Issue with external NATing-LAN while using 3G-WAN

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  • #30194

    (NATing-LAN means by two Ethernet ports in same system with different sub-addresses routed to each other by SNAT an DNAT rules)
    Things go well when SIM card is missing but external NATing-LAN connected to Multitech MTCDT-LEU1 fails with SIM card inserted.
    Having a look under mLinux through SSH, there is always a single “default gateway”, either LAN or WAN, but never both.
    So messages (replies from Ping…) towards NATing-LAN might be lost in WAN when SIM card is present.
    Using multiple routing tables with different routing rules would be a walk-around but it suggests the presence of multiple default gateways in the first place.
    Since the network configuration is performed by application through “/var/config/db.json” instead of Linux-OS using “/etc/network/interfaces”, I am a bit lost ….
    So my question : Is there a simple way to walk-around this issue ?

    #30217

    Problem solved after NATing differently, avoiding Multitech the need of Default-gateway on LAN side …

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