The ContentDirector advanced settings enable you to modify the firewall and transport settings of your ContentDirector agent. The ContentDirector advanced settings are located on the ContentDirector - Advanced page.
This section includes the following topics about advanced features that can be configured for group members:
This section includes the following topics about advanced features that can be configured for group leaders:
Use the following recommendations to determine if you need to configure any of the ContentDirector advanced settings.
If the group member is behind a firewall and is unable to communicate with other ContentDirector devices |
Configure the "If this ContentDirector Agent Is behind a NAT-Based Firewall" option. |
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If the group member is unable to communicate with the group leader |
Verify that the group leader IP address is specified in the Group Leader IP Address option. |
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If the group leader is behind a firewall and is unable to communicate with other ContentDirector devices |
Configure the "If this ContentDirector Agent Is behind a NAT-Based Firewall" option. |
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If the group leader uses a satellite or wireless network to distribute ContentDirector data to group members |
Disable the UDP Fragmentation option to ensure that lost packets will not impact performance. |
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If you want the group leader to send data to some group members but not others |
Select the "Use Multiple Multicast IP Addresses for Better Performance" field in the Enable Single Multicast IP Address option. |
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If you want to change the port number of the core application server |
Enter the desired port number in the Core Application Port option. |
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ContentDirector logging is enabled by default. However, you can view and manage ContentDirector logs. |
About ContentDirector logging and Managing the ContentDirector log |
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Specify a ContentDirector bandwidth limit using the NetCache bandwidth allocation management feature. |
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If this CDA is behind a firewall that uses Network Address Translation (NAT) to obscure internal IP addresses, you must specify the IP address of the CDA so that it can communicate with the external ContentDirector devices.
Note
Firewalls configured for dynamic NAT addressing are not supported. The CDA communicating with the core application or group members outside the firewall must have a static NAT address.
To specify the static NAT IP address of the CDA, complete the following steps.
Typically, the group leader IP address is automatically discovered during the ContentDirector agent configuration. However, if you are not using a multicast-enabled network, for unicast group members you can manually a enter comma- or space-delimited list of group leader candidate host names or IP addresses.
To specify the list of group leader candidates, complete the following steps.
Note
If you have multiple group members and do not want to manually enter the group leader IP address on each group member, you can set up a host name in DNS called group_leader or group_leader.domain.com that corresponds to the elected group leader IP address.
By default, the UDP Fragmentation option allows UDP packets to be fragmented when the network supports a maximum MTU size that is smaller than the size of a packet. However, UDP fragmentation is not recommended for high-bandwidth lossy networks, such as satellite or wireless networks, where many dropped packets can impact performance. Although this kind of packet loss is rare in conventional networks, it is common on satellite connections or other forms of wireless communication.
To disable UDP fragmentation, complete the following steps.
| 1 | From the NetCache Manager utility, select Setup tab > ContentDirector > Advanced. |
| 2 | |
| 3 |
The Multicast IP Addressing Mode option enables single or multiple multicast IP addressing for group members. By default single multicast IP addressing is enabled.
When you enable single multicast IP addressing, all group members in a content group receive data, even if you do not want a particular group member to receive content. This method can be inefficient because processing power is expended to determine whether the data is needed.
If you want all group members on the network to receive data, there is no performance difference between single and multiple multicast IP addressing.
You might also want to enable single multicast IP addressing if your organization imposes a limitation on the number of multicasting addresses that can be used on your network.
By default, single multicast IP addressing uses two multicast addresses:
In contrast to single multicast IP addressing, in which all group members receive data whether they need it or not, multiple multicast IP addressing enables you to send data to only those group members that require it. When you enable multiple multicast IP addressing, group members that are to receive data subscribe to a different multicast IP address from within the multicast IP address range 239.100.1.1 - 239.100.1.8.
When you use the multiple multicast IP addressing method, only group members that will receive data will expend CPU time to process the multicast data. All other group members will simply ignore data sent to multicast IP addresses that they are not listening for.
To enable single multicast IP addressing, complete the following steps.
| 1 | From the NetCache Manager utility, select Setup tab > ContentDirector > Advanced. |
| 2 | In the Multicast IP Addressing Mode option, select "Use Single Multicast IP Address." |
| 3 |
The Core Application Port option specifies the port for the core application. The core application uses HTTP for transport. The default port is 8080. See ContentDirector port requirements for more information.
You can specify another HTTP port, but you must ensure that you include the core application port in the HTTP Proxy Ports option on the HTTP - General page.
To change the core application port number, complete the following steps.
| 1 | From the NetCache Manager utility, select Setup tab > ContentDirector > Advanced. |
| 2 | Enter the desired core application port number in the Core Application Port option. |
| 3 |
See the NetCache Manager online Help for more information about the ContentDirector options.
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Part No. 210-00072
File: cdaconf5.htm
Last updated: 10/25/01 16:22:23