CentOS 7使用错误的MAC地址回复ARP

我最近遇到了奇怪的问题，我的CentOS机器（让我们称之为服务器） . 服务器的IP地址为10.150.39.5 . 问题在于它回复了具有两个MAC地址的ARP请求，而最后一个请求中断了与服务器的所有通信 .

镜像交换机端口上的tcpdump输出：

18:02:01.388595 00:00:00:e5:64:32 > 00:00:00:67:1d:ea, ethertype ARP (0x0806), length 60: Request who-has 10.150.39.5 (00:00:00:67:1d:ea) tell 10.150.39.116, length 46
18:02:01.388600 00:00:00:67:1d:ea > 00:00:00:e5:64:32, ethertype ARP (0x0806), length 60: Reply 10.150.39.5 is-at 00:00:00:67:1d:ea, length 46
18:02:01.388743 00:00:00:67:1d:ec > 00:00:00:e5:64:32, ethertype ARP (0x0806), length 60: Reply 10.150.39.5 is-at 00:00:00:67:1d:ec, length 46

最有趣的是当我在服务器NIC上进行捕获时 - 我只看到前两个数据包（正常ARP请求和ARP resp） . 所以我创建了一个网络SPAN（镜像来自交换机接口的所有流量，服务器连接到其他机器），在该镜像端口上，我看到我之前粘贴的数据包 .

我100％确定它不是MiTM攻击，因为它是连接到接口的一个物理服务器，并且在我在该端口上实现了端口安全性之后（只允许正确的MAC进入）问题就消失了 . 所以基本上我不再有问题了，但我非常希望找到原因 .

以下是您想要帮助我的两个输出可能会派上用场：

[root@server ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1
    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: enp0s25: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:00:00:67:1d:ea brd ff:ff:ff:ff:ff:ff
    inet 10.150.39.5/24 brd 10.150.39.255 scope global enp0s25
       valid_lft forever preferred_lft forever
    inet6 fe80::219:d1ff:fe67:1dea/64 scope link 
       valid_lft forever preferred_lft forever
3: enp1s0f0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:00:00:e3:ca:82 brd ff:ff:ff:ff:ff:ff
4: enp1s0f1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:00:00:e3:ca:83 brd ff:ff:ff:ff:ff:ff

[root@server ~]# tail -vn +1 /etc/sysconfig/network-scripts/ifcfg-*
==> /etc/sysconfig/network-scripts/ifcfg-enp0s25 <==
TYPE="Ethernet"
BOOTPROTO="static"
UUID="a04fb9bd-0543-4ba6-bd17-72cc3d9f54cc"
DEVICE="enp0s25"
ONBOOT="yes"
IPADDR=10.150.39.5
NETMASK=255.255.255.0
GATEWAY=10.150.39.1

==> /etc/sysconfig/network-scripts/ifcfg-enp1s0f0 <==
TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=dhcp
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
NAME=enp1s0f0
UUID=64e7544d-54b9-40cc-83f0-7e10acbcdeaa
DEVICE=enp1s0f0
ONBOOT=no

==> /etc/sysconfig/network-scripts/ifcfg-enp1s0f1 <==
TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=dhcp
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
NAME=enp1s0f1
UUID=c3085e08-1e14-4098-b77a-b512a2c99e75
DEVICE=enp1s0f1
ONBOOT=no

==> /etc/sysconfig/network-scripts/ifcfg-lo <==
DEVICE=lo
IPADDR=127.0.0.1
NETMASK=255.0.0.0
NETWORK=127.0.0.0
# If you're having problems with gated making 127.0.0.0/8 a martian,
# you can change this to something else (255.255.255.255, for example)
BROADCAST=127.255.255.255
ONBOOT=yes
NAME=loopback