Black Box TS560A, User Manual

Page: 36 / 67

33
DHCP On Mode
After detecting incoming link pulses, the tester requests
IP address parameters using the DHCP protocol. The
tester displays the message “DHCP Request” and a count
of attempts to detect link pulses.
This protocol requires a response from a DHCP server
accessible on the LAN. If no response to its request is
received after 10 seconds, the tester will repeat its
request, and increment the count on the screen. Once
the tester gets a response from a server, it displays the
message “Successful.”
No manual configuration is required for the DHCP
protocol to work. If the tester continues to count
requests, the most likely problem is that a DHCP server
is not available on the LAN. In that case, the tester must
be manually configured. For information on that mode,
see the DHCP Off (Manual) Mode section on the next
page.
Once the DHCP server has provided the tester with a
value for the address that the tester will use (MyIP), that
address is checked for conflict. The tester issues an
Address Resolution Protocol (ARP) request directed to
CHAPTER 4: Functional Description