求救：centos只能访问内网不能访问外网，以并且出现执行route 命令后的默认网关很慢才出现

.有人发布于 2011/08/01 10:09

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CentOS

Q：centos安装好后，进行了IP及NFS和GW设置，可以在局域网用SSH登录，但是本机只能访问内网不能访问外网，以并且出现执行route 命令后的默认网关很慢才出现

[root@localhost ~]# route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
192.168.1.0     *               255.255.255.0   U     0      0        0 eth0
169.254.0.0     *               255.255.0.0     U     0      0        0 eth0
default         192.168.1.1     0.0.0.0         UG    0      0        0 eth0 <------------------这条记录将近要等20秒才会出来

[root@localhost ~]# ping 192.168.1.237
PING 192.168.1.237 (192.168.1.237) 56(84) bytes of data.
64 bytes from 192.168.1.237: icmp_seq=1 ttl=128 time=0.349 ms
64 bytes from 192.168.1.237: icmp_seq=2 ttl=128 time=0.470 ms

[root@localhost ~]# ping www.baidu.com
ping: unknown host www.baidu.com

[root@localhost ~]# ifconfig (以下信息被部分删节)
eth0      Link encap:Ethernet HWaddr 00:10:5C:EA:1A:38
          inet addr:192.168.1.246 Bcast:192.168.1.255 Mask:255.255.255.0

lo        Link encap:Local Loopback
          inet addr:127.0.0.1 Mask:255.0.0.0

以下我的网络配制：

windows下IP配制，可以访问外网

CENTOS配制

[root@localhost ~]# ifconfig
eth0      Link encap:Ethernet HWaddr 00:10:5C:EA:1A:38
          inet addr:192.168.1.246 Bcast:192.168.1.255 Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
          RX packets:18287 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2990 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:1977631 (1.8 MiB) TX bytes:430445 (420.3 KiB)
          Interrupt:169 Base address:0x2000

lo        Link encap:Local Loopback
          inet addr:127.0.0.1 Mask:255.0.0.0
          UP LOOPBACK RUNNING MTU:16436 Metric:1
          RX packets:14244 errors:0 dropped:0 overruns:0 frame:0
          TX packets:14244 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:16075426 (15.3 MiB) TX bytes:16075426 (15.3 MiB)

[root@localhost ~]# more /etc/sysconfig/network-scripts/ifcfg-eth0
# Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+
DEVICE=eth0
BOOTPROTO=static
HWADDR=00:10:5C:EA:1A:38
ONBOOT=yes
NETMASK=255.255.255.0
IPADDR=192.168.1.246
NETWORK=192.168.1.0

[root@localhost ~]# more /etc/sysconfig/network
NETWORKING=yes
NETWORKING_IPV6=no
HOSTNAME=localhost.localdomain

GATEWAY=192.168.1.1

[root@localhost ~]# more /etc/resolv.conf
search localdomain
nameserver 202.101.226.68
nameserver 202.101.224.69

[root@localhost ~]# service network restart

Shutting down interface eth0:                              [ OK ]
Shutting down loopback interface:                          [ OK ]
Bringing up loopback interface:                            [ OK ]
Bringing up interface eth0:                                [ OK ]

@.有人：防火墙已关闭 [root@localhost ~]# service iptables stop Flushing firewall rules: [ OK ] Setting chains to policy ACCEPT: filter [ OK ] Unloading iptables modules: [ OK ] [root@localhost ~]# iptables -vnL Chain INPUT (policy ACCEPT 21 packets, 1819 bytes) pkts bytes target prot opt in out source destination Chain FORWARD (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination Chain OUTPUT (policy ACCEPT 13 packets, 1628 bytes) pkts bytes target prot opt in out source destination (2011/08/01 10:24)

加载中

华宰

2011/08/01 10:11

试试先把防火墙关掉看看呢？

service iptables stop

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.有人

2011/08/01 10:23

感谢你的回复，关闭还是不行。 [root@localhost ~]# iptables -vnL Chain INPUT (policy ACCEPT 21 packets, 1819 bytes) pkts bytes target prot opt in out source destination Chain FORWARD (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination Chain OUTPUT (policy ACCEPT 13 packets, 1628 bytes) pkts bytes target prot opt in out source destination

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