RuggedCom RX1100, RX1000 manual Option 82 Support with Disable NAK

Chapter 21 - Configuring The DHCP server

∙Boot filename: The filename the client should request from a tftp server to boot from. This only applies to network booted clients.

∙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.

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.

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