我的服务器的一个物理接口 eno3 是网桥 br0 的一部分。还有一台 LXD 机器连接到此网桥（nictype=bridged，parent=br0）。
有时 ARP 会完全停止运行。如果我查看网桥 br0 上的流量捕获，我会看到来自服务器和 VM 的大量 ARP 请求，但根本没有响应。这仅影响 IPv4。
重新启动连接到 eno3 的交换机没有帮助。使用“ip link”关闭并重新启动 br0 也没有帮助。使用“ip link”关闭并重新启动 eno3 确实解决了问题，之后一切都正常了！
$ uname -a
Linux xxx 5.4.0-90-generic #101-Ubuntu SMP Fri Oct 15 20:00:55 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
$ lspci -nn
05:00.0 Ethernet controller [0200]: Intel Corporation I210 Gigabit Network Connection [8086:1533] (rev 03)
06:00.0 Ethernet controller [0200]: Intel Corporation I210 Gigabit Network Connection [8086:1533] (rev 03)
07:00.0 Ethernet controller [0200]: Intel Corporation I210 Gigabit Network Connection [8086:1533] (rev 03)
nics 使用 igb 驱动程序。
以下是系统处于失败的状态。
# ip -br link
lo UNKNOWN 00:00:00:00:00:00 <LOOPBACK,UP,LOWER_UP>
eno1 UP 0c:c4:7a:7b:8f:28 <BROADCAST,MULTICAST,UP,LOWER_UP>
eno2 DOWN 0c:c4:7a:7b:8f:29 <BROADCAST,MULTICAST>
eno3 UP 0c:c4:7a:7b:8f:2a <BROADCAST,MULTICAST,UP,LOWER_UP>
br0 UP 0c:c4:7a:7b:8f:2a <BROADCAST,MULTICAST,UP,LOWER_UP>
sec@eno3 UP 0c:c4:7a:7b:8f:2a <BROADCAST,MULTICAST,UP,LOWER_UP>
guest@eno3 UP 0c:c4:7a:7b:8f:2a <BROADCAST,MULTICAST,UP,LOWER_UP>
iot@eno3 UP 0c:c4:7a:7b:8f:2a <BROADCAST,MULTICAST,UP,LOWER_UP>
veth4961922d@if10 UP ce:1a:33:2f:83:e4 <BROADCAST,MULTICAST,UP,LOWER_UP>
vpnnet0@if12 UP 56:e8:ff:f8:fe:0b <BROADCAST,MULTICAST,UP,LOWER_UP>
# ip -4 -br address
lo UNKNOWN 127.0.0.1/8
eno1 UP 192.168.178.2/24
br0 UP 192.168.1.1/24
sec@eno3 UP 192.168.30.1/24
guest@eno3 UP 192.168.10.1/24
iot@eno3 UP 192.168.20.1/24
vpnnet0@if12 UP 192.168.2.1/24
# ip route
default via 192.168.178.1 dev eno1 proto static
192.168.1.0/24 dev br0 proto kernel scope link src 192.168.1.1
192.168.2.0/24 dev vpnnet0 proto kernel scope link src 192.168.2.1
192.168.10.0/24 dev guest proto kernel scope link src 192.168.10.1
192.168.20.0/24 dev iot proto kernel scope link src 192.168.20.1
192.168.30.0/24 dev sec proto kernel scope link src 192.168.30.1
192.168.50.0/24 via 192.168.2.2 dev vpnnet0 proto static
192.168.178.0/24 dev eno1 proto kernel scope link src 192.168.178.2
# ip -4 neigh
192.168.1.125 dev br0 FAILED
192.168.1.148 dev br0 FAILED
192.168.10.171 dev guest FAILED
192.168.178.227 dev eno1 FAILED
192.168.1.95 dev br0 lladdr 74:ac:b9:66:a9:7b STALE
192.168.20.106 dev iot lladdr b8:27:eb:50:68:5f STALE
192.168.1.6 dev br0 lladdr 00:16:3e:92:18:81 DELAY
192.168.178.42 dev eno1 FAILED
192.168.10.181 dev guest FAILED
192.168.1.94 dev br0 lladdr d8:07:b6:88:42:1e STALE
192.168.178.23 dev eno1 FAILED
192.168.1.127 dev br0 FAILED
192.168.1.150 dev br0 FAILED
192.168.1.101 dev br0 FAILED
192.168.20.50 dev iot FAILED
192.168.10.100 dev guest lladdr 80:2a:a8:99:83:a0 STALE
192.168.1.212 dev br0 FAILED
192.168.10.157 dev guest lladdr 74:ac:b9:66:a9:7b STALE
192.168.1.245 dev br0 FAILED
192.168.30.10 dev sec INCOMPLETE
192.168.20.51 dev iot FAILED
192.168.178.27 dev eno1 FAILED
192.168.10.111 dev guest lladdr 78:8a:20:4b:9a:c8 STALE
192.168.178.17 dev eno1 FAILED
192.168.1.70 dev br0 FAILED
192.168.1.226 dev br0 FAILED
192.168.1.9 dev br0 INCOMPLETE
192.168.1.2 dev br0 FAILED
192.168.1.108 dev br0 lladdr 00:17:c8:b6:e7:85 STALE
192.168.1.8 dev br0 FAILED
192.168.10.140 dev guest FAILED
192.168.1.97 dev br0 lladdr 14:59:c0:55:18:0a STALE
192.168.1.111 dev br0 FAILED
192.168.1.96 dev br0 FAILED
192.168.1.211 dev br0 FAILED
192.168.1.10 dev br0 FAILED
192.168.1.99 dev br0 lladdr 80:2a:a8:99:83:a0 STALE
192.168.10.173 dev guest FAILED
192.168.20.111 dev iot FAILED
192.168.1.5 dev br0 FAILED
192.168.2.2 dev vpnnet0 lladdr 00:16:3e:7c:69:e0 REACHABLE
192.168.1.60 dev br0 FAILED
192.168.1.161 dev br0 FAILED
192.168.178.1 dev eno1 lladdr 48:d3:43:a0:58:58 REACHABLE
192.168.1.219 dev br0 FAILED
192.168.1.119 dev br0 FAILED
知道发生什么事了吗？
编辑：当系统处于故障状态时，更新命令输出。
提前致谢！