“Because it may be desirable to reserve one or more link numbers for instrumentation purposes, and because 256 link numbers are many more than are needed, we suggest that no link number over 63 be used.”

Apr 16, 2021 · 9:10 PM UTC

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“At UCLA, we will implement our tables to take advantage of this limitation. We also note that 32 may be even more realistic, but 64 is certainly sufficient.” tools.ietf.org/html/rfc25, 30 October 1969
Replying to @stilkov
What's being referred to here? "Link numbers"? I have a firm understanding of TCP/IP but can you help me out?
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This predates TCP/IP by about 650 RFCs and half a decade, so I’m not 100% sure :) My understanding is it’s the physical endpoints, so probably analogous to network interfaces of today
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