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4. Serial Port, Host, Device and User Configuration
4.11.6 Caveats
Some downstream routers may be incompatible with the gateway route. 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 interpret this as a “single host route”
on the interface, but as this is an unusual setting for Ethernet, some older downstream devices may encounter 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: Dial-Out/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). There is a minor 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 and at the same time where they
have randomly chosen the same originating local port number.
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