Hello,
I think what you're looking for is a way to specify which IP address should be used as a source IP address when ICMP (ping) packet is being generated by the system. To accomplish this, the following command may be used using Teltonika's CLI (SSH):
ping -I <SOURCE_INTERFACE_IP_ADDRESS> <DESTINATION_IP_ADDRESS>
For example, you may use the following command, assuming your VLAN interface IP address on the router is 192.168.100.1:
ping -I 192.168.100.1 8.8.8.8
To figure out what IP address you'd like to use as source IP address, you may issue the following command in the CLI of the router/gateway:
ip -4 -br address
Additional available flags for ping program can be checked with the help flag:
ping -h