: Often visible in the PPP configuration or CHAP response. Peer Challenge : The 16-byte random value from the client.

Look for the MS-CHAPv2 authentication sequence. In Wireshark, you can filter for ppp.protocol == 0xc223 . You are looking for three specific packets: Challenge : The server sends a random nonce to the client.

: The client sends its username and a hashed response (NT-Response). Success/Failure : Confirms if the credentials were correct.

: The entire authentication exchange (challenges and responses) is sent in the clear, allowing an eavesdropper to capture the data needed for offline cracking.

: MS-CHAPv2 relies on the DES algorithm, which is susceptible to brute-force attacks.

: The 16-byte random value from the server.