无法浏览外网，寝食难安，拜求大家会诊解决！！

近日新安装了Fedora Core4系统后，对于网络的使用出现了一点问题，查看了很多资料也没能解决，现恳求大家会诊解决,在此拜谢！！

1.故障现象：
同一台IBM T40笔记本电脑，安装有winXP和Fedora Core 4两种操作系统。局域网环境(IP地址采用DHCP分配)。
在WinXP环境下采用IP地址分配和DNS设置自动检测的方法，网络使用正常，
但在Fedora Core4环境下，仍采用IP地址分配和DNS设置自动检测的方法后，只能采用直接输入IP地址浏览内网，无法访问外网。
(另，此前在相同的环境下安装的Rehat9故障也如此)

2.这是同台电脑在WinXP下的网络配置情况：
Windows IP Configuration
Host Name . . . . . . . . . . . . : IBMT40
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
DNS Suffix Search List. . . . . . : ltxl.xbzb.sinopec.com.cn
Ethernet adapter :
Connection-specific DNS Suffix . : ltxl.xbzb.sinopec.com.cn
Description . . . . . . . . . . . : Intel(R) PRO/100 VE Network Connection
Physical Address. . . . . . . . . : 00-09-6B-3F-DC-75
Dhcp Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
IP Address. . . . . . . . . . . . : 10.207.96.207
Subnet Mask . . . . . . . . . . . : 255.255.255.192
Default Gateway . . . . . . . . . : 10.207.96.254
DHCP Server . . . . . . . . . . . : 10.207.96.3
DNS Servers . . . . . . . . . . . : 61.128.99.133
10.207.96.4
Primary WINS Server . . . . . . . : 10.207.96.4
Lease Obtained. . . . . . . . . . : 2005年8月1日 11:04:59
Lease Expires . . . . . . . . . . : 2005年8月1日 23:04:59

3.这是Fedora下的网络情况：
(1)ping -a
eth0 Link encap:Ethernet HWaddr 00:09:6B:3F:DC:75
inet addr:10.207.96.207 Bcast:10.207.96.255 Mask:255.255.255.192
inet6 addr: fe80::209:6bff:fe3f:dc75/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:50 errors:0 dropped:0 overruns:0 frame:0
TX packets:27 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:5903 (5.7 KiB) TX bytes:2630 (2.5 KiB)

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:1209 errors:0 dropped:0 overruns:0 frame:0
TX packets:1209 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:1302184 (1.2 MiB) TX bytes:1302184 (1.2 MiB)

sit0 Link encap:IPv6-in-IPv4
NOARP MTU:1480 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)

(2)route
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
10.207.96.192 * 255.255.255.192 U 0 0 0 eth0
169.254.0.0 * 255.255.0.0 U 0 0 0 eth0
default 10.207.96.254 0.0.0.0 UG 0 0 0 eth0

(3)more /etc/resolv.conf
; generated by /sbin/dhclient-script
search ltxl.xbzb.sinopec.com.cn
nameserver 61.128.99.133
nameserver 10.207.96.4

(4)more /etc/sysconfig/network-scripts/ifcfg-eth0
# Please read /usr/share/doc/initscripts-*/sysconfig.txt
# for the documentation of these parameters.
IPV6INIT=no
ONBOOT=yes
USERCTL=no
PEERDNS=yes
TYPE=Ethernet
DEVICE=eth0
HWADDR=00:09:6b:3f:dc:75
BOOTPROTO=dhcp

(5)more /etc/hosts
# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1 localhost.localdomain localhost IBMT40

(6)ping命令测试
本地回环
[root@IBMT40 ~]# ping -b 127.0.0.0
WARNING: pinging broadcast address
PING 127.0.0.0 (127.0.0.0) 56(84) bytes of data.
64 bytes from 127.0.0.1: icmp_seq=0 ttl=64 time=0.049 ms
64 bytes from 127.0.0.1: icmp_seq=1 ttl=64 time=0.046 ms
64 bytes from 127.0.0.1: icmp_seq=2 ttl=64 time=0.046 ms
64 bytes from 127.0.0.1: icmp_seq=3 ttl=64 time=0.044 ms

--- 127.0.0.0 ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 2999ms
rtt min/avg/max/mdev = 0.044/0.046/0.049/0.005 ms, pipe 2

本机IP
[root@IBMT40 ~]# ping 10.207.96.207
PING 10.207.96.207 (10.207.96.207) 56(84) bytes of data.
64 bytes from 10.207.96.207: icmp_seq=0 ttl=64 time=0.056 ms
64 bytes from 10.207.96.207: icmp_seq=1 ttl=64 time=0.049 ms
64 bytes from 10.207.96.207: icmp_seq=2 ttl=64 time=0.040 ms
64 bytes from 10.207.96.207: icmp_seq=3 ttl=64 time=0.045 ms

--- 10.207.96.207 ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 2999ms
rtt min/avg/max/mdev = 0.040/0.047/0.056/0.009 ms, pipe 2

网关IP
[root@IBMT40 ~]# ping 10.207.96.254
PING 10.207.96.254 (10.207.96.254) 56(84) bytes of data.
64 bytes from 10.207.96.254: icmp_seq=0 ttl=255 time=1.56 ms
64 bytes from 10.207.96.254: icmp_seq=1 ttl=255 time=3.99 ms
64 bytes from 10.207.96.254: icmp_seq=2 ttl=255 time=2.71 ms
64 bytes from 10.207.96.254: icmp_seq=3 ttl=255 time=1.22 ms

--- 10.207.96.254 ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3004ms
rtt min/avg/max/mdev = 1.222/2.373/3.992/1.087 ms, pipe 2

主DNS
[root@IBMT40 ~]# ping 61.128.99.133
PING 61.128.99.133 (61.128.99.133) 56(84) bytes of data.

--- 61.128.99.133 ping statistics ---
523 packets transmitted, 0 received, 100% packet loss, time 521966ms
主DNS无法Ping通
在我处的局域网中， winXP环境下主DNS也无法ping通
Pinging 61.128.99.133 with 32 bytes of data: Request timed out. Request timed out.
Request timed out.
Ping statistics for 61.128.99.133: Packets: Sent = 1, Received = 0, Lost = 1 (100% loss),

次DNS
[root@IBMT40 ~]# ping 10.207.96.4
PING 10.207.96.4 (10.207.96.4) 56(84) bytes of data.
64 bytes from 10.207.96.4: icmp_seq=0 ttl=127 time=0.213 ms
64 bytes from 10.207.96.4: icmp_seq=1 ttl=127 time=0.200 ms
64 bytes from 10.207.96.4: icmp_seq=2 ttl=127 time=0.202 ms
64 bytes from 10.207.96.4: icmp_seq=3 ttl=127 time=0.192 ms

--- 10.207.96.4 ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 2999ms
rtt min/avg/max/mdev = 0.192/0.201/0.213/0.018 ms, pipe 2

(7)service network restart正在关闭接口 eth0： [ 确定 ]
关闭环回接口： [ 确定 ]
弹出环回接口： [ 确定 ]
弹出界面 eth0：
正在决定 eth0 的 IP 信息...完成。
[ 确定 ]

(8)nslookup命令[root@IBMT40 ~]# nslookup
> 163.com
Server: 10.207.96.4
Address: 10.207.96.4#53

Non-authoritative answer:
Name: 163.com
Address: 220.181.29.154
> www.163.com
Server: 10.207.96.4
Address: 10.207.96.4#53

Non-authoritative answer:
www.163.com canonical name = www.cache.split.netease.com.
Name: www.cache.split.netease.com
Address: 220.181.28.42
> exit

[root@IBMT40 ~]#

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Subject: Re: 无法浏览外网，寝食难安，拜求大家会诊解决！！ Author: a3bf459b Posted: 2005-08-07 04:59 Length: 371 byte(s)
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iptables? SELinux? 试一下调整上面两个部件的配置吧，说不定有帮助。 Fedora Core我没仔细研究，只不过在公司电脑里装了。感觉和以前的Red Hat没有实质区别，可是X.Org的配置文件就让我苦恼不久…… 没办法，以前都用XFree86的你可能安装或配置的时候使用了不正确的设置，导致某些packets/frames无法传送？
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