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8: Device Ports
SLC™ 8000 Advanced Console Manager User Guide 153
Dial-back
The SLC advanced console manager waits for a peer to call the SLC unit, establishes a text
(command line) or PPP connection, authenticates the user, and if the SLC 8000 advanced console
manager is able to determine a dial-back number to use, hangs up and calls the dial-back number
to establish either a text or PPP connection.
For text connections, the user will be prompted for a login and password, and will be
authenticated via the currently enabled authentication methods (Local Users, NIS, LDAP, etc).
The site list will be searched for a site that (a) the Login/CHAP Host matches the name that
was authenticated, (b) Authentication is set to PAP, and (c) the Port is set to None or
matches the port the modem is on.
If a matching site is found, its Timeout Logins, Dial-back Number, Allow Dial-back, and
Dial-back Delay parameters will be used for the rest of the dial-back connection instead of the
parameters configured for the modem. Once the remote server is authenticated, if Allow Dial-
back is enabled for the site and a Dial-back Number is defined, the SLC unit will hang up and
wait Dial-back Delay seconds before initiating the dial-back. The SLC 8000 advanced
console manager will dial, prompt the user again for a login and password, and a CLI session
will be initiated. The user will remain connected to the SLC unit until they either logout of the
CLI session, or (if Timeout Logins is enabled) the CLI session is terminated if it has been
idle.
For PPP connections, the user will be authenticated via PAP or CHAP (determined by the
Authentication setting for the modem). For PAP, the Local/Remote User list will be used to
authenticate the login and password sent by the PPP peer, and the site list will be searched for
a site that (a) the Login/CHAP Host matches the name that was authenticated, (b)
Authentication is set to PAP, and (c) the Port is set to None or matches the port the modem
is on. For CHAP, the site list will be searched for a site that (a) the Login/CHAP Host and
CHAP Secret match the name and secret sent in the CHAP Challenge response by the PPP
peer, (b) Authentication is set to CHAP, and (c) the Port is set to None or matches the port
the modem is on. If the remote peer requests PAP or CHAP authentication from the SLC 8000
advanced console manager, the Remote/Dial-out Login and Remote/Dial-out Password
configured for the modem (not the site) will be provided as authentication tokens.
If a matching site is found, its Dial-back Number, Allow Dial-back, Dial-back Delay, Dial-
out Login, Dial-out Password, Negotiate IP Address, NAT, and Modem Timeout
parameters will be used for the rest of the dial-back connection instead of the parameters
configured for the modem. Once the remote server is authenticated, if Allow Dial-back is
enabled for the site and a Dial-back Number is defined, the SLC unit will will hang up and wait
Dial-back Delay seconds before initiating the dial-back. The SLC 8000 advanced console
manager will dial, and if the remote peer requests PAP or CHAP authentication, provide the
Dial-out Login and Dial-out Password as authentication tokens. Once authenticated, a PPP
session will be established using either negotiated IP addresses or specific IP addresses
(determined by the Negotiate IP Address setting).
Dial-on-demand
The SLC unit automatically dial outs and establishes a PPP connection when IP traffic destined for
a remote network needs to be sent. It will remain connected until no data packets have been sent
to the peer for a specified amount of time.
When this modem state is initiated, the SLC 8000 advanced console manager searches the site
list for all sites that (a) have a Dial-out Number defined, (b) have a Static Route IP Address,
Static Route Subnet Mask and Static Route Gateway defined, and (c) the Port matches the port
the modem is on. A dial-on-demand connection will be started for each, waiting for IP traffic
destined for a remote network.
When IP traffic needs to be sent, the SLC unit dials the appropriate Dial-out Number for the site,