Prefix        Precedence Label 
          ::1/128               50     0 
          ::/0                  40     1 
          2002::/16             30     2 
          ::/96                 20     3 
          ::ffff:0:0/96         10     4 

   Rule 1: Prefer same address. 
   If SA = D, then prefer SA. Similarly, if SB = D, then prefer SB. 

   Rule 2: Prefer appropriate scope. 
   If Scope(SA) < Scope(SB): If Scope(SA) < Scope(D), then prefer SB 
   and otherwise prefer SA. 
   Similarly, if Scope(SB) < Scope(SA): If Scope(SB) < Scope(D), then 
   prefer SA and otherwise prefer SB. 

   Rule 3: Avoid deprecated addresses. 
   The addresses SA and SB have the same scope. If one of the two 
   source addresses is "preferred" and one of them is "deprecated" (in 
   the RFC 2462 sense), then prefer the one that is "preferred." 

   Rule 4: Prefer home addresses. 
   If SA is simultaneously a home address and care-of address and SB is 
   not, then prefer SA. Similarly, if SB is simultaneously a home 
   address and care-of address and SA is not, then prefer SB. 
   If SA is just a home address and SB is just a care-of address, then 
   prefer SA. Similarly, if SB is just a home address and SA is just a 
   care-of address, then prefer SB. 

   Rule 5: Prefer outgoing interface. 
   If SA is assigned to the interface that will be used to send to D 
   and SB is assigned to a different interface, then prefer SA. 
   Similarly, if SB is assigned to the interface that will be used to 
   send to D and SA is assigned to a different interface, then prefer 
   SB. 

   Rule 6: Prefer matching label. 
   If Label(SA) = Label(D) and Label(SB) <> Label(D), then prefer SA. 
   Similarly, if Label(SB) = Label(D) and Label(SA) <> Label(D), then 
   prefer SB. 

   Rule 7: Prefer public addresses. 
   If SA is a public address and SB is a temporary address, then prefer 
   SA. Similarly, if SB is a public address and SA is a temporary 
   address, then prefer SB. 

   Rule 8: Use longest matching prefix. 
   If CommonPrefixLen(SA, D) > CommonPrefixLen(SB, D), then prefer SA. 
   Similarly, if CommonPrefixLen(SB, D) > CommonPrefixLen(SA, D), then 
   prefer SB. 

   Rule 1: Avoid unusable destinations. 
   If DB is known to be unreachable or if Source(DB) is undefined, then 
   prefer DA. Similarly, if DA is known to be unreachable or if 
   Source(DA) is undefined, then prefer DB. 

   Rule 2: Prefer matching scope. 
   If Scope(DA) = Scope(Source(DA)) and Scope(DB) <> Scope(Source(DB)), 
   then prefer DA. Similarly, if Scope(DA) <> Scope(Source(DA)) and 
   Scope(DB) = Scope(Source(DB)), then prefer DB. 

   Rule 3: Avoid deprecated addresses. 
   If Source(DA) is deprecated and Source(DB) is not, then prefer DB. 
   Similarly, if Source(DA) is not deprecated and Source(DB) is 
   deprecated, then prefer DA. 
  
   Rule 4: Prefer home addresses. 
   If Source(DA) is simultaneously a home address and care-of address 
   and Source(DB) is not, then prefer DA. Similarly, if Source(DB) is 
   simultaneously a home address and care-of address and Source(DA) is 
   not, then prefer DB. 
   If Source(DA) is just a home address and Source(DB) is just a care-
   of address, then prefer DA. Similarly, if Source(DA) is just a care-
   of address and Source(DB) is just a home address, then prefer DB. 

   Rule 5: Prefer matching label. 
   If Label(Source(DA)) = Label(DA) and Label(Source(DB)) <> Label(DB), 
   then prefer DA. Similarly, if Label(Source(DA)) <> Label(DA) and 
   Label(Source(DB)) = Label(DB), then prefer DB. 

   Rule 6: Prefer higher precedence. 
   If Precedence(DA) > Precedence(DB), then prefer DA. Similarly, if 
   Precedence(DA) < Precedence(DB), then prefer DB. 

   Rule 7: Prefer native transport. 
   If DA is reached via an encapsulating transition mechanism (eg, IPv6 
   in IPv4) and DB is not, then prefer DB. Similarly, if DB is reached 
   via encapsulation and DA is not, then prefer DA. 

   Rule 8: Prefer smaller scope. 
   If Scope(DA) < Scope(DB), then prefer DA. Similarly, if Scope(DA) > 
   Scope(DB), then prefer DB. 

   Rule 9: Use longest matching prefix. 
   When DA and DB belong to the same address family (both are IPv6 or 
   both are IPv4): If CommonPrefixLen(DA, Source(DA)) > 
   CommonPrefixLen(DB, Source(DB)), then prefer DA. Similarly, if 
   CommonPrefixLen(DA, Source(DA)) < CommonPrefixLen(DB, Source(DB)), 
   then prefer DB. 

   Rule 10: Otherwise, leave the order unchanged. 
   If DA preceded DB in the original list, prefer DA. Otherwise prefer 
   DB.