I'm not finding ways to to use MD5. TCP MD5 is supported on Linux and BSDs, and TCP-AO isn't. TCP MD5 has been used for decades to protect BGP, and exactly bec

I'm not finding ways to to use MD5. TCP MD5 is supported on Linux and BSDs, and TCP-AO isn't. TCP MD5 has been used for decades to protect BGP, and exactly because it's still safe there's been no push to add TCP-AO. And it inherently requires kernel support, because it's part of TCP, not the application. I would have preferred TCP-AO (RFC5925), not TCP MD5 (RFC2385), but the former is not supported anywhere. See more at https://blog.habets.se/2019/11/TCP-MD5.html https://blog.habets.se/2019/11/TCP-MD5.html (I should have added this link in my comment, but I forgot I wrote a blog post on the topic)