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The built-in modem can be set up to enable DHCP relay via the AT commands:
- To enter the AT command interface:
diagnose system modem com /dev/ttyusb2
- To unlock the custom modem AT commands:
#at!entercnd="A710"
- Check if the DHCPRELAYENABLE is enabled (in the output below, the DHCPRELAYENABLE is disabled):
#at!custom?
!CUSTOM:
GPSENABLE 0x01
GPSLPM 0x01
IPV6ENABLE 0x01
UIM2ENABLE 0x01
SIMLPM 0x01
USBSERIALENABLE 0x01
QXDMLOGENABLE 0x01
- Enable the DHCPRELAYENABLE with the AT command:
#at!custom="DHCPRELAYENABLE",1
- Check if DHCPRELAYENABLE is enabled:
at!custom?
!CUSTOM:
GPSENABLE 0x01
GPSLPM 0x01
IPV6ENABLE 0x01
UIM2ENABLE 0x01
SIMLPM 0x01
USBSERIALENABLE 0x01
DHCPRELAYENABLE 0x01 <----- Now enabled.
QXDMLOGENABLE 0x01
See the AT Command Reference.
To troubleshoot, collect the output of the following and upload it with a ticket:
diagnose system lte-modem traffic-status
fnsysctl ifconfig wwan
diagnose npu np6xlite dce 0
diagnose npu np6 dce 0
diagnose sniffer packet any "port 67 or port 68" 6 0 l
As of FortiOS 7.4.0, a new CLI setting was added to enable/disable DHCP relay packets flow through the modem interface (WWAN). Enable the dhcp-delay in the lte-modem config as shown below:
config system lte-modem
(lte-modem) # set dhcp-relay enable
(lte-modem) # end
The status can be verified via the following process:
diagnose sys lte-modem traffic-status
LTE Modem traffic status:
DHCP relay packets: blocked <-----
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