
AP-5131 Access Point Product Reference Guide
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Default 
Authentication 
Type
Specify a PEAP and/or TTLS Authentication Type for EAP to use 
from the drop-down menu to the right of each checkbox item. 
PEAP options include:
•GTC - EAP Generic Token Card (GTC) is a challenge 
handshake authentication protocol using a hardware token 
card to provide the response string.
• MSCHAP-V2 - Microsoft CHAP (MSCHAP-V2) is an encrypted 
authentication method based on Microsoft's challenge/
response authentication protocol. 
TTLS options include:
•PAP - Password Authentication Protocol sends a username 
and password over a network to a server that compares the 
username and password to a table of authorized users. If the 
username and password are matched in the table, server 
access is authorized. WatchGuard products do not support 
the PAP protocol because the username and password are 
sent as clear text that a hacker can read.
• MD5 - This option enables the MD5 algorithm for data verification. MD5 takes as input a message of arbitrary length and produces a 128- bit fingerprint. The MD5 algorithm is intended for digital signature applications, in which a large file must be compressed in a secure manner before being encrypted with a private (secret) key under a public-key cryptographic system.• MSCHAP-V2 - Microsoft CHAP (MSCHAP-V2) is an encrypted 
authentication method based on Microsoft's challenge/
response authentication protocol. 
Server Certificate If you have a server certificate from a CA and wish to use it on the 
Radius server, select it from the drop-down menu. Only certificates 
imported to the AP-5131 are available in the menu.For information 
on creating a certificate, see Creating Self Certificates for 
Accessing the VPN on page 4-10.
CA Certificate You can also choose an imported CA Certificate to use on the 
Radius server. If using a server certificate signed by a CA, import 
that CA's root certificate using the CA certificates screen (for 
information, see Importing a CA Certificate on page 4-9). After a 
valid CA certificate has been imported, it is available from the CA 
Certificate drop-down menu.