There is no single TCP monoculture codebase -- even among Unix-alikes, the Linux networking stack is a reimplementation, with no common ancestry with the BSD st

There is no single TCP monoculture codebase -- even among Unix-alikes, the Linux networking stack is a reimplementation, with no common ancestry with the BSD stack. (To say nothing of routers with their own implementations, often including hardware assist at the high end.)