Protocol scan and Host Unreachable

[Rasmus Andersson <rasmus () pole-position org>]

Why is "host unreachable" interpreted the same as "protocol 
unreachable"? Is it a bug or do some hosts give that answer for unused 
protocols?

nmap-3.10ALPHA7/scan_engine.cc:
  ...
  switch(icmp->icmp_code) {

  case 1: /* Host unreachable */
  case 2: /* pr0t0c0l unreachable */
    if (scantype == IPPROT_SCAN) {
      newstate = PORT_CLOSED;
      ...


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