LANCOM routers and access points provide the following mechanisms for monitoring lines and connections: LCP polling, Dead Peer Detection, and ICMP polling. This document describes where these mechanisms are configured and which parameters are available.
LCP polling is configured at the following locations:
LANconfig:Menu Communication
-> Protocols -> PPP list -> <Remote site> -> Time
→ Protocols → PPP list → <Remote site> → Time
The value enteredis multiplied by the factor 10to specify the polling interval.
The default value is 0, which disables LCP polling.
The number of Retries is specified in the field below it.
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Command line:Path /Setup/WAN/PPP/
The command set <remote site name> {Time} <value>is used to enter or change a value (e.g. set TEST {Time} 3).
The value enteredis multiplied by the factor 10to specify the polling interval.
The number of retriesis is set with the command set <remote site name>{Try} <value> (e.g. set TEST {Try} 10).
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ICMP Polling (Internet Control Message Protocol):
ICMP polling (ping) is configured at the following locations:
LANconfig:Menu Communication
-> Protocols -> Polling
→ Protocols → Polling table
Remote site to be monitored.
Target IP address(es) 1 to 4 (at least one IP address must be entered)
Time before retrying ICMP polling (every X seconds)
Number of retries, each 1 second apart
Process with a value of 40 seconds and 3 repetitions:
Creation of an ICMP Packet
Wait 40 seconds for an answer => Result: no response
1st repetition
Wait 5 seconds for an answer
2nd repetition
Wait 3 seconds for an answer
3rd and last repetition
Wait 1 second for an answer
Information:
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Info
If the address 0.0.0.0 is entered as IP address 1, the DNS server assigned by the Internet service provider is used as the destination.
The time entered into the polling table defines the time interval between ping requests. If the value
"
0
"
is entered, then the standard value of 30 secondsapplies. If no reply to a ping is receivedthen the remote site will be checked in shorter intervals. The device then tries to reach the remote site once a second. The number of retries defines how many times these attempts are repeated. If the value
"
0
"
is entered, then the standard value of 5 retries applies.
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Hinweis
The address 0.0.0.0 should not be entered as IP address, as DNS servers of Internet service providers often don't respond to a ping (ICMP request). In this case the Internet connection cannot be established or it is interupted!
Command line:Path/Setup/WAN/Polling-Table/
With the command set <remote site name> <IP address 1> <IP address 2> <IP address 3> <IP address 4> <Ping-Interval> <Retries>you can enter or change your values (e.g. set 1und1 8.8.8.8 {Time} 5 {Try} 2).
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DPD (Dead Peer Detection):
Dead Peer Detection can be configured for VPN connectionsat the following locations:
LANconfig:Menu VPN
-> General -> Connection list -> <vpn connection name >
→ General → Connection list → <vpn connection name>
Dead Peer Detection can be specified for each VPN connection here. This prompts a DPD packetto be sent if no packet is received over the VPN tunnel for the specified amount of time.
Information:
Info
The minimum time valuefor the Dead Peer Detection is 30 seconds. If you configure a value that is less than 30 seconds, it is ignored and the default minimum value applies.
Sequence with a value of 60 seconds:
60 seconds go by without receiving a packet
A DPD package is generated
Wait 60 seconds for response
1st retry
Wait 10 seconds
2nd retry
Wait 10 seconds
3rd and final retry
Wait 10 seconds
Terminate the VPN connection
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Command line:Path /Setup/VPN/VPN-Peers
The command set <vpn connection name> {DPD-Inact-Timeout} <value>is used to enter or change a value (e.g. set TEST {DPD-Inact-Timeout} 60).
