red hat 9可以ping通局域网，但不能上网

[i=s] 本帖最后由 359977465 于 2010-3-25 11:58 编辑 [/i]

[root@localhost ~]# ifconfig
eth0 Link encap:Ethernet HWaddr 00:C0:9F:94:78:0E
inet addr:192.168.1.88 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::2c0:9fff:fe94:780e/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:850 errors:0 dropped:0 overruns:0 frame:0
TX packets:628 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:369135 (360.4 KiB) TX bytes:75945 (74.1 KiB)
Interrupt:10 Base address:0x3000

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:57 errors:0 dropped:0 overruns:0 frame:0
TX packets:57 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:8121 (7.9 KiB) TX bytes:8121 (7.9 KiB)


如果这样设置，只能ping能局域网。

把Bcast改成路由网关ＩＰ　192.168.1.1　后才能上网

这是为什么？这个不是广播地址吗？怎么要这样设置才能上网？