RuggedCom RuggedRouter RX1100 - Manual (Page 245)

27. Configuring The DHCP server
Revision 1.14.3 245 RX1000/RX1100™
• Boot file server: The IP address of the tftp server to boot from. This only applies to network
booted clients.
• Server name: The hostname of the boot server. This only applies to network booted clients.
• Lease length for BOOTP clients: How long the IP assigned to a BOOTP client should be
considered valid.
• Lease end for BOOTP clients: Cut off date for all BOOTP client leases.
• Dynamic DNS enabled: Should DNS information be updated on the DNS server when a client
receives an IP address.
• Dynamic DNS domain name: The domain name to update dynamic DNS information in.
• Dynamic DNS hostname: Use the specified hostname for clients, or use the hostname supplied
by the client.
• Dynamic DNS reverse domain: The reverser DNS domain to update dynamic information in for
the reverse DNS entry.
• Dynamic DNS reverse domain: The reverser DNS domain to update dynamic information in for
the reverse DNS entry.
Lesser used DHCP server configurations include
• Allow unknown clients: Should DHCP accept requests from clients it has never seen before or
only from clients that have already received leases in the past.
• Server is authoritative: If the server is authoritative, it will send deny messages to any client
which tries to renew a lease which the server knows the client shouldn't have.
• Option 82 Support.
27.1.1.3. Option 82 Support with Disable NAK
If DHCP relay clients (option 82 clients) are used on the same subnet as the DHCP server, some
clients will immediately try to renew a lease right after receiving it by requesting a renewal directly
from the DHCP server. Since the DHCP server is only configured to provide that lease through a relay
agent with the right option 82 fields added, the server will send the client a NAK to disallow use of the
lease. Enabling this option disables this reject message, so that the renewal request that the DHCP
relay agent sends a moment later (which the DHCP server accepts since it has the right option 82
fields added) will be the only message for which the client receives a reply. If the DHCP server and
clients are not on the same subnet, this option is not required. The meaning of the value of many
fields depends on the client's interpretation of the field, so the actual meaning of a field is determined
by the client. See the documentation of the client to determine what values are required by the client
for special options.
27.1.2. Example DHCP Scenarios And Configurations
27.1.2.1. Single Network With Dynamic IP Assignment
In this example the eth1 interface is provided with IP address 192.168.1.1/24 while addresses
192.168.1.101 through 192.168.1.200 are assigned to the clients. The router serves as the default
gateway.