Name: Cisco ASA Series
Brand: Cisco
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Cisco ASA Series CLI Configuration Guide

Chapter 1 Configuring DHCP

Licensing Requirements for DHCP

Table 1-1 shows the licensing requirements for DHCP.

Table 1-1 Licensing Requirements

For the ASA 5505, the maximum number of DHCP client addresses varies depending on the license:

• If the limit is 10 hosts, the maximum available DHCP pool is 32 addresses.

• If the limit is 50 hosts, the maximum available DHCP pool is 128 addresses.

• If the number of hosts is unlimited, the maximum available DHCP pool is 256 addresses.

Note The ASA 5505 ships with a 10-user license.

Guidelines and Limitations

Use the following guidelines to configure the DHCP server:

• You can configure only one DHCP server on each interface of the ASA. Each interface can have its

own pool of addresses to use. However the other DHCP settings, such as DNS servers, domain name,

options, ping timeout, and WINS servers, are configured globally and used by the DHCP server on

all interfaces.

• You cannot configure a DHCP client or DHCP relay service on an interface on which the server is

enabled. Additionally, DHCP clients must be directly connected to the interface on which the server

is enabled.

• The ASA does not support QIP DHCP servers for use with the DHCP proxy service.

• The relay agent cannot be enabled if the DHCP server is also enabled.

• The ASA DHCP server does not support BOOTP requests. In multiple context mode, you cannot

enable the DHCP server or DHCP relay service on an interface that is used by more than one context.

• When it receives a DHCP request, the ASA sends a discovery message to the DHCP server. This

message includes the IP address (within a subnetwork) that was configured with the

dhcp-network-scope command in the group policy. If the server has an address pool that falls

within that subnetwork, the server sends the offer message with the pool information to the IP

address—not to the source IP address of the discovery message.

For example, if the server has a pool in the range of 209.165.200.225 to 209.165.200.254, mask

255.255.255.0, and the IP address specified by the dhcp-network-scope command is

209.165.200.1, the server sends that pool in the offer message to the ASA.

Use the following guidelines to configure the DHCP relay service:

• DHCP clients must be directly connected to the ASA and cannot send requests through another relay

agent or a router.

Model License Requirement

All models Base License.

Cisco ASA Series User Manual

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