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10.2. Default Destination Address Selection

The destination address selection rules, in conjunction with the default policy table and the source address selection rules, produce the following behavior:

Example 1:

  • Candidate Source Addresses: 2001:db8:1::2 or fe80::1 or 169.254.13.78
  • Destination Address List: 2001:db8:1::1 or 198.51.100.121
  • Result: 2001:db8:1::1 (src 2001:db8:1::2) then 198.51.100.121 (src 169.254.13.78) (prefer matching scope)

Example 2:

  • Candidate Source Addresses: fe80::1 or 198.51.100.117
  • Destination Address List: 2001:db8:1::1 or 198.51.100.121
  • Result: 198.51.100.121 (src 198.51.100.117) then 2001:db8:1::1 (src fe80::1) (prefer matching scope)

Example 3:

  • Candidate Source Addresses: 2001:db8:1::2 or fe80::1 or 10.1.2.4
  • Destination Address List: 2001:db8:1::1 or 10.1.2.3
  • Result: 2001:db8:1::1 (src 2001:db8:1::2) then 10.1.2.3 (src 10.1.2.4) (prefer higher precedence)

Example 4:

  • Candidate Source Addresses: 2001:db8:1::2 or fe80::2
  • Destination Address List: 2001:db8:1::1 or fe80::1
  • Result: fe80::1 (src fe80::2) then 2001:db8:1::1 (src 2001:db8:1::2) (prefer smaller scope)

Example 5:

  • Candidate Source Addresses: 2001:db8:1::2 (care-of address) or 2001:db8:3::1 (home address) or fe80::2 (care-of address)
  • Destination Address List: 2001:db8:1::1 or fe80::1
  • Result: 2001:db8:1::1 (src 2001:db8:3::1) then fe80::1 (src fe80::2) (prefer home address)

Example 6:

  • Candidate Source Addresses: 2001:db8:1::2 or fe80::2 (deprecated)
  • Destination Address List: 2001:db8:1::1 or fe80::1
  • Result: 2001:db8:1::1 (src 2001:db8:1::2) then fe80::1 (src fe80::2) (avoid deprecated addresses)

Example 7:

  • Candidate Source Addresses: 2001:db8:1::2 or 2001:db8:3f44::2 or fe80::2
  • Destination Address List: 2001:db8:1::1 or 2001:db8:3ffe::1
  • Result: 2001:db8:1::1 (src 2001:db8:1::2) then 2001:db8:3ffe::1 (src 2001:db8:3f44::2) (longest matching prefix)

Example 8:

  • Candidate Source Addresses: 2002:c633:6401::2 or fe80::2
  • Destination Address List: 2002:c633:6401::1 or 2001:db8:1::1
  • Result: 2002:c633:6401::1 (src 2002:c633:6401::2) then 2001:db8:1::1 (src 2002:c633:6401::2) (prefer matching label)

Example 9:

  • Candidate Source Addresses: 2002:c633:6401::2 or 2001:db8:1::2 or fe80::2
  • Destination Address List: 2002:c633:6401::1 or 2001:db8:1::1
  • Result: 2001:db8:1::1 (src 2001:db8:1::2) then 2002:c633:6401::1 (src 2002:c633:6401::2) (prefer higher precedence)
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