Azure Internal Load Balancer support for SCTP

Sundar Vadivelu 20 Reputation points Microsoft Employee
2023-05-11T00:42:41.3266667+00:00

Hi,

How does Azure ILB with HA ports treat sctp traffic? I see that ILB supports TCP and UDP based traffic. But what does it do when there is SCTP traffic (which is neither UDP nor TCP)? Does it drop it? Or does it blindly distribute the traffic agnostic of the protocol?

Thanks

Azure Load Balancer
Azure Load Balancer
An Azure service that delivers high availability and network performance to applications.
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  1. Priya Kumar 1,096 Reputation points Microsoft Employee
    2023-05-11T03:08:06.63+00:00

    Hello @Sundar Vadivelu

     

    Thanks for reaching out to Microsoft Q and A platform.

     

    As far of research, SCTP is not supported in Azure Platform.

     

    ·       Meaning, within the Vnets or across the Vnets SCTP is currently not supported. In some scenario it may work but Not Supported.

    ·       What protocols can I use within VNets? - You can use TCP, UDP, and ICMP TCP/IP protocols within VNets. 

    Documents: https://learn.microsoft.com/en-us/azure/virtual-network/virtual-networks-faq#what-protocols-can-i-use-within-vnets

    ·       There is UDP encapsulation of SCTP, which could be used as workaround if you could enable it.

    RFC 6951 - UDP Encapsulation of Stream Control Transmission Protocol (SCTP) Packets for End-Host to End-Host Communication (ietf.org)

     

    Regards,

    Priya Kumar

     


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