在fedora12下为何没有IPV4地址？？

我的网卡设置如下：
eth0 Link encap:Ethernet HWaddr 08:00:27:B8:2B:C6
inet6 addr: fe80::a00:27ff:feb8:2bc6/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:6 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 b) TX bytes:468 (468.0 b)
Interrupt:10 Base address:0xd020

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)

只有ipv6的地址，而ipv4的地址没有。为何？我执行service network restart后，在eth0上就可以获得ipv4的地址。(dhcp分配)
（并且我如果将系统reboot后，也会获取IPV4地址），但如果将系统shutdown后，再开启，就不能获取ipv4地址。
eth0 Link encap:Ethernet HWaddr 08:00:27:B8:2B:C6
inet addr:192.168.1.203 Bcast:255.255.255.255 Mask:255.255.255.0
inet6 addr: fe80::a00:27ff:feb8:2bc6/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:6 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 b) TX bytes:468 (468.0 b)
Interrupt:10 Base address:0xd020

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)


/etc/sysconfig/network-scripts/ifcfg-eth0内容如下：
# Advanced Micro Devices [AMD] 79c970 [PCnet32 LANCE]
DEVICE=eth0
HWADDR=08:00:27:B8:2B:C6
ONBOOT=yes
TYPE=Ethernet
BOOTPROTO=dhcp

/etc/sysconfig/network内容如下：
NETWORKING=yes
HOSTNAME=fedora.test


请问各位大侠，如何配置，才能使在开机时就能自动获取IPV4地址？？
并且可以使用ipv4和ipv6共存。
如果我将ipv6禁止，则也可以在开机时自动获取ipv4地址，但我想让ipv6和ipv4共存。
请问有何办法可以做到？还请各位高手大侠指点，万分感谢！！！