OpenVPN Security Advisory: Dec 14, 2018
Action needed: Important update for OpenVPN Access Server

“MULTI: bad source address from client , packet dropped” or “GET INST BY VIRT: [failed]”?

FAQ

These errors occur because OpenVPN doesn't have an internal route for 192.168.100.249. Consequently, it doesn't know how to route the packet to this machine, so it drops the packet.
Use client-config-dir and create a ccd file for your client containing the iroute option to tell OpenVPN that the 192.168.100.0/24 network is available behind this client.
"MULTI: bad source address from client [192.168.100.249], packet dropped" or "GET INST BY VIRT: 192.168.100.249 [failed]"?

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