CANOGA PERKINS 9145E Standard NID Software Version 1.0 - Manual (Page 49)

Diagnostics 9145E NID Software User’s Manual
PING Generation
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8. Packet DF Bit - The DF (Don’t Fragment) Bit is an identifier in the packet that determines if this
packet can be fragmented to smaller packets.
9. Test Duration min:sec - Sets the amount of time the test will run in minutes and seconds. A
setting of 0 will allow the test to run forever.
10. Min Test Payload Size (40 - 1954) - Set the minimum test size, in bytes. The 9145E sends test
packets ranging in size from the minimum packet setting to the maximum packet setting (sweep), if
they are different. The minimum payload size must be less than, or equal to, the maximum payload
size. If a sweep is being performed, the size will be incremented by 1 byte for each message sent
until the maximum test payload size is reached, the decremented by 1 byte for each message sent
until the minimum payload size is reached, then repeated as necessary.
11. Max Test Payload (40 - 1954) - Set the maximum test payload size, in bytes. The maximum
payload size must be equal to, or greater than, the minimum payload size.
NOTE: If the DF Bit is clear, the actual maximum packet size is 1954. The DF Bit
must be set for oversized packets greater than 1518 (payload size greater
than 1472) to be sent or the packet will be fragmented (sent as multiple
packets of size 1518).
12. Start/Stop Test - Start and Stop testing.
4.3 PING Generation
The PING Generation screen (also available from the Utility menu) is used to determine if a destination is
reachable from the NID. From the Diagnostics menu, type 3 and press Enter. The PING Generation
screen (Figure 4-4) opens.
1. At the PING Generation screen, select Ping to Address (1). Enter the destination IP address and
press Enter.
2. Select (2) to change the Ping from Address. Use the Space Bar to cycle through Test IP (if
available), Mgr IP, Aux IP, and Auto Selection. Type Enter to lock in a selection. The Auto
Selection setting will start first with the Test IP.
If the Ping to Address is in the Test Network Subnet, the Test IP will be used in the ping packet. If
the Test IP is not available or the Ping to Address is not in the Test Network Subnet, the Aux IP is
checked. If the Aux IP is not available or the Ping to Address is not the Aux Network Subnet, the
Manager IP is used. Any address can be used with the Manager IP since it has access to the
Default Gateway.
If the Ping from Address is specified as the Test IP or the Aux IP, and the Ping to Address is not
located in the matching subnet, the destination is unreachable. An error message is displayed
when the Start Pinging command is given.
3. Select (3) to enter the Ping Count from 1 to 255 (0 = forever).
4. Select (4) to enter the Ping VLAN ID. The VLAN ID is only writable if the Ping from Address is the
Test IP, or the Aux IP if Aux Allow Any VLAN is enabled.
5. Select (5) to enter the Ping Payload Size between 40 and 1954. To send packets greater than
1518 (payload size greater than 1472), the DF (Don't Fragment) bit must be set or the packet will
be fragmented (sent as multiple packets of size 1518).
6. Select (6) to change the Ping DF Bit setting. See the Ping Payload size for explanation.
7. When finished setting up the PING Generation screen (Figure 4-5) entries, select Start Ping (7)
and press Enter. The PING test starts.
8. When the test is complete, press Esc to return to the PING Generation screen.