Specifying Hosts
For each host specified for host monitoring, there are a number of property parameters that
should be set:
•
Method
The method by which the host is to be polled. This can be one of:
•
ICMP
- ICMP "Ping" polling. An IP address must be specified for this.
•
TCP
- A TCP connection is established to and then disconnected from the host. An IP
address must be specified for this.
•
HTTP
- A normal HTTP server request using a URL. A URL must be specified for this as well
as a text string which is the beginning (or complete) text of a valid response. If no text is
specified, any response from the server will be valid.
•
IP Address
The IP address of the host when using the ICMP or TCP option.
•
Port Number
The port number for polling when using the TCP option.
•
Source IP Selection
The source IP for the outgoing monitoring packets can be set to a specific value. By default,
the IP address of the sending interface is used (the
Automatic
option) but it can be set by
setting this property to
Manual
and specifying an IP address.
•
Interval
The interval in milliseconds between polling attempts. The default setting is 10,000 and the
minimum value allowed is 100 ms.
•
Sample
The number of polling attempts used as a sample size for calculating the
Percentage Loss
and
the
Average Latency
. This value cannot be less than 1.
•
Maximum Failed Poll Attempts
The maximum permissible number of polling attempts that fail. If this number is exceeded
then the host is considered unreachable.
•
Max Average Latency
The maximum number of milliseconds allowable between a poll request and the response. If
this threshold is exceeded then the host is considered unreachable. Average Latency is
calculated by averaging the response times from the host. If a polling attempt receives no
response then it is not included in the averaging calculation.
The Reachability Required Option
An important option that can be enabled for a host is the Reachability Required option. When
this is selected, the host must be determined as accessible in order for that route to be
considered to be functioning. Even if other hosts are accessible, this option says that the
Chapter 4: Routing
300
Summary of Contents for NetDefendOS
Page 30: ...Figure 1 3 Packet Flow Schematic Part III Chapter 1 NetDefendOS Overview 30 ...
Page 32: ...Chapter 1 NetDefendOS Overview 32 ...
Page 144: ...Chapter 2 Management and Maintenance 144 ...
Page 284: ...Chapter 3 Fundamentals 284 ...
Page 392: ...Chapter 4 Routing 392 ...
Page 419: ... Host 2001 DB8 1 MAC 00 90 12 13 14 15 5 Click OK Chapter 5 DHCP Services 419 ...
Page 420: ...Chapter 5 DHCP Services 420 ...
Page 573: ...Chapter 6 Security Mechanisms 573 ...
Page 607: ...Chapter 7 Address Translation 607 ...
Page 666: ...Chapter 8 User Authentication 666 ...
Page 775: ...Chapter 9 VPN 775 ...
Page 819: ...Chapter 10 Traffic Management 819 ...
Page 842: ...Chapter 11 High Availability 842 ...
Page 866: ...Default Enabled Chapter 13 Advanced Settings 866 ...
Page 879: ...Chapter 13 Advanced Settings 879 ...