9
Q
u
i
c
k
R
e
f
e
r
e
n
c
e
14. Once all values are set correctly, type ‘F’ to write these val-
ues into flash memory. The terminal displays the following
screen
:
15. Type ‘Q’ to quit the program and exit back to E86mon. The
following screen displays
.
16. Cycle power to the CRD2700-4000E so that the latest
changes take affect.
Network Address Translation (NAPT)
In both DHCP and static mode, the cradle assigns private IP
addresses to each terminal and performs Network Address
Translation (NAPT) on all TCP/IP and UDP/IP packets as they
transmit through the cradle between the outside network and the
cradle’s private network. The terminals are assigned private
addresses specified in options A-E in the Public network menu
above.
The cradle modifies one IP address and port number pair inside a
TCP/IP and UDP/IP packet header. Those packets going to the
outside network have their source address translated to the IP
address of the cradle and their source port changed to a unique
port number associated with the cradle slot it came from.
Conversely, packets designated to the cradle’s private network
have their destination IP address and port number mapped to the
equivalent private network IP address and port number. The
differences in the port numbers distinguish between packets for
different slots in the cradle. The benefit of both IP address and port
Erasing flash sector at E0000...
Cradle Utilities Version x.xx
I) Flash Info
P) Program Cradle Globals
Q) Quit
Program terminated with result code ‘00’
er86mon
