Smtp Redirection; Enabling External Guest Services - SonicWALL SonicPoint Administrator's Manual

SMTP Redirection

In a hotspot or hospitality environment, users with variously configured SMTP settings will visit, and
will expect the same network experience as they have at home or at work. An obstacle to this sort of
transparency is the fact that many ISP's only allow connections to their SMTP servers from source IP
addresses that fall into their own ranges of IP addresses. This security mechanism, or the much more
prevalent (although unfortunately not yet ubiquitous) prevention of SMTP relaying will prevent hotspot
users from sending e-mail using SMTP when connecting from the IP address of the hotspot provider.
To solve this problem, SMTP Redirection intercepts and translates all outbound SMTP (TCP port 25)
traffic to a server that can be defined by the hotspot operator. This server is then be used to send
outbound e-mail for all hotspot visitors, regardless of their client software configurations.
Note: The potential for using this sort of arrangement for spamming must be mitigated by anti-spam
software running on the mail server, or on some security (anti-spam) gateway or appliance.

Enabling External Guest Services

In addition to providing the ability to accept non-SonicWALL wireless traffic, disabling SonicPoint
enforcement has the additional benefit of being able to provide Wireless Guest Services (WGS) to
wired hosts. All features of WGS function for wired guests exactly as they do for wireless guests,
including authentication page redirection and Lightweight Hotspot Messaging, and DAT.
To configure guest services for wireless, click on the Enable External Guest Authentication checkbox.
This enables external authentication if you are configuring from a centralized point if you want all
remote sites to connect to one central management server.,
Note: For more details, see Lightweight Hotspot Messaging documentation available on
http://www.sonicwall.com/support/sohotzw_documentation.html
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