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<li class="toctree-l2"><a class="reference internal" href="#enable-forwarding">Enable forwarding</a></li>
<li class="toctree-l2"><a class="reference internal" href="#mtu">MTU</a></li>
<li class="toctree-l2"><a class="reference internal" href="#increase-arp-cache-size">Increase ARP cache size</a></li>
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<section id="recommendations">
<h1>Recommendations<a class="headerlink" href="#recommendations" title="Link to this heading"></a></h1>
<section id="enable-forwarding">
<h2>Enable forwarding<a class="headerlink" href="#enable-forwarding" title="Link to this heading"></a></h2>
<p>To enable packet forwarding need edit /etc/sysctl.conf and add or uncomment next:</p>
<div class="highlight-sh notranslate"><div class="highlight"><pre><span></span>net.ipv4.ip_forward<span class="o">=</span><span class="m">1</span>
net.ipv6.conf.all.forwarding<span class="o">=</span><span class="m">1</span>
</pre></div>
</div>
<p>For apply this params now, use command <code class="docutils literal notranslate"><span class="pre">sysctl</span> <span class="pre">-p</span></code> or after reboot server this params will be applied automatically.</p>
</section>
<section id="mtu">
<h2>MTU<a class="headerlink" href="#mtu" title="Link to this heading"></a></h2>
<p>If used vlan-per-user often required 802.1ad standard also called as QinQ or Q-in-Q, then need to set MTU on main interface and S-VLAN, because adding to headed one more field.
Interface which using QinQ usually consist of <code class="docutils literal notranslate"><span class="pre"><interface_name>.<S-VLAN>.<C-VLAN></span></code>.
S-VLAN (Service VLAN) is TAG which wrap C-VLAN (Customer VLAN).</p>
<p>As example:</p>
<div class="highlight-sh notranslate"><div class="highlight"><pre><span></span>MTU
<span class="w"> </span><span class="m">1504</span>
<span class="w"> </span><span class="p">|</span><span class="w"> </span><span class="m">1504</span>
<span class="w"> </span><span class="p">|</span><span class="w"> </span><span class="p">|</span><span class="w"> </span><span class="m">1500</span>
<span class="w"> </span><span class="p">|</span><span class="w"> </span><span class="p">|</span><span class="w"> </span><span class="p">|</span>
<span class="w"> </span>eth0.2001.101
<span class="w"> </span><span class="p">|</span><span class="w"> </span><span class="p">|</span><span class="w"> </span><span class="p">|</span>
<span class="w"> </span><span class="p">|</span><span class="w"> </span><span class="p">|</span><span class="w"> </span>C-VLAN
<span class="w"> </span><span class="p">|</span><span class="w"> </span>S-VLAN
<span class="w"> </span>Interface
</pre></div>
</div>
<p>Set up MTU on interface eth0 and interface with S-VLAN</p>
<div class="highlight-sh notranslate"><div class="highlight"><pre><span></span>ip<span class="w"> </span>link<span class="w"> </span><span class="nb">set</span><span class="w"> </span>eth0<span class="w"> </span>mtu<span class="w"> </span><span class="m">1504</span>
ip<span class="w"> </span>link<span class="w"> </span><span class="nb">set</span><span class="w"> </span>eth0.2001<span class="w"> </span>mtu<span class="w"> </span><span class="m">1504</span>
</pre></div>
</div>
<div class="admonition-note admonition">
<p class="admonition-title">Note:</p>
<p>If used <code class="docutils literal notranslate"><span class="pre">bonding</span></code> need change MTU on <em>bonding</em> (bond0) and <em>slaves</em> (eth0, eth1 …) interfaces.</p>
</div>
</section>
<section id="increase-arp-cache-size">
<h2>Increase ARP cache size<a class="headerlink" href="#increase-arp-cache-size" title="Link to this heading"></a></h2>
<p>If accel-ppp used as DHCP BRAS important to increase ARP cache size, otherwise you can cache overflow and clients have lost connections. Edit /etc/sysctl.conf and add next:</p>
<div class="highlight-sh notranslate"><div class="highlight"><pre><span></span>net.ipv4.neigh.default.gc_thresh1<span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="m">4096</span>
net.ipv4.neigh.default.gc_thresh2<span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="m">8192</span>
net.ipv4.neigh.default.gc_thresh3<span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="m">12288</span>
net.ipv6.neigh.default.gc_thresh1<span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="m">4096</span>
net.ipv6.neigh.default.gc_thresh2<span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="m">8192</span>
net.ipv6.neigh.default.gc_thresh3<span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="m">12288</span>
</pre></div>
</div>
<p>For apply this params now, use command <code class="docutils literal notranslate"><span class="pre">sysctl</span> <span class="pre">-p</span></code> or after reboot server this params will be applied automatically.</p>
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