NETGEAR NMS100 - Manual (Page 53)

Reference Manual for the ProSafe Network Management System NMS100
Troubleshooting and Advanced Configuration 5-5
September 2004 202-10058-01
Broadcast Packet Losses
In many cases network discovery mostly works but you do not see as many devices as you expect.
As many devices are not represented in SNMP ARP tables they can only be discovered with
broadcasts. Broadcasts responses can be lost due to buffer overflows or collisions.
To get around this problem you can enable sequential polling of every possible address within a
discovered subnet. Use the Config/Discovery-Polling menu and select the Ping Scan Subnets
check box then click the Restart button.
Note that ProSafe NMS will not poll ranges that you specify, but only discovered subnets. To
discover more subnets, add more seeds as described in the previous section.
Limiting the Scope of Discovery
If you have a large network but you only want to manage a small part of it, you need to set
discovery address range filters. Discovery filters only specify what should be included. So if you
set any discovery filters you must set enough of them to cover any address ranges you want to
discover.
Address range filters are in dot notation with optional wild-card asterisk characters and numeric
range specifiers. Unless the last element is an asterisk, there must be four dot-separated elements.
The following are some valid examples:
207.*
207.212.33.*
207.100-211.*
198.*.*.22-88
Setting Up New Filters
1. Use the Config/Discovery-Polling menu.
2. Select your system address from the agents list.
3. Click the Filters tab.
4. Enter a filter in the Address Range edit box and
click Add.
5. Repeat for other filters.
6. Click OK.