IT博客汇 | Linux Network：静态分配IP，遭遇“Determining if ip address xxx is already in use for device xxx”

Linux Network：静态分配IP，遭遇“Determining if ip address xxx is already in use for device xxx”

Adamhuan发表于 2016-07-06 01:54:00

如题所示，具体的问题如下图所示：
ip_already_in_use_1

关于这个问题，有可能是以下两种原因造成的：
1. 你的网络里真的有一台服务器的IP，跟你当前期望的IP冲突。
2. 你的本地机器曾经配置过你期望的IP。

解决方法有很多种：
一、注释：ifup-eth

修改ifup-eth之前，先做备份：

[root@PRODUCT42 ~]# mkdir /backup
[root@PRODUCT42 ~]# cp /etc/sysconfig/network-scripts/ifup-eth /backup/
[root@PRODUCT42 ~]# 
[root@PRODUCT42 ~]# cat /etc/sysconfig/network-scripts/ifup-eth | wc -l
323
[root@PRODUCT42 ~]# 
[root@PRODUCT42 ~]#

然后，如下图所示：
ip_already_in_use_2
注释掉，包含：
net_log $”Error, some other host ($ARPINGMAC) already uses address ${ipaddr[$idx]}.”
的那一小段：if … fi，的代码段。

然后，重启网卡，就不会遇到文首截图中所遇到的问题了：

[root@PRODUCT42 ~]# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:50:56:AA:54:87  
          inet6 addr: fe80::250:56ff:feaa:5487/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:227319 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1186 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:33744807 (32.1 MiB)  TX bytes:302184 (295.1 KiB)

eth1      Link encap:Ethernet  HWaddr 00:50:56:AA:28:C2  
          inet addr:192.168.3.31  Bcast:192.168.3.255  Mask:255.255.255.0
          inet6 addr: fe80::250:56ff:feaa:28c2/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:27309 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2020 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:1759553 (1.6 MiB)  TX bytes:224418 (219.1 KiB)

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:2580 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2580 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:198944 (194.2 KiB)  TX bytes:198944 (194.2 KiB)

[root@PRODUCT42 ~]# 
[root@PRODUCT42 ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth0 
DEVICE=eth0
TYPE=Ethernet
UUID=ba4466c2-fd24-484c-bb40-71a98a8b67eb
ONBOOT=yes
NM_CONTROLLED=no
BOOTPROTO=none
HWADDR=00:50:56:AA:54:87
PREFIX=24
DEFROUTE=yes
IPV4_FAILURE_FATAL=yes
IPV6INIT=no
NAME="System eth0"
LAST_CONNECT=1467738912
IPADDR=192.168.0.41
NETMASK=255.255.255.0
GATEWAY=192.168.0.1
[root@PRODUCT42 ~]# 
[root@PRODUCT42 ~]# ifdown eth0
[root@PRODUCT42 ~]# 
[root@PRODUCT42 ~]# ifup eth0
Determining if ip address 192.168.0.41 is already in use for device eth0...
[root@PRODUCT42 ~]# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:50:56:AA:54:87  
          inet addr:192.168.0.41  Bcast:192.168.0.255  Mask:255.255.255.0
          inet6 addr: fe80::250:56ff:feaa:5487/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:228195 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1336 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:33871362 (32.3 MiB)  TX bytes:311622 (304.3 KiB)

eth1      Link encap:Ethernet  HWaddr 00:50:56:AA:28:C2  
          inet addr:192.168.3.31  Bcast:192.168.3.255  Mask:255.255.255.0
          inet6 addr: fe80::250:56ff:feaa:28c2/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:27856 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2252 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:1800693 (1.7 MiB)  TX bytes:249555 (243.7 KiB)

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:2730 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2730 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:215756 (210.6 KiB)  TX bytes:215756 (210.6 KiB)

[root@PRODUCT42 ~]#

如果，你连：
Determining if ip address 192.168.0.41 is already in use for device eth0…
这个告警信息都不想看到，你可以注释得更彻底一点：
ip_already_in_use_3

二、清理ARP列表。

[root@PRODUCT42 ~]# arp -n
Address                  HWtype  HWaddress           Flags Mask            Iface
192.168.0.21             ether   c8:1f:66:c7:4b:8f   C                     eth0
192.168.3.1              ether   f8:c2:88:1b:20:cd   C                     eth1
[root@PRODUCT42 ~]# 
[root@PRODUCT42 ~]# arp -d 192.168.0.21
[root@PRODUCT42 ~]# 
[root@PRODUCT42 ~]# arp -n
Address                  HWtype  HWaddress           Flags Mask            Iface
192.168.0.21                     (incomplete)                              eth0
192.168.3.1              ether   f8:c2:88:1b:20:cd   C                     eth1
[root@PRODUCT42 ~]#

注意，ARP清理，是将列表条目标记为：(incomplete)，并等待下次Linux系统的垃圾清理，予以清除。

三、禁用ARP检查：

[root@PRODUCT42 ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth0 | grep --color ARPCHECK
ARPCHECK=no
[root@PRODUCT42 ~]#

——————————————
Done。