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I was extensively researching this option and came to a conclusion that OpenStack doesn't natively support routing of SCTP headers. You will need to use third party solutions such as GRE tunneling or L2TP, likely with OvS. Overlay is the only option unfortunately. You can establish a master GRE node and from there relay other tunnels towards machines that you need. Also you can do it with VPN as well, that if you need some sort of encryption (or IPsec).