With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
swL3RelayBootpCtrlEntry
Switch L3 Relay Bootp Control Entry
1.3.6.1.4.1.171.11.70.5.3.3.1.4.1
A list of information specifies the IP address as a destination to forward (relay) BOOTP packets to.
Back to SWL3MGMT-MIB MIB page.
IPHost Network monitor allows you to monitor swL3RelayBootpCtrlEntry on D-Link device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring D-Link switches right now.
