Appendix
AX3000 Models 80 and 85 - User's Manual 191
The AX3000 route table is:
A.3 - THE DHCP PROTOCOL
DHCP (Dynamic Host Configuration Protocol) is an industry standard protocol that lets a DHCP
server (Unix, Windows, AS/400, etc.) allocate temporary IP addresses and other network
parameters to thin clients and PCs when they are powered on. This can greatly simplify managing
large networks.
A.3.1 - Overview
Here is a brief description of Axel’s implementation DHCP:
- At boot time the AX3000 broadcasts DHCP requests to find the DHCP server.
- If a DHCP server is found and correctly set-up, an IP address, and subsequently other
parameters are given to the AX3000.
- Before accepting the IP address the AX3000 can be set to check that the IP address given
really is free (ARP protocol).
- The IP address offered is given temporarily. This duration is called the 'Lease Time'.
- If a lease time has been entered through the AX3000 Set-Up, this lease time is offered to the
DHCP server, which may or may not accept this value.
- The AX3000 is expected to renew its lease before the lease expires. Once the lease has
expired the AX3000 is no longer permitted to use the assigned IP address.
- Generally an IP address is dynamically assigned out of a pool of IP addresses. However
static IP addresses can be associated to AX3000s (for instance when the AX3000’s print
server is used). This association is performed either by using the AX3000 Ethernet address
or by using a 'Client Identifier' (which is a character string entered through the AX3000 Set-
Up).
- The DHCP protocol can be considered as a superset of the BOOTP protocol. IP addresses
can also be offered to AX3000s by a BOOTP server (in this case the 'lease time' is infinite).
- The AX3000 DHCP client protocol is compliant with RFCs 1533 and 1541.
This section deals only with the AX3000 DHCP protocol use. To set-up and enable a DHCP server
please read your operating system’s manual.
A.3.2 - Setting-Up the AX3000
DHCP protocol is set through either the AX3000 Quick Set-Up or the AX3000 Interactive Set-up.
For more information, see Chapters 2 and 3.
A.3.3 - Using the AX3000
If the DHCP protocol is enabled the AX3000 automatically requests an IP address on boot, the
message 'DHCP in progress' is displayed on the bottom of the screen.
Note: the search can be aborted by entering the set-up.
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