Centos/Linux下如何查看网关地址/Gateway地址？ Linux下查看网关的命令还是很多的，不过如果IP是DHCP获取，那么有些命令是不适用的，当然也有通用的查询网关命令.

1.ifconfig -a 和 cat /etc/resolv.conf  (主要查看ip/netmask和dns)

2.netstat -rn

3.cat /etc/sysconfig/network

4.cat /etc/sysconfig/network-scripts/ifcfg-eth0

5.traceroute 第一行就是自己的网关

6.ip route show

7.route -n

以上几个是比较常用的查询网关的命令。下面是范例：

[root@localhost]# netstat -rn

Kernel IP routing table

Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface

184.82.152.96   0.0.0.0         255.255.255.248 U         0 0          0 eth0

169.254.0.0     0.0.0.0         255.255.0.0     U         0 0          0 eth0

0.0.0.0         184.82.152.97   0.0.0.0         UG        0 0          0 eth0

[root@localhost]# cat /etc/sysconfig/network-scripts/ifcfg-eth0

# Intel Corporation 82567V-2 Gigabit Network Connection

DEVICE=eth0

BOOTPROTO=none

HWADDR=00:1c:c0:f8:a1:ac

ONBOOT=yes

NETMASK=255.255.255.248

IPADDR=184.82.152.98

GATEWAY=184.82.152.97

TYPE=Ethernet

[root@localhost]# ip route show

184.82.152.96/29 dev eth0  proto kernel  scope link  src 184.82.152.98

169.254.0.0/16 dev eth0  scope link

default via 184.82.152.97 dev eth0

[root@localhost]# route -n

Kernel IP routing table

Destination     Gateway         Genmask         Flags Metric Ref    Use Iface

184.82.152.96   0.0.0.0         255.255.255.248 U     0      0        0 eth0

169.254.0.0     0.0.0.0         255.255.0.0     U     0      0        0 eth0

0.0.0.0         184.82.152.97   0.0.0.0         UG    0      0        0 eth0

[root@localhost]#  ifconfig -a

eth0      Link encap:Ethernet  HWaddr 00:1C:C0:F8:A1:AC

inet addr:184.82.152.98  Bcast:184.82.152.103  Mask:255.255.255.248

8、开启/关闭IPv6功能：

[root@ ~]# ifconfig

eth0: flags=4163  mtu 1500

inet 192.168.112.141  netmask 255.255.255.0  broadcast 192.168.112.255

inet6 fe80::bf36:72fd:ae66:3183  prefixlen 64  scopeid 0x20

ether 00:0c:29:0b:28:95  txqueuelen 1000  (Ethernet)

RX packets 18149  bytes 1189590 (1.1 MiB)

RX errors 0  dropped 0  overruns 0  frame 0

TX packets 2382  bytes 219015 (213.8 KiB)

TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73  mtu 65536

inet 127.0.0.1  netmask 255.0.0.0

inet6 ::1  prefixlen 128  scopeid 0x10

loop  txqueuelen 1  (Local Loopback)

RX packets 68  bytes 5908 (5.7 KiB)

RX errors 0  dropped 0  overruns 0  frame 0

TX packets 68  bytes 5908 (5.7 KiB)

TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

[root@ ~]#

[root@ ~]#echo 1 >/proc/sys/net/ipv6/conf/all/disable_ipv6 #"1"表示关闭，"0"表示开启

[root@ ~]# ifconfig

eth0: flags=4163  mtu 1500

inet 192.168.112.141  netmask 255.255.255.0  broadcast 192.168.112.255

ether 00:0c:29:0b:28:95  txqueuelen 1000  (Ethernet)

RX packets 18316  bytes 1203647 (1.1 MiB)

RX errors 0  dropped 0  overruns 0  frame 0

TX packets 2474  bytes 229999 (224.6 KiB)

TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73  mtu 65536

inet 127.0.0.1  netmask 255.0.0.0

loop  txqueuelen 1  (Local Loopback)

RX packets 68  bytes 5908 (5.7 KiB)

RX errors 0  dropped 0  overruns 0  frame 0

TX packets 68  bytes 5908 (5.7 KiB)

TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

[root@ ~]#

echo 1 >/proc/sys/net/ipv6/conf/all/disable_ipv6 #"1"表示关闭，"0"表示开启 该方法是临时生效，一旦机器重启就失效，如果要使系统永久生效，则需要修改grub文件，

具体操作如下：

然后执行命令"grub2-mkconfig  -o /boot/grub2/grub.cfg",重启系统，再验证ipv6模块是否启用

[root@server02 ~]# lsmod|grep ipv6

[root@server02 ~]#

[root@server02 ~]# ifconfig

eth0: flags=4163  mtu 1500

inet 192.168.112.141  netmask 255.255.255.0  broadcast 192.168.112.255

ether 00:0c:29:0b:28:95  txqueuelen 1000  (Ethernet)

RX packets 409  bytes 40194 (39.2 KiB)

RX errors 0  dropped 0  overruns 0  frame 0

TX packets 299  bytes 41149 (40.1 KiB)

TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73  mtu 65536

inet 127.0.0.1  netmask 255.0.0.0

loop  txqueuelen 1  (Local Loopback)

RX packets 4  bytes 340 (340.0 B)

RX errors 0  dropped 0  overruns 0  frame 0

TX packets 4  bytes 340 (340.0 B)

TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

[root@server02 ~]#

通过以上操作即达到永久禁止ipv6模块使用。