本文记录了OpenStack Neutron DHCP Agent在运行过程中出现的报错情况，包括错误日志分析、配置文件对比及调整、网络参数检查等过程，最终定位问题为MTU设置不当导致的数据包超长问题。
服务已经起来了，居然报错！！！
[root@openstack01 neutron]# openstack network agent list
+--------------------------------------+--------------------+-------------+-------------------+-------+-------+---------------------------+
| ID | Agent Type | Host | Availability Zone | Alive | State | Binary |
+--------------------------------------+--------------------+-------------+-------------------+-------+-------+---------------------------+
| 2608fa24-3614-4830-b235-61fa82a84f8c | Linux bridge agent | openstack01 | None | :-) | UP | neutron-linuxbridge-agent |
| 9e8afc78-d8d1-4de7-a46e-08b6eeb5b259 | Metadata agent | openstack01 | None | :-) | UP | neutron-metadata-agent |
| efb46ffd-e2ae-4319-bb35-bdfa6caf1fc7 | DHCP agent | openstack01 | nova | :-) | UP | neutron-dhcp-agent |
+--------------------------------------+--------------------+-------------+---------------
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