10.3. Configuring Preference for IPv6 or IPv4 (配置 IPv6 或 IPv4 偏好)

10.3. Configuring Preference for IPv6 or IPv4 (配置 IPv6 或 IPv4 偏好)

默认策略表给予 IPv6 地址比 IPv4 地址更高的优先级。这意味着当两者同样适用时, 应用程序将使用 IPv6 而不是 IPv4。管理员可以通过给 ::ffff:0.0.0.0/96 前缀更高的优先级来更改策略表以偏好 IPv4 地址:

   Prefix        Precedence Label
   ::1/128               50     0
   ::/0                  40     1
   ::ffff:0:0/96        100     4
   2002::/16             30     2
   2001::/32              5     5
   fc00::/7               3    13
   ::/96                  1     3
   fec0::/10              1    11
   3ffe::/16              1    12

对默认策略表的此更改产生以下行为:

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

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

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