I First found in version
S5600-CMW310-R1510P16.
II The version(s) already found this problem
S5600-CMW310-R1510P16.
III Description of the problem
PC is authenticated by authentication server through NAS. After authenticated successfully, the PC performs the operation of ping.PC may fail to ping NAS, and it succeeds to ping authentication server.
IV Solution
Update to version S5600-CMW310-R1510P20.