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| app-notes:supervision [2015/04/05 13:54] – [Introduction] hess | app-notes:supervision [2015/04/20 09:43] (current) – [Introduction] fachet | ||
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| ====== Supervision ====== | ====== Supervision ====== | ||
| ===== Introduction ===== | ===== Introduction ===== | ||
| - | This note descibes | + | {{: |
| + | This note describes | ||
| functionality. | functionality. | ||
| Line 10: | Line 11: | ||
| Wireless LAN (WLAN), Ethernet or PPP over Ethernet (PPPoE) connections. | Wireless LAN (WLAN), Ethernet or PPP over Ethernet (PPPoE) connections. | ||
| - | The highes | + | The highest |
| - | 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" | + | every "ping interval" |
| milliseconds a retry is done using the "retry interval" | milliseconds a retry is done using the "retry interval" | ||
| If still there is no answer the defined emergency action is executed. It's recommended to set " | If still there is no answer the defined emergency action is executed. It's recommended to set " | ||
| Line 19: | Line 20: | ||
| Emergency action " | Emergency action " | ||
| 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 " | + | " |
| - | 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 | + | if the connection is still established. Different informations like configurable signal |
| 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. | ||
| Line 32: | Line 31: | ||
| ^Condition^ WWAN^ WLAN^ ETH^ PPPoE^ | ^Condition^ WWAN^ WLAN^ ETH^ PPPoE^ | ||
| - | |Modem is registered |X| | | | + | |Modem is registered | X | | | |
| - | |Registered with valid service type |X| | | | + | |Registered with valid service type | X |
| - | |Valid SIM state X | + | |Valid SIM state | |
| - | |Sufficient signal strength X X | + | |Sufficient signal strength |
| - | |Client is associated X | + | |Client is associated |
| - | |Client is authenticated X | + | |Client is authenticated |
| - | |Valid DHCP address retrieved X X X X | + | |Valid DHCP address retrieved |
| - | |Link is up and holds address X X X X | + | |Link is up and holds address |
| - | |Ping check succeeded X X X X | + | |Ping check succeeded |
| + | |||
| + | If at least one condition of a link is not met, the link manager counts the number of subsequent failures. | ||
| + | WWAN links are marked as down after 5 subsequent failures, PPPoE after three, WiFi and Ethernet after one. | ||
| + | The highest priority link which is up will become the so-called hotlink which holds the default route for | ||
| + | outgoing packets. Of course the link manager will change the hotlink as soon a higher priority interface comes up. | ||
| + | |||
| + | 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. | ||
| + | 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 " | ||
| + | is configured in the link supervision. | ||
| + | |||
| + | ===== Summary ===== | ||
| + | - Level 4: VPN dead peer detection/ | ||
| + | * Is VPN link over WAN link healthy? See also [[sdk: | ||
| + | - Level 3: Link level Ping Supervision | ||
| + | * Is link to next network node healthy? | ||
| + | - Level 2: Modem/WiFi Supervision | ||
| + | * Is modem ok, device registered and a sufficient signal available ? | ||
| + | - Level 1: Link Supervison | ||
| + | * Is physical link up or physical connection ok? | ||
| + | - Level 0: Hardware Watchdog | ||
| + | * Is router firmware and operating system running ok? | ||
| ===== Configuration ===== | ===== Configuration ===== | ||
| {{ : | {{ : | ||