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Ubuntu Server 22.04 有两个 IP 地址

tag-icon • tag-icon networking server 22.04 netplan static-ip
Ubuntu Server 22.04 有两个 IP 地址

我的 Ubuntu 服务器在 LAN (eth0) 上一天有两个 IPv4 地址。可能是更新时发生了这种情况。我将其用作 WordPress 的 Web 服务器和 Pi-Hole 的本地 DNS。所有服务均正常运行。登录时的系统信息：

 Welcome to Ubuntu 22.04.2 LTS (GNU/Linux 5.15.0-1024-raspi aarch64)
 
  * Documentation:  https://help.ubuntu.com  * Management:    
 https://landscape.canonical.com  * Support:       
 https://ubuntu.com/advantage
 
   System information as of Wed Feb 22 17:28:28 CET 2023
 
   System load:  0.1796875           Processes:             168   Usage
 of /:   12.0% of 234.32GB   Users logged in:       0   Memory usage:
 27%                 IPv4 address for eth0: 169.254.99.100   Swap
 usage:   0%                  IPv4 address for eth0: 192.168.7.100  
 Temperature:  34.1 C
 
  * Strictly confined Kubernetes makes edge and IoT secure. Learn how
 MicroK8s    just raised the bar for easy, resilient and secure K8s
 cluster deployment.
 
    https://ubuntu.com/engage/secure-kubernetes-at-the-edge
 
  * Introducing Expanded Security Maintenance for Applications.   
 Receive updates to over 25,000 software packages with your    Ubuntu
 Pro subscription. Free for personal use.
 
      https://ubuntu.com/pro
 
 Expanded Security Maintenance for Applications is not enabled.
 
 0 updates can be applied immediately.
 
 3 additional security updates can be applied with ESM Apps. Learn more
 about enabling ESM Apps service at https://ubuntu.com/esm

静态IP192.168.7.100设置/etc/netplan/50-cloud-init.yaml 为该文件夹中没有其他*yaml 文件。

Netplan 设置：

network:
    ethernets:
        eth0:
            link-local: [ ipv4 ]
            addresses:
            - 192.168.7.100/24
            dhcp4: false
            nameservers:
                addresses:
                - 192.168.7.1
                - 8.8.8.8
            routes:
              - to: default
                via: 192.168.7.1
    version: 2

为什么我的服务器有第二个 IPv4169.254.99.100是否可以删除这个第二个 IP？

ip route和的结果ip a：

alexadmin@ubuntuserver:/etc/netplan$ ip route
default via 192.168.7.1 dev eth0 proto static 
169.254.0.0/16 dev eth0 proto kernel scope link src 169.254.99.100 metric 2048 
192.168.7.0/24 dev eth0 proto kernel scope link src 192.168.7.100 
alexadmin@ubuntuserver:/etc/netplan$ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether dc:a6:32:a5:6f:be brd ff:ff:ff:ff:ff:ff
    inet 169.254.99.100/16 metric 2048 brd 169.254.255.255 scope link eth0
       valid_lft forever preferred_lft forever
    inet 192.168.7.100/24 brd 192.168.7.255 scope global eth0
       valid_lft forever preferred_lft forever
3: wlan0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ether dc:a6:32:a5:6f:bf brd ff:ff:ff:ff:ff:ff

在 netplan 中删除后link-local: [ ipv4 ]，结果为ip a：

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether dc:a6:32:a5:6f:be brd ff:ff:ff:ff:ff:ff
    inet 192.168.7.100/24 brd 192.168.7.255 scope global eth0
       valid_lft forever preferred_lft forever
    inet6 fd35:2cf:f17a:4a41:dea6:32ff:fea5:6fbe/64 scope global dynamic mngtmpaddr noprefixroute 
       valid_lft 1741sec preferred_lft 1741sec
    inet6 fe80::dea6:32ff:fea5:6fbe/64 scope link 
       valid_lft forever preferred_lft forever
3: wlan0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ether dc:a6:32:a5:6f:bf brd ff:ff:ff:ff:ff:ff

答案1

在您的 netplan 文件中，您包括：

link-local: [ ipv4 ]

结果是您收到了通常的链接本地 IPv4 地址 169.254.xy 我建议您删除该行。您不再拥有 IPv4 链接本地地址：

eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether dc:a6:32:a5:6f:be brd ff:ff:ff:ff:ff:ff
    inet 192.168.7.100/24 brd 192.168.7.255 scope global eth0
       valid_lft forever preferred_lft forever
etc.

如果您对您的 IPv6 地址还有其他疑问，请提出新问题。

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