<p><b>@multun</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/ipxe/ipxe/pull/67#discussion_r185137488">src/net/ipv4.c</a>:</p>
<pre style='color:#555'>> +            sprintf(buf, "255.255.255.%d", n_octet);
+               addr_len = 4;
+       } else if (cidr > 16) {
+               sprintf(buf, "255.255.%d.0", n_octet);
+               addr_len = 3;
+       } else if (cidr > 8) {
+               sprintf(buf, "255.%d.0.0", n_octet);
+               addr_len = 2;
+       } else if (cidr > 0) {
+               sprintf(buf, "%d.0.0.0", n_octet);
+               addr_len = 1;
+       } else if (cidr == 0) {
+               sprintf(buf, "0.0.0.0");
+               addr_len = 0;
+       } else {
+               DBGC(cidr, "Unknown netmask descriptor /%d.\n", cidr);
</pre>
<p>I don't quite get what's the point of having an individual format string for each full byte. Isn't converting it to a netmask already sufficient ?</p>
<div class="highlight highlight-source-python"><pre><span class="pl-k">def</span> <span class="pl-en">cidr_to_netmask</span>(<span class="pl-smi">cidr</span>):
     <span class="pl-k">return</span> <span class="pl-c1">tuple</span>(<span class="pl-c1"><span class="pl-k">0x</span>FF</span> <span class="pl-k">&</span> <span class="pl-k">~</span>((<span class="pl-c1">1</span> <span class="pl-k"><<</span> (<span class="pl-c1">8</span> <span class="pl-k">-</span> <span class="pl-c1">min</span>(<span class="pl-c1">8</span>, cidr <span class="pl-k">-</span> i <span class="pl-k">*</span> <span class="pl-c1">8</span>))) <span class="pl-k">-</span> <span class="pl-c1">1</span>) <span class="pl-k">for</span> i <span class="pl-k">in</span> <span class="pl-c1">range</span>(<span class="pl-c1">4</span>))</pre></div>

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