https://wiki.webko.net.ua/index.php?action=history&feed=atom&title=Kernel%3A_Neighbour_table_overflow%2F%D0%9F%D0%B5%D1%80%D0%B5%D0%BF%D0%BE%D0%BB%D0%BD%D0%B5%D0%BD%D0%B8%D0%B5_arp_%D1%82%D0%B0%D0%B1%D0%BB%D0%B8%D1%86%D0%B8 2026-05-11T10:20:01Z История изменений этой страницы в вики MediaWiki 1.35.1 https://wiki.webko.net.ua/index.php?title=Kernel:_Neighbour_table_overflow/%D0%9F%D0%B5%D1%80%D0%B5%D0%BF%D0%BE%D0%BB%D0%BD%D0%B5%D0%BD%D0%B8%D0%B5_arp_%D1%82%D0%B0%D0%B1%D0%BB%D0%B8%D1%86%D0%B8&diff=549&oldid=prev 2017-05-19T07:16:56Z

<p></p> <table class="diff diff-contentalign-left diff-editfont-monospace" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="ru"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Предыдущая</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Версия 07:16, 19 мая 2017</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l35" >Строка 35:</td> <td colspan="2" class="diff-lineno">Строка 35:</td></tr> <tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>net.ipv4.neigh.default.gc_stale_time = 120</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>net.ipv4.neigh.default.gc_stale_time = 120</div></td></tr> <tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>&lt;/syntaxhighlight&gt;</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>&lt;/syntaxhighlight&gt;</div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">&lt;spoiler hide=&quot;На случай если не помогло&quot; show=&quot;На случай если не помогло&quot;&gt;</ins></div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Если указанные выше значения не помогли можно попробывать установить значения больше</ins></div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">&lt;syntaxhighlight lang=&quot;bash&quot;&gt;</ins></div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">net.ipv4.neigh.default.gc_thresh1 = 4096</ins></div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">net.ipv4.neigh.default.gc_thresh2 = 8192</ins></div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">net.ipv4.neigh.default.gc_thresh3 = 8192</ins></div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">net.ipv4.neigh.default.base_reachable_time = 86400</ins></div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">net.ipv4.neigh.default.gc_stale_time = 86400</ins></div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">&lt;/syntaxhighlight&gt;</ins></div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">&lt;/spoiler&gt;</ins></div></td></tr> <tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Применяем изменения</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Применяем изменения</div></td></tr> <tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>&lt;syntaxhighlight lang=&quot;bash&quot;&gt;</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>&lt;syntaxhighlight lang=&quot;bash&quot;&gt;</div></td></tr> <tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>sysctl -p</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>sysctl -p</div></td></tr> <tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>&lt;/syntaxhighlight&gt;</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>&lt;/syntaxhighlight&gt;</div></td></tr> <tr><td class='diff-marker'>−</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;"></del></div></td><td colspan="2"> </td></tr> <tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[Категория:Linux]]</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[Категория:Linux]]</div></td></tr> </table>

Sol https://wiki.webko.net.ua/index.php?title=Kernel:_Neighbour_table_overflow/%D0%9F%D0%B5%D1%80%D0%B5%D0%BF%D0%BE%D0%BB%D0%BD%D0%B5%D0%BD%D0%B8%D0%B5_arp_%D1%82%D0%B0%D0%B1%D0%BB%D0%B8%D1%86%D0%B8&diff=548&oldid=prev 2017-05-19T07:04:49Z

<p>Новая страница: «при переходе на использование сетей больше чем /24 можно наблюдать переполнение arp таблиц…»</p> <p><b>Новая страница</b></p><div>при переходе на использование сетей больше чем /24 можно наблюдать переполнение arp таблици маршрутизатора, ето может сопровождатся нестабильной работой сети и значитильным увиличением броадкаст трафика. В syslog роутера можно заметить такое сообщение:<br /> &lt;syntaxhighlight lang=&quot;bash&quot;&gt;<br /> Apr 17 15:22:42 uma kernel: [12562.837562] Neighbour table overflow.<br /> Apr 17 15:22:42 uma kernel: [12562.867554] printk: 87 messages suppressed.<br /> &lt;/syntaxhighlight&gt;<br /> <br /> Ниже приведен список параметров для ядра призванных исправить ету ситуацию.<br /> &lt;syntaxhighlight lang=&quot;bash&quot;&gt;<br /> # The minimum number of entries to keep in the ARP cache. The garbage collector will<br /> # not run if there are fewer than this number of entries in the cache.<br /> net.ipv4.neigh.default.gc_thresh1 = 128<br /> <br /> # The soft maximum number of entries to keep in the ARP cache. The garbage collector will<br /> # allow the number of entries to exceed this for 5 seconds before collection will be performed.<br /> net.ipv4.neigh.default.gc_thresh2 = 512<br /> <br /> # The hard maximum number of entries to keep in the ARP cache. The garbage collector will<br /> # always run if there are more than this number of entries in the cache.<br /> net.ipv4.neigh.default.gc_thresh3 = 1024<br /> <br /> # How frequently the garbage collector for neighbour entries should attempt to run.<br /> net.ipv4.neigh.default.gc_interval = 30<br /> <br /> # Determines how often to check for stale neighbour entries. When a neighbour entry<br /> # is considered stale it is resolved again before sending data to it.<br /> net.ipv4.neigh.default.gc_stale_time = 60<br /> &lt;/syntaxhighlight&gt;<br /> <br /> ''vim /etc/sysctl.d/98-router.conf''<br /> &lt;syntaxhighlight lang=&quot;bash&quot;&gt;<br /> net.ipv4.neigh.default.gc_thresh1 = 256<br /> net.ipv4.neigh.default.gc_thresh2 = 1024<br /> net.ipv4.neigh.default.gc_thresh3 = 2048<br /> net.ipv4.neigh.default.gc_interval = 60<br /> net.ipv4.neigh.default.gc_stale_time = 120<br /> &lt;/syntaxhighlight&gt;<br /> Применяем изменения<br /> &lt;syntaxhighlight lang=&quot;bash&quot;&gt;<br /> sysctl -p<br /> &lt;/syntaxhighlight&gt;<br /> <br /> [[Категория:Linux]]</div>

Sol