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after selecting ​ Enable ​ .
DNS Forwarding
When this option is enabled, all outgoing DNS lookups will be intercepted and
redirected to the built-in DNS name server. If any LAN device is using the DNS name
servers of a WAN connection, you may want to enable this option to enhance the
DNS availability without modifying the DNS server setting of the clients. The built-in
DNS name server will distribute DNS lookups to corresponding DNS servers of all
available WAN connections. In this case, DNS service will not be interrupted, even if
any WAN connection is down.
Custom Service
Forwarding
When custom service forwarding is enabled, outgoing traffic with the specified TCP
port will be forwarded to a local or remote server by defining its IP address and port
number.
21.4.1 SMTP Forwarding
Some ISPs require their users to send e-mails via the ISP’s SMTP server. All outgoing SMTP
connections are blocked except those connecting to the ISP’s. Pepwave routers support
intercepting and redirecting all outgoing SMTP connections (destined for TCP port 25) via a
WAN connection to the WAN’s corresponding SMTP server.
To enable the feature, select ​ Enable ​ under ​ SMTP Forwarding Setup ​ . Check ​ Enable
Forwarding ​ for the WAN connection(s) that needs forwarding. Under ​ SMTP Server ​ , enter the
ISP’s e-mail server host name or IP address. Under
​
SMTP Port
​
, enter the TCP port number
for each WAN.
The Pepwave router will intercept SMTP connections. Choose a WAN port according to the
outbound policy, and then forward the connection to the SMTP server if the chosen WAN has
enabled forwarding. If the forwarding is disabled for a WAN connection, SMTP connections for
the WAN will be simply be forwarded to the connection’s original destination.
Note
If you want to route all SMTP connections only to particular WAN connection(s), you should create a custom rule
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