Thank you Alan and Alan, it worked. :)
# radtest -t mschap viola password localhost 0 key
Sending Access-Request of id 67 to 127.0.0.1 port 1812
User-Name = "viola"
NAS-IP-Address = x.x.x.x
NAS-Port = 0
Message-Authenticator = 0x00000000000000000000000000000000
MS-CHAP-Challenge = 0xb8aa006ef4040d71
MS-CHAP-Response =
0x000100000000000000000000000000000000000000000000000037cfefe932713bd369dc9bbaa3e35b25d2316e83ae73db95
rad_recv: Access-Accept packet from host 127.0.0.1 port 1812, id=67,
length=84
MS-CHAP-MPPE-Keys =
0x0000000000000000493adff9cf9839a289e3c19d21c8a4310000000000000000
MS-MPPE-Encryption-Policy = 0x00000002
MS-MPPE-Encryption-Types = 0x00000006
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