Modify IP Network Browser settings
Enable IP Network Browser to locate as many devices as possible within your network.
- Click File > IP Network Browser Settings.
- To modify the community strings tried when contacting devices, click the Community Strings tab.
- To add a community string, enter the community string you want to add in the New Community String field, and then click Add.
- To remove a community string, click the community string, and then click Delete.
- To change the order in which community strings are attempted, select the community string then click the up or down arrow.
- To modify the number of PINGs sent during the discovery mode or change the delay between Pings, click the Discovery tab. ICMP PINGs are used to initially discover a responding node. If you are connecting over dialup or another slow connection, the wait and delay can be increased for better discovery and to limit traffic generated by the tool.
The number of PINGs per node should always be set to 2 or more, especially when scanning networks using Cisco routers. If the target IP address is not in the ARP cache of the Cisco router, the router discards the ICMP query (PING) while it requests the MAC address of the target IP. The first PING will never reach the subnet of the target IP address. In this situation, the second PING is the one the target IP address responds to.
- To modify the wait period before timing out change the PING time to live for a packet, click the ICMP tab.
- The PING timeout is the number of milliseconds to wait for a reply before assuming that the target IP address is not responding.
- The packet time-to-live is the number of hops you will except while navigating to the specified IP address. With a setting of 32, your PING test could pass through up to 32 different routers on its way to the remote IP address before being thrown away by the network. Normally you would set this to 32 hops.
- To modify the community strings tried when contacting devices, click the SNMP tab.
- The packet timeout designates the number of milliseconds to wait for an SNMP reply before assuming the packet was lost and retrying. You can set this around 600 milliseconds, the internal SNMP logic of the tool automatically adjust when it notices dropped packets.
- Query attempts defines how many times to retry an SNMP query before giving up. Set this to at least 2, to ensure one retry.