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2022-04-01 12:16:46 +02:00
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<section id="legal-interception-li">
<span id="li"></span><h1>Legal Interception (LI)<a class="headerlink" href="#legal-interception-li" title="Permalink to this headline"></a></h1>
<p>The BNG Blaster can be used to emulate a mediation device providing detailed statistics
about the received flows. Today only the BCM QMX LI header format is supported but further
headers can be easily integrated.</p>
<p><em>BCM QMX LI Header Format</em></p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| D | PT | SPT | LIID |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
</pre></div>
</div>
<p>The functionality is automatically enabled on the network interface
and works combined with sessions in one instance or as standalone
mediation device as shown in the following example.</p>
<div class="highlight-json notranslate"><div class="highlight"><pre><span></span><span class="p">{</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;interfaces&quot;</span><span class="p">:</span><span class="w"> </span><span class="p">{</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;tx-interval&quot;</span><span class="p">:</span><span class="w"> </span><span class="mi">10</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;rx-interval&quot;</span><span class="p">:</span><span class="w"> </span><span class="mi">1</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;network&quot;</span><span class="p">:</span><span class="w"> </span><span class="p">{</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;interface&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;eth2&quot;</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;address&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;100.0.0.10/24&quot;</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;gateway&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;100.0.0.2&quot;</span><span class="w"></span>
<span class="w"> </span><span class="p">}</span><span class="w"></span>
<span class="w"> </span><span class="p">}</span><span class="w"></span>
<span class="p">}</span><span class="w"></span>
</pre></div>
</div>
<p>The received flows can be displayed with the command <cite>li-flows</cite>.</p>
<p><code class="docutils literal notranslate"><span class="pre">$</span> <span class="pre">sudo</span> <span class="pre">bngblaster-cli</span> <span class="pre">run.sock</span> <span class="pre">li-flows</span></code></p>
<div class="highlight-json notranslate"><div class="highlight"><pre><span></span><span class="p">{</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;status&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;ok&quot;</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;code&quot;</span><span class="p">:</span><span class="w"> </span><span class="mi">200</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;li-flows&quot;</span><span class="p">:</span><span class="w"> </span><span class="p">[</span><span class="w"></span>
<span class="w"> </span><span class="p">{</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;source-address&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;1.1.1.1&quot;</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;source-port&quot;</span><span class="p">:</span><span class="w"> </span><span class="mi">49152</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;destination-address&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;1.1.1.2&quot;</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;destination-port&quot;</span><span class="p">:</span><span class="w"> </span><span class="mi">49152</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;direction&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;downstream&quot;</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;packet-type&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;ethernet&quot;</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;sub-packet-type&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;double-tagged&quot;</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;liid&quot;</span><span class="p">:</span><span class="w"> </span><span class="mi">4194301</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;bytes-rx&quot;</span><span class="p">:</span><span class="w"> </span><span class="mi">94</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;packets-rx&quot;</span><span class="p">:</span><span class="w"> </span><span class="mi">1</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;packets-rx-ipv4&quot;</span><span class="p">:</span><span class="w"> </span><span class="mi">0</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;packets-rx-ipv4-tcp&quot;</span><span class="p">:</span><span class="w"> </span><span class="mi">0</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;packets-rx-ipv4-udp&quot;</span><span class="p">:</span><span class="w"> </span><span class="mi">0</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;packets-rx-ipv4-host-internal&quot;</span><span class="p">:</span><span class="w"> </span><span class="mi">0</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;packets-rx-ipv6&quot;</span><span class="p">:</span><span class="w"> </span><span class="mi">0</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;packets-rx-ipv6-tcp&quot;</span><span class="p">:</span><span class="w"> </span><span class="mi">0</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;packets-rx-ipv6-udp&quot;</span><span class="p">:</span><span class="w"> </span><span class="mi">0</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;packets-rx-ipv6-host-internal&quot;</span><span class="p">:</span><span class="w"> </span><span class="mi">0</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;packets-rx-ipv6-no-next-header&quot;</span><span class="p">:</span><span class="w"> </span><span class="mi">0</span><span class="w"></span>
<span class="w"> </span><span class="p">},</span><span class="w"></span>
<span class="w"> </span><span class="p">{</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;source-address&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;1.1.1.1&quot;</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;source-port&quot;</span><span class="p">:</span><span class="w"> </span><span class="mi">49152</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;destination-address&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;1.1.1.2&quot;</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;destination-port&quot;</span><span class="p">:</span><span class="w"> </span><span class="mi">49152</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;direction&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;upstream&quot;</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;packet-type&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;ethernet&quot;</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;sub-packet-type&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;double-tagged&quot;</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;liid&quot;</span><span class="p">:</span><span class="w"> </span><span class="mi">4194301</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;bytes-rx&quot;</span><span class="p">:</span><span class="w"> </span><span class="mi">160720</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;packets-rx&quot;</span><span class="p">:</span><span class="w"> </span><span class="mi">820</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;packets-rx-ipv4&quot;</span><span class="p">:</span><span class="w"> </span><span class="mi">820</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;packets-rx-ipv4-tcp&quot;</span><span class="p">:</span><span class="w"> </span><span class="mi">0</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;packets-rx-ipv4-udp&quot;</span><span class="p">:</span><span class="w"> </span><span class="mi">0</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;packets-rx-ipv4-host-internal&quot;</span><span class="p">:</span><span class="w"> </span><span class="mi">820</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;packets-rx-ipv6&quot;</span><span class="p">:</span><span class="w"> </span><span class="mi">0</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;packets-rx-ipv6-tcp&quot;</span><span class="p">:</span><span class="w"> </span><span class="mi">0</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;packets-rx-ipv6-udp&quot;</span><span class="p">:</span><span class="w"> </span><span class="mi">0</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;packets-rx-ipv6-host-internal&quot;</span><span class="p">:</span><span class="w"> </span><span class="mi">0</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;packets-rx-ipv6-no-next-header&quot;</span><span class="p">:</span><span class="w"> </span><span class="mi">0</span><span class="w"></span>
<span class="w"> </span><span class="p">}</span><span class="w"></span>
<span class="w"> </span><span class="p">]</span><span class="w"></span>
<span class="p">}</span><span class="w"></span>
</pre></div>
</div>
<p>The <code class="docutils literal notranslate"><span class="pre">packets-rx-ipv4-host-internal</span></code> refers to the IPv4 protocol number 61
(any host internal protocol) which is used by some network testers as default
type for traffic streams. The same is valid for <code class="docutils literal notranslate"><span class="pre">packets-rx-ipv6-host-internal</span></code>
which refers to next header 61 and <code class="docutils literal notranslate"><span class="pre">packets-rx-ipv6-no-next-header</span></code> with next
header 59.</p>
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