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从 IPv6 子网 (/64) 绑定到随机 IP 不起作用

tag-icon • tag-icon ipv6 subnet scaleway
从 IPv6 子网 (/64) 绑定到随机 IP 不起作用

我有一个 scaleway.com 服务器 (DEV1-S)，它为我提供了一个 /64 IPv6 子网。我想使用此子网中的 IP 发出 HTTP 请求（将在示例中使用 wget），但我无法让它工作。请求（使用 wget 以及其他程序和编程语言）将挂起。

IPv6 地址为 2001:bc8:1830:1b18::1，网关为 2001:bc8:1830:1b18::，网络掩码为 64。

ip -6 addr在干净的/刚创建的服务器上运行，将输出以下内容：

root@test:~# ip -6 addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 state UNKNOWN qlen 1000
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: ens2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 state UP qlen 1000
    inet6 2001:bc8:1830:1b18::1/64 scope global 
       valid_lft forever preferred_lft forever
    inet6 fe80::dc2e:4cff:fe57:a019/64 scope link 
       valid_lft forever preferred_lft forever

我在论坛和其他问题/答案中看到，为了能够绑定到子网中的地址，您需要运行以下命令：

ip add add local 2001:bc8:1830:1b18::/64 dev lo
ip route add local 2001:bc8:1830:1b18::/64 dev ens2
sysctl -w net.ipv6.ip_nonlocal_bind=1

执行这些命令后，输出ip -6 addr如下：

root@test:~# ip -6 addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 state UNKNOWN qlen 1000
    inet6 2001:bc8:1830:1b18::/64 scope global 
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: ens2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 state UP qlen 1000
    inet6 2001:bc8:1830:1b18::1/64 scope global 
       valid_lft forever preferred_lft forever
    inet6 fe80::dc2e:4cff:fe57:a019/64 scope link 
       valid_lft forever preferred_lft forever

例如，现在我可以 ping6，而2001:bc8:1830:1b18::9不仅仅是2001:bc8:1830:1b18::1，但只能从我自己的服务器。 而不是从其他服务器/网络。

如果没有sysctl -w net.ipv6.ip_nonlocal_bind=1，wget 将返回以下内容：

root@test:~# wget --bind-address=2001:bc8:1830:1b18::2 -v google.com
--2021-08-13 00:29:45--  http://google.com/
Resolving google.com (google.com)... 2a00:1450:400e:802::200e, 142.250.179.174
Connecting to google.com (google.com)|2a00:1450:400e:802::200e|:80... failed: Cannot assign requested address.
Connecting to google.com (google.com)|142.250.179.174|:80... failed: Address family not supported by protocol.

现在，执行完这 3 条命令后，当我运行 wget 并将 --bind-address 标志设置为除 之外的子网中的地址时2001:bc8:1830:1b18::1，请求将永远挂起：

root@test:~# wget --bind-address=2001:bc8:1830:1b18::1 google.com
--2021-08-12 23:55:48--  http://google.com/
Resolving google.com (google.com)... 2a00:1450:400e:802::200e, 142.250.179.174
Connecting to google.com (google.com)|2a00:1450:400e:802::200e|:80... connected.
HTTP request sent, awaiting response... 301 Moved Permanently
Location: http://www.google.com/ [following]
--2021-08-12 23:55:48--  http://www.google.com/
Resolving www.google.com (www.google.com)... 2a00:1450:400e:80f::2004, 142.251.36.4
Connecting to www.google.com (www.google.com)|2a00:1450:400e:80f::2004|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: unspecified [text/html]
Saving to: ‘index.html’

index.html                                                                       [ <=>                                                                                                                                                                                         ]  13.03K  --.-KB/s    in 0.009s  

2021-08-12 23:55:48 (1.44 MB/s) - ‘index.html’ saved [13342]

root@test:~# wget --bind-address=2001:bc8:1830:1b18::2 google.com
--2021-08-12 23:55:52--  http://google.com/
Resolving google.com (google.com)... 2a00:1450:400e:802::200e, 142.250.179.174
Connecting to google.com (google.com)|2a00:1450:400e:802::200e|:80...

lsof对于 wget 进程，内容如下：wget 3413 root 3u IPv6 58660 0t0 TCP[2001:bc8:1830:1b18::2]:56623->ams15s41-in-x0e.1e100.net:http (SYN_SENT)

我做错了什么？提前谢谢您！

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