在分支站点部署 ION 后，通过无线控制器进行 Radius 身份验证失败
3520
Created On 05/17/24 22:17 PM - Last Modified 01/07/25 05:58 AM
Symptom
- 在分支站点部署 ION 后，通过无线控制器进行 Radius 身份验证失败
- 数据包捕获中没有来自 RADIUS 服务器的接受消息
- The packet length of the challenge message from the radius server is greater than 1300
0:43:23.603752 IP 10.218.110.50.1812 > 10.214.0.60.32771: RADIUS, Access-Challenge (11), id: 0x96 length: 1390 20:43:25.200062 IP 10.214.0.60.32774 > 10.218.110.50.1812: RADIUS, Access-Request (1), id: 0xc8 length: 444 20:43:25.203379 IP 10.218.110.50.1812 > 10.214.0.60.32774: RADIUS, Access-Challenge (11), id: 0xc8 length: 1390
Environment
- Prisma 软件定义广域网
- 思科无线控制器
- Radius 身份验证
Cause
- 当数据包长度大于 1300 时，ION 会对数据包进行分片
- 此碎片会破坏 Radius 身份验证
Resolution
将分支站点的 Cisco 无线控制器上的 MTU 大小减小到小于或等于 1000
Additional Information
After setting MTU to 1000 on the wireless controller Access-challenge packets are lesser in length
0:45:56.104219 IP 10.218.110.50.1812 > 10.214.0.60.32773: RADIUS, Access-Challenge (11), id: 0xee length: 90 20:45:56.141801 IP 10.214.0.60.32773 > 10.218.110.50.1812: RADIUS, Access-Request (1), id: 0xef length: 441 20:45:56.155349 IP 10.218.110.50.1812 > 10.214.0.60.32773: RADIUS, Access-Challenge (11), id: 0xef length: 1188 20:45:56.185041 IP 10.214.0.60.32773 > 10.218.110.50.1812: RADIUS, Access-Request (1), id: 0xf0 length: 286