https://community.extremenetworks.com/t5/extremewireless-identifi/recommended-mtu-size-for-3805i-access-point/m-p/46292#M4213 I See every time few ap's tunnel goes down frequently, is the MTU size the culprit , if yes what is the recommended value of MTU for Identifi 3805i Access Point.<BR /> <BR /> is there any global setting where all AP's MTU can be changed at a time.<BR /> <BR /> Thu, 05 Nov 2015 15:20:00 GMT Saiprasad_Rao_R 2015-11-05T15:20:00Z https://community.extremenetworks.com/t5/extremewireless-identifi/recommended-mtu-size-for-3805i-access-point/m-p/46292#M4213 I See every time few ap's tunnel goes down frequently, is the MTU size the culprit , if yes what is the recommended value of MTU for Identifi 3805i Access Point.<BR /> <BR /> is there any global setting where all AP's MTU can be changed at a time.<BR /> <BR /> Thu, 05 Nov 2015 15:20:00 GMT https://community.extremenetworks.com/t5/extremewireless-identifi/recommended-mtu-size-for-3805i-access-point/m-p/46292#M4213 Saiprasad_Rao_R 2015-11-05T15:20:00Z https://community.extremenetworks.com/t5/extremewireless-identifi/recommended-mtu-size-for-3805i-access-point/m-p/46293#M4214 If the APs are in the LAN the default should work.<BR /> If the APs are connected via a WAN/VPN with reduced MTU you'd need to use the minimum MTU which is supported on the link.<BR /> I.e. I've a AP3825<B>@home</B> = cable modem provider and I've a VPN tunnel with a firewall to the HQ.<BR /> In that case I've used 1300 as my DSL and VPN take away from the max. of 1500.<BR /> <BR /> Normaly the APs should discover the MTU that is supported on the link BUT if the devices between are not setup to support MTU path discovery you'd need to set a static value on the AP.<BR /> Please refer to ...<BR /> <A href="https://community.extremenetworks.com/extreme/topics/access_point_path_mtu_discovery" target="_blank" rel="nofollow noreferrer noopener">https://community.extremenetworks.com/extreme/topics/access_point_path_mtu_discovery</A><BR /> <A href="https://gtacknowledge.extremenetworks.com/articles/Solution/IdentiFi-Wireless-AP-s-do-not-have-backup-data-tunnels-and-uptime-is-not-displaying-in-AP-Availability-report" target="_blank" rel="nofollow noreferrer noopener">https://gtacknowledge.extremenetworks.com/articles/Solution/IdentiFi-Wireless-AP-s-do-not-have-backu...</A><BR /> <BR /> You'd change groups/all APs via AP multi-edit in the GUI &gt; AP &gt; Bulk Configuration &gt; AP Multi-edit Settings<BR /> <BR /> -Ron<BR /> Thu, 05 Nov 2015 15:38:00 GMT https://community.extremenetworks.com/t5/extremewireless-identifi/recommended-mtu-size-for-3805i-access-point/m-p/46293#M4214 Ronald_Dvorak 2015-11-05T15:38:00Z