in Golang it's easy to use SetDSCP sets the 6bit DSCP field in IPv4 header, or 8bit Traffic Class in IPv6 header.
How do I achieve it in Rust UDP Socket?
Thanks
Yeah it doesn't seems there's an easy way for it. Here's a PR on the socket2 crate to add this feature.
https://github.com/rust-lang/socket2/pull/224
Note that setting those flags on application is discouraged as ISPs tends to overwrite them on the network edge. The PR conversation contains a link to the windows document mentioning "DO NOT USE".
They're usable and useful when the connection is exclusively transiting private networks. If such a private network isn't stripping DSCP on ingress & egress, they have a bug that will turn into a deliverability problem 
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