><div style="font-size: medium;" class="">“prefixlen 64” is also a net mask, but you don’t output it in your example.</div><div style="font-size: medium;" class=""><br class=""></div><div style="font-size: medium;" class="">Is that ok if I output “64”.</div></code></pre><div class=""><div class=""><blockquote type="cite" class="">How about this cases: <br class=""><br class="">inet6 ::1/128<br class=""><br class="">Should "ifconfig -a | ifcfg-data -n? output ?/128? ?<br class=""></blockquote><br class="">That would be reasonable.</div><div class=""><br class=""></div><div class="">Best Regards,</div><div class=""><br class=""></div><div class="">Xiakun Lu</div></div></div></body></html>