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app-notes:supervision [2015/04/05 14:04] hess [Summary] |
app-notes:supervision [2015/04/20 09:43] (current) fachet [Introduction] |
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====== Supervision ====== | ====== Supervision ====== | ||
===== Introduction ===== | ===== Introduction ===== | ||
- | This note descibes which provisions are taken by NetModule Routers to guarantee always-on and always-connected | + | {{:app-notes:24-7.png?nolink&200 |}} |
+ | This note describes which provisions are taken by NetModule Routers to guarantee always-on and always-connected | ||
functionality. | functionality. | ||
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Wireless LAN (WLAN), Ethernet or PPP over Ethernet (PPPoE) connections. | Wireless LAN (WLAN), Ethernet or PPP over Ethernet (PPPoE) connections. | ||
- | The highes level of monitoring is the Ping Supervision which is individually configurable for each active (up) | + | The highest level of monitoring is the Ping Supervision which is individually configurable for each active (up) |
- | link as well generic for any link based on the routing table. The user can define up to two host which are pinged | + | link as well generic for any WWAN link. The user can define up to two host which are pinged |
- | every "ping interval" seconds. If there is no respones of at least one of the two hosts within "ping timeout" | + | every "ping interval" seconds. If there is no response of at least one of the two hosts within "ping timeout" |
milliseconds a retry is done using the "retry interval" time up to "max. number of trial fails". | milliseconds a retry is done using the "retry interval" time up to "max. number of trial fails". | ||
If still there is no answer the defined emergency action is executed. It's recommended to set "restart link services" | If still there is no answer the defined emergency action is executed. It's recommended to set "restart link services" | ||
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Emergency action "none" means that the link is defined as (inactive) down. | Emergency action "none" means that the link is defined as (inactive) down. | ||
If you are using a VPN you should also enable the dead pear detection or keep alive mechanisms. | If you are using a VPN you should also enable the dead pear detection or keep alive mechanisms. | ||
- | For the generic link "ANY" it's recommended to use the application host in your office. | + | "ANY" is a shortcut for all WAN interfaces. |
- | This ping will ensure that even interruptions in the back-bone can be detected and a full point-to-point connection | + | |
- | is guaranteed. | + | |
The** WWAN Manager** who is responsible for the control of the mobile network modems checks every 15 seconds | The** WWAN Manager** who is responsible for the control of the mobile network modems checks every 15 seconds | ||
- | if the connection is still established. Different informations like configurable signal strenght, | + | if the connection is still established. Different informations like configurable signal strength, |
network registration status of service type are used to determine the status of the modem links. | network registration status of service type are used to determine the status of the modem links. | ||
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Finaly a **Hardware Watchdog** is available which will restart the device if he is not retriggered after x seconds. | Finaly a **Hardware Watchdog** is available which will restart the device if he is not retriggered after x seconds. | ||
The Router Suppervision deamon checks permanently if all components of the router application are still alive. | The Router Suppervision deamon checks permanently if all components of the router application are still alive. | ||
- | So in the unlinkely case that the operating systems or the router software has an internal error the system restarts | + | So in the unlikely case that the operating systems or the router software has an internal error the system restarts |
completely by rebooting. This is the only condition where the system will reboot except "reboot system" | completely by rebooting. This is the only condition where the system will reboot except "reboot system" | ||
is configured in the link supervision. | is configured in the link supervision. | ||
===== Summary ===== | ===== Summary ===== | ||
- | - Level 5: Application level Ping Supervision | ||
- | * Is my application server reachable? | ||
- Level 4: VPN dead peer detection/keep alive | - Level 4: VPN dead peer detection/keep alive | ||
- | * Is VPN link over WAN link healthy? | + | * Is VPN link over WAN link healthy? See also [[sdk:vpn-supervision|Supervision of a VPN Tunnel]]. |
- Level 3: Link level Ping Supervision | - Level 3: Link level Ping Supervision | ||
* Is link to next network node healthy? | * Is link to next network node healthy? |