@GraphiteJess wrote: When the PLC ARPs for my computer's IP on the VPN, it does NOT get a response from the MX. Nor should it, unless Proxy ARP is enabled, which I'm not sure the MX supports. So what this sounds like to me is that the PLC either doesn't respect the default gateway setting or the subnet mask is configured incorrectly. The only way the PLC _should_ ARP for a device not on the subnet is if it doesn't have a default gateway (solved by Proxy ARP) or if it thinks the IP is on its local subnet when it's really not (incorrect mask). If the mask is correct and the PLC refuses to use its gateway to get to another subnet then it could be worth a try calling support to see if they can enable proxy ARP.
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