Service Passthrough - peplink Balance One User Manual

USER MANUAL
Peplink Balance Series
21.4.3 DNS Forwarding
When DNS Forwarding is enabled, all clients' outgoing DNS requests will also be intercepted and
forwarded to the built-in DNS proxy server.

Service Passthrough

Service Passthrough settings can be found at:Network >Misc. Settings> Service Passthrough
Some Internet services need to be specially handled in a multi-WAN environment.The Peplink Balance
can handlethese services such that Internet applications do not notice it is behind a multi-WAN router.
Settings for Service Passthrough Support are available here.
Session Initiation Protocol, aka SIP, is a voice-over-IP protocol. The Peplink Balance can
act as a SIP Application Layer Gateway (ALG) which binds connections for the same SIP
session to the same WAN connection and translate IP address in the SIP packets
SIP correctly in NAT mode. Such passthrough support is always enabled and there are two
modes for selection: Standard Mode and Compatibility Mode
If your SIP server's signal port number is non-standard, you can check the box Define
custom signal ports and input the port numbers to the text boxes.
With this option enabled, protocols that provide audio-visual communication sessions will
H.323
be defined on any packet network and passthrough the Balance.
FTP sessions consist of two TCP connections; one for control and one for data. In multi-
WAN situation, they have to be routedto the same WAN connection. Otherwise,
problems will arise in transferring files. By default, the Peplink Balance monitors TCP
control connections on port 21 for any FTP connections and binds TCP connections of
FTP
the same FTP session to the same WAN.
If you have an FTP server listening on a port number other than 21, you can check the
box Define custom control ports and enter the port numbers to the text boxes.
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