[e2e] ICMP & TCP segments with IP ID = 0?

[Rick Jones]

> In addition the classic global ipid counter is a contended global
> resource on a multiprocessor stack, and maintaining it per
> destination also has its problems.

It (generating IP IDs) didn't seem to be that big a deal for up to
16-CPU systems running SPECweb96 benchmarks, and there are up to 12-CPU
systems today doing SPECweb99 bencharks.

rick jones
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