Cabletron Systems CSX1000, CSX1200 manual Dhcp Proxy Client ENABLE/DISABLE Flag

USER’S GUIDE

DHCP CONFIGURATION ELEMENTS

DHCP PROXY CLIENT ENABLE/DISABLE FLAG

A global flag that indicates whether the DHCP Proxy Client feature is enabled or not. The proxy client is disabled by default.

MAXIMUM NUMBER OF IP ADDRESSES

Refers to the maximum number of IP addresses obtained from DHCP servers for this network interface. This number of IP addresses can be leased from DHCP servers for this interface and placed into the IP Address Pool. The range of this configuration value is 0 to “x” where “x” is the size of the Address Pool. The default for this value is 0.

Note: If all available entries in the IP Address Pool are assigned to one IP network interfaces’s maximum, there will not be any more available for other interfaces. Therefore, take care to plan accordingly.

NUMBER OF IP ADDRESSES TO PRE-FETCH

The configured number of IP addresses to have available at all times for an IP network interface. This means that the IP addresses have been placed in the IP Address Pool, but have not yet been leased to any remote devices. These IP addresses are sitting in the IP Address Pool waiting to be claimed by remote devices. The range of this configuration value is 0 to “x” where “x” is the maximum IP addresses to obtain for the IP network interface. The default for this value is 0.

LAN PORT ON WHICH TO REACH THE DHCP SERVER

This configuration value contains the number of the LAN port to use in order to reach a DHCP server. The range of this value is 1 to “x” where “x” is the number of configured LAN ports. The default for this value is 1.

DHCP BACKGROUND INFORMATION

The DHCP Proxy Client feature enables the CyberSWITCH to dynamically obtain IP addresses from a DHCP server for IP host devices that support PPP. This feature compliments the DHCP Relay Agent feature, which supports remote bridges. Both features together allow the CyberSWITCH to access the DHCP server to allocate IP addresses to all types of remote IP devices, rather than maintaining separate IP address pools for separate devices.

Remote IP devices that use PPP to connect to the CyberSWITCH use PPP IPCP IP Address negotiation to dynamically obtain their IP addresses. In general, those devices are not capable of using DHCP to obtain the dynamic IP addresses. However, with the DCHP Proxy Client feature, the CyberSWITCH “pretends” to be a DHCP client. When a connection is established and a remote IP host device requests an IP address, the CyberSWITCH (acting as a DHCP client) obtains an IP address from the DHCP server. It then gives it to the remote device via IPCP.

The CyberSWITCH is capable of prefetching some number of IP addresses so that connections can be established faster. You may configure two numbers for each WAN type network interface: the number of the IP addresses to prefetch (“x”), and the maximum number of IP addresses to obtain (“y”). The CyberSWITCH will prefetch “x” IP addresses for the network interface until it has obtained “y” addresses. For example, if the number to prefetch is 3, and the maximum number is 5, then 3 IP addresses will be prefetched immediately. As one IP address is assigned to a remote device, one IP address is obtained from a DHCP server until the total of 5 IP addresses have been obtained.

266 CyberSWITCH