●Setting for Routers to cross (hops) (a configuration option for Discovery; see Configure the General Settings for Device Discoveries on page 56).

●Configuration of the network routers; if the router is configured to pass multicast requests on to other sections of your network, then a discovery could potentially discover devices on your entire network.

The other option to control the reach of the discoveries is to configure the multicast request to span a certain number of routers (Configure the General Settings for Device Discoveries on page 56). Spanning routers will require the routers to be configured to allow multicast request to be forwarded.

The discovery could also be affected by the configuration of your local firewall (Discovering Devices with HP Web Jetadmin through Firewalls on page 124).

If the router is configured to pass multicast requests on to other sections of the network, and Discovery is configured to cross multiple routers, then a discovery could potentially discover devices across multiple subnets and perhaps your entire network.

Details About Running an SLP Multicast Discovery

(For network device discoveries only.)

If one of the discovery methods you choose is SLP multicast (while creating templates (Create a Discovery Template on page 154), editing templates (Edit a Discovery Template on page 156), or scheduling (Schedule a Discovery on page 151)), then the Choose SLP multicast settings page is displayed. On this page, select the number of routers to cross (or hops) for the discovery. Increasing the number of hops might increase the amount of time for the discovery to complete; plus, it generates more network traffic than a discovery with fewer routers to cross.

HP Web Jetadmin does not add devices that cannot be resolved and managed via SNMP, which might be due to insufficient credentials, to the device list. HP Web Jetadmin enforces device manageability through SNMP before adding devices to the device list.

IP Broadcast Discovery

●IP Broadcast Discoveries for Network Devices

●IP Broadcast Discoveries for PC-Connected Devices

●Details About Running an IP Broadcast Discovery

IP Broadcast discoveries send SNMP query packets (in the form of IP broadcasts) to one or more IP network(s). These are used in both PC-Connected and network device discoveries.

IP Broadcast Discoveries for Network Devices

An IP Broadcast discovery enables you to find devices or HP Web Jetadmin installations when IP broadcast addressees are known. IP broadcast discoveries send SNMP query packets (in the form of IP broadcasts) to one or more IP network(s). One network-specific broadcast address exists for each IP subnet on an IP intranet. IP subnets are determined by the IP network number and the IP subnet mask. IP calculators, available free on the Internet, are a great way to determine IP broadcast addresses. An all 1s IP broadcast can also be used to query the entire intranet. Broadcasting is typically blocked by routers due to traffic spike concerns.

Characteristics of IP broadcast discoveries for network devices include:

●Sends SNMP queries over one or more IP broadcasts.

●Listens for replies and then qualifies network connected devices.

●Default broadcast is the Global Broadcast Address (255.255.255.255).

●Can use one or more known IP broadcast addresses with optional address descriptions.

130 Chapter 3 Device Management

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