Comtech EF Data CDM-570A Installation And Operation Manual page 609

Step Action
1 The User PC transmits the "HTTP GET" request.
Upon receiving the "HTTP GET" request, the CDM-570A/570AL checks whether the user has been
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authenticated. If not, the CDM-570A/570AL returns "HTTP 401 Unauthorized" message to the User PC.
3 The User PC transmits the login credentials to the CDM-570A/570AL using the "HTTP GET" message.
4 The CDM-570A/570AL receives the login credentials and performs the following steps:
A. It validates the login credentials against the locally stored Admin credentials. If the credentials match,
the modem allows Read/Write access (including Admin configuration pages); it does not grant
RADIUS access.
B. If there is no match for the system user credentials, then the modem transmits the RADIUS: Access-
Request message to the Primary RADIUS Server.
C. If the Primary RADIUS Server is not available, then the modem transmits the RADIUS: Access-
Request message to the Secondary RADIUS Server.
D. If the Secondary RADIUS Server is not available, then the modem transmits the HTTP: Access
Denied message (error page) to the User PC.
5 The RADIUS Server, upon receiving the RADIUS:Access-Req message, authenticates the user credentials
and does one of the following:
A. It transmits the RADIUS: Access-Accept message with the appropriate user access level – e.g.,
Read-only or Read/Write.
B. It transmits the RADIUS:Access-Reject message upon credential mismatch.
C. It transmits the RADIUS: Access-Challenge for further validation.
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The CDM-570A/570AL, upon receiving one of the above responses from the RADIUS server, then does one
of the following:
A. Upon receiving the RADIUS:Access-Accept message, it transmits the "HTTP 201 OK" message to
the User PC.
B. Upon receiving the RADIUS: Accept-Reject message, it transmits the "Access Denied" message to
the User PC.
C. Upon receiving the RADIUS: Access-Challenge message, it transmits the "PAP/CHAP challenge
response" message to the Radius Server.
Upon receiving the "HTTP 201 OK" message, the user can browse the CDM-570A/570AL HTTP (Web
Server) Interface pages.
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RADIUS Client
CDM-570A/570AL Satellite Modem with Optional Packet Processor
Depending on the user access rights received from the RADIUS server, the CDM-
570A/570AL allows the user Read-only or Read-Write access to the interface.
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Revision 5
MN-CDM570A