dhcp服务器配置问题?

我有两张网卡,一张拥有一个合法的ip(202.197.x.x)地址,接入internet,令一张联接使用192.168.1.0的内部网络,使用nat共享上网,我希望在内部的网卡上开启dhcp服务,所以安装了dhcpd服务器,但我发现只有在配置时将两张网卡都启用dhcp服务才能起动(建立两个子网,设置两个地址池),否则会退出,我不希望在外部网卡上启用dhcp服务,我应该怎么办了?

以下是只建立一个192.168.1.0/255.255.255.0子网时启动的错误信息
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Failed to start dhcpd :

Internet Software Consortium DHCP Server 2.0pl5
Copyright 1995, 1996, 1997, 1998, 1999 The Internet Software Consortium.
All rights reserved.

Please contribute if you find this software useful.
For info, please visit http://www.isc.org/dhcp-contrib.html

Listening on Socket/eth1/192.168.0.0
Sending on   Socket/eth1/192.168.0.0
No subnet declaration for eth0 (202.197.x.x).
Please write a subnet declaration in your dhcpd.conf file for the
network segment to which interface eth0 is attached.
exiting.