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ip addr show 显示一个接口上有两个 IP 地址

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ip addr show 显示一个接口上有两个 IP 地址

我以奇怪的方式在单个接口上看到两个 IP 地址。这是我的输出配置文件

eth0      Link encap:Ethernet  HWaddr b8:27:eb:26:b1:c8  
          inet addr:10.0.0.22  Bcast:10.255.255.255  Mask:255.0.0.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:456 errors:0 dropped:0 overruns:0 frame:0
          TX packets:519 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:63643 (62.1 KiB)  TX bytes:111910 (109.2 KiB)

这是我的/etc/网络/接口文件输出

auto lo
iface lo inet loopback

auto eth0
allow-hotplug eth0
iface eth0 inet static
        address 10.0.0.22
        subnet  255.255.255.0
        gateway 10.0.0.1

auto eth1
allow-hotplug eth1
iface eth1 inet static
#       address 0
#       subnet  255.255.255.0
#       gateway 192.168.0.2

这是我的输出sudo ip addr 显示

1: lo: <LOOPBACK> mtu 65536 qdisc noop state DOWN 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether b8:27:eb:26:b1:c8 brd ff:ff:ff:ff:ff:ff
    inet 10.0.0.22/8 brd 10.255.255.255 scope global eth0
       valid_lft forever preferred_lft forever
    inet 10.0.0.100/24 brd 10.0.0.255 scope global eth0
       valid_lft forever preferred_lft forever
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master ovs-system state UP qlen 1000
    link/ether 00:00:00:00:6c:f8 brd ff:ff:ff:ff:ff:ff
    inet 169.254.78.64/16 brd 169.254.255.255 scope global eth1
       valid_lft forever preferred_lft forever

正如我们在这里看到的eth0有两个 IP 地址，并且仅通过 ip 命令显示，而不是通过 ifconfig 或 /etc/network/interfaces 文件显示。我无法理解这是从哪里来的，或者如何永久禁用第二个 IP。我想永久摆脱第二个 IP 地址。

我还注意到，这个 IP 是在系统启动后一秒钟左右出现的。当我执行 dmesg 时，我看到最后几行：

[   15.270464] device eth1 entered promiscuous mode
[   15.576206] asix 1-1.4:1.0 eth1: link up, 100Mbps, full-duplex, lpa 0xCDE1

答案1

我遇到过同样的问题。

最后发现，在我的发行版（debian jessie）中，静态 ip 是在文件中设置的/etc/dhcpcd.conf看起来像：

 ...
 39 # A hook script is provided to lookup the hostname if not set by the DHCP
 40 # server, but it should not be run by default.
 41 nohook lookup-hostname
 42 ## interface eth0
 43   static ip_address=192.168.1.2/24
 44   static routers=192.168.1.254
 45   static domain_name_servers=192.168.1.254
 46 ## interface eth0
 47   static ip_address=192.168.0.3/24
 48   static routers=192.168.0.1
 49   static domain_name_servers=192.168.0.1

因此，我从该文件中删除了该额外记录，并永久解决了该问题。

希望它能够帮助到别人...

答案2

我知道这是老话题了，但是，

eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether b8:27:eb:26:b1:c8 brd ff:ff:ff:ff:ff:ff
    **inet 10.0.0.22/8** brd 10.255.255.255 scope global eth0
       valid_lft forever preferred_lft forever

    **inet 10.0.0.100/24** brd 10.0.0.255 scope global eth0
       valid_lft forever preferred_lft forever

请求是“如何摆脱“10.0.0.100/24”地址

这将摆脱它

ip address del 10.0.0.100/24 dev eth0

这将使其恢复

ip address add 10.0.0.100/24 dev eth0

这些都是“非持久性的”，所以更好的问题可能是，是什么让这个地址一直放在你的接口上

答案3

我遇到了同样的问题。

尝试在我的电脑中设置静态 IP 后/etc/netplan/99-config.yaml，仍然无法获得网络连接（以及看到两个 IP 地址ip a）。我四处寻找并发现 dhcpd 可能是原因之一。

cat /etc/dhcpd.conf

制作：

...
# Generate SLAAC address using the Hardware Address of the interface
#slaac hwaddr
# OR generate Stable Private IPv6 Addresses based from the DUID
slaac private
interface enp3s0
        static ip_address=192.168.0.15/24
        static routers=192.168.0.1
        static domain_name_servers=127.0.0.1

我可以看到，由于某种原因，我设置了一个静态 IP /etc/dhcpd.conf。

所以我删除了那些行，最后我能够建立网络连接，并且ip a只显示我设置的静态 IP /etc/netplan/99-config.yaml。

答案4

whois对该 IP 地址进行查询显示 ：

WHOIS results for 169.254.78.64
NetRange:       169.254.0.0 - 169.254.255.255
CIDR:           169.254.0.0/16
NetName:        LINKLOCAL-RFC3927-IANA-RESERVED
NetHandle:      NET-169-254-0-0-1
Parent:         NET169 (NET-169-0-0-0-0)
NetType:        IANA Special Use
OriginAS:
Organization:   Internet Assigned Numbers Authority (IANA)
RegDate:        1998-01-27
Updated:        2014-01-09
Comment:        Computers use addresses starting with "169.254." when they do not have a manually configured address or when they are not told which address to use by a service on the network.  They are commonly called the "link local" addresses.
Comment:
Comment:        Routers are not allowed to forward packets sent from an IPv4 "link local" address, so they are always used by a directly connected device.
Comment:
Comment:        These addresses were assigned by the IETF, the organization that develops Internet protocols, in the Standards Track document, RFC3927, which can be found at:
Comment:        http://datatracker.ietf.org/doc/rfc3927
Ref:            http://whois.arin.net/rest/net/NET-169-254-0-0-1

所以这不是什么大问题。接口是promiscuous，这意味着它将接收所有数据包。

要查看哪些进程已打开它，man lsof将会sudo lsof /dev/eth1有所帮助。

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