User`s guide
16
4.2 PING Setup Sub-Menu
This is the sub-menu title screen for the IP address conguration of
the DHCP Off (Manual) PING test mode. The settings of these values
interact with each other to force the Router IP address to be accessible
on the same LAN segment as the LanScaper™. An off-LAN router
cannot be addressed by the tester, and therefore is not a useful setup
option. Pressing the SEL button drops the tester into the manual IP
conguration screens. The up/down arrow buttons scroll through the
options in this sub-menu. This sub-menu is exited by scrolling to the “Sel
to go to Main Menu” screen and pressing SEL, or by pressing CABLE or
NTWRK to exit to a test mode.
When one of the option screens is displayed, pressing the SEL button
drops the tester into the edit IP address screen for that option. Note
that the tester’s IP address, MyIP, can only be set to non-reserved IP
addresses. This is any address other than 0.0.0.0, or 224-255.x.x.x.
MyIP is edited in a similar fashion to the Target IP addresses described
above. The Router IP address is also edited in a similar fashion to the
Target’s. In addition, the Router IP address is forced to be on the same
LAN segment as MyIP. This means that the Netmask, whose bits dene
the LAN segment, is compared with MyIP, and the bits that must be
common between MyIP and the Router IP are forced to the correct state.
The check of the Router’s address is done whenever MyIP, the Router
IP, or the Netmask are edited. The Netmask is a special set of numbers
that are similar to an IP address, but must be a string of 1’s, from the
highest order bit down, dening the bits that must match between MyIP
and any device it tries to access on the LAN segment. If the IP address
bits match, the device is on the LAN segment, and can be addressed
directly. If they do not match, the tester must redirect it’s IP packet to
the Router for forwarding. Editing the Netmask is limited to setting valid
bit combinations that allow for LAN segments with 5 to 253 possible
devices.
4.3 Last DHCP
This sub-menu allows the user to view the results of the most recent
DHCP negotiation between the LanScaper™ and a DHCP server.
The values displayed cannot be modied, only viewed to determine
the conguration of the LAN segment under test. Pressing the SEL
button drops the tester into the DHCP display screens. The up/down
arrow or SEL buttons scroll through the screens in this sub-menu. The
information obtained for each item in the sub-menu can be viewed by
pressing the SEL button. Any 000.000.000.000 entries mean that the
last DHCP server did not provide the requested information. If all entries
are 000.000.000.000, the most likely cause is that DHCP On mode was