☰

如何使用 ifconfig 更改本地网络信息（ip、网络掩码、广播）

tag-icon • tag-icon linux networking ifconfig
如何使用 ifconfig 更改本地网络信息（ip、网络掩码、广播）

我正在按照本书的步骤Linux Basics for Hackers (No Starch Press, 2018)使用 Kali Linux (2019.1a) 和 VirtualBox，当我更改网络信息（第 3 章）时，我无法再访问互联网。

这是我所做的：

$ ifconfig
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 10.0.2.15  netmask 255.255.255.0  broadcast 10.0.2.255
        inet6 fe80::a00:27ff:fe77:94b  prefixlen 64  scopeid 0x20<link>
        ether 08:00:27:77:09:4b  txqueuelen 1000  (Ethernet)
        RX packets 15771  bytes 18253966 (17.4 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 4016  bytes 243513 (237.8 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 20  bytes 1116 (1.0 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 20  bytes 1116 (1.0 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

$ ping google.com
PING google.com (172.217.25.142) 56(84) bytes of data.
64 bytes from syd15s03-in-f14.1e100.net (172.217.25.142): icmp_seq=1 ttl=63 time=23.10 ms
64 bytes from syd15s03-in-f14.1e100.net (172.217.25.142): icmp_seq=2 ttl=63 time=23.4 ms
^C
--- google.com ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1ms
rtt min/avg/max/mdev = 23.351/23.655/23.959/0.304 ms
$ # Change IP from 10.0.2.15 to 10.0.2.21
$ ifconfig eth0 10.0.2.21 netmask 255.255.255.0 broadcast 10.0.2.255
$ ifconfig
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 10.0.2.21  netmask 255.255.255.0  broadcast 10.0.2.255
        inet6 fe80::a00:27ff:fe77:94b  prefixlen 64  scopeid 0x20<link>
        ether 08:00:27:77:09:4b  txqueuelen 1000  (Ethernet)
        RX packets 230432  bytes 263807948 (251.5 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 58741  bytes 3535449 (3.3 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 20  bytes 1116 (1.0 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 20  bytes 1116 (1.0 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

$ ping google.com
ping: google.com: Name or service not known

我再次检查了书中的命令，我所做的一切似乎都符合。

我如何才能更改我的网络信息而不中断我的网络/互联网访问？

答案1

不要在远程会话中尝试此操作！！！


当更改 eth0 的 IP 地址（也是您的接口）时default route，您也必须更改它。

像这样：

# ifconfig eth0 down
# route del default
# ifconfig eth0 10.0.2.21 netmask 255.255.255.0 broadcast 10.0.2.255
# route add default eth0

这是根据记忆写的，所以你可能需要查阅手册页

相关内容