HP Network Direr Software Products manual Servers That Cannot Be Selected for Blocking

660CHAPTER 15: PRIORITIZING NETWORK TRAFFIC

Servers That Cannot

be Selected for

Blocking

■The IP address of the server that you wish to block does not belong to a server that is critical to your business, such as a database or e-mail server. Blocking IP addresses such as these may have a major impact on your business.

■The IP address of the server that you wish to block is not an IP address that is served by a DHCP server. A device that has an IP address that is served by a DHCP server can potentially change and this could lead to intermittent problems for users of your network. If one or more of the network infrastructure devices on your network obtained their addresses via DHCP it could prevent your network from functioning correctly.

If you have previously configured the network to block traffic to and from a server it is important that prior to assigning an IP address to a new device (or any existing device whose IP address you wish to change) you check that the IP address that you are about to assign is not an IP address of a server you have blocked. One way to check this is to run the Prioritization Configuration report from the Reports dialog box, which is launched by selecting Tools > Reports and examining the contents of the report for blocked servers.

If you accidently block an IP address then you can rectify this problem by re-running the Prioritize Network Traffic Wizard and removing the server from the list of servers to be blocked.

3Com Network Director prevents you selecting the following servers for blocking:

■The PC that is running 3Com Network Director. If you attempted to block this server 3Com Network Director would no longer be able to contact your network. This would prevent it from configuring the devices on your network.

■Any device in the map that forms part of the network infrastructure, such as a switch, hub or router.

3Com Network Director will not prevent you from blocking traffic to and from a device that is not listed in the map. If any of your network infrastructure devices are not listed in the map you will need to check that you have not accidently selected one of these devices for blocking before configuring traffic prioritization on your network.