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4.13.4 Service Intercepts
These allow the console server to continue to provide services for e.g. out-of-band management when in
IP Passthrough mode. Connections to the modem address on the specified intercept port(s) will be
handled by the Console server, rather than being passed through to the downstream router.
For the required service of HTTP, HTTPS or SSH, check Enable.
Optionally modify the Intercept Port to an alternate port (e.g. 8443 for HTTPS), this is useful if
you want to continue to allow the downstream router to remain accessible via its regular port.
4.13.5 IP Passthrough Status
Refresh the page to view the Status section. It displays the modem’s External IP Address being passed
through, the Internal MAC Address of the downstream router (only populated when the downstream
router accepts the DHCP lease), and the overall running status of the IP Passthrough service.
Additionally, you may be alerted to the failover status of the downstream router by configuring a Routed
Data Usage Check under Alerts & Logging: Auto-Response.
4.13.6 Caveats
Some downstream routers may be incompatible with the gateway router. This may happen when IP
Passthrough is bridging a 3G cellular network where the gateway address is a point-to-point destination
address and no subnet information is available. The console server sends a DHCP netmask of
255.255.255.255. Devices will normally correctly construe this as a "single host route" on the interface,
but as this is an unusual setting for Ethernet, some older downstream devices may have issues.
Intercepts for local services will not work if the console server is using a default route other than the
modem. As per normal operation, they will also not work unless the service is enabled and access to the
service is enabled (see System: Services: Service Access: Dialout/Cellular).
Outbound connections originating from the console server to remote services are supported (e.g. sending
SMTP email alerts, SNMP traps, getting NTP time, IPSec tunnels); however, there is a miniscule risk of
connection failure should both the Console server and the downstream device try to access the same
UDP or TCP port on the same remote host at the same time where they have randomly chosen the same
originating local port number.
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