Amazon VPC 与 Linux 服务器之间的 IPSec VPN

Amazon VPC 与 Linux 服务器之间的 IPSec VPN

我正在尝试使用他们的 VPN 系统和 Linux 服务器在我们的公司网络和 Amazon 的虚拟私有云之间建立 IPSec VPN 连接。不幸的是,我找到的唯一指南讨论了如何使用主机 Linux 机器设置隧道并让该 Linux 机器访问 VPC 实例,但我在网上找不到关于如何让实例访问公司网络(或通过该网络访问互联网的其余部分)的讨论。

网络信息

Local subnet: 10.3.0.0/25
Remote subnet: 10.4.0.0/16

Tunnel 1:
  Outside IP Addresses:
    - Customer Gateway:        : 199.167.xxx.xxx
    - VPN Gateway              : 205.251.233.121

  Inside IP Addresses
    - Customer Gateway         : 169.254.249.2/30
    - VPN Gateway              : 169.254.249.1/30

Tunnel 2:
  Outside IP Addresses:
    - Customer Gateway:        : 199.167.xxx.xxx
    - VPN Gateway              : 205.251.233.122

  Inside IP Addresses
    - Customer Gateway         : 169.254.249.6/30
    - VPN Gateway              : 169.254.249.5/30

这是我的 /etc/ipsec-tools.conf:

flush;
spdflush;

spdadd 169.254.249.2/30 169.254.249.1/30 any -P out ipsec
   esp/tunnel/199.167.xxx.xxx-205.251.233.121/require;

spdadd 169.254.249.1/30 169.254.249.2/30 any -P in ipsec
   esp/tunnel/205.251.233.121-199.167.xxx.xxx/require;

spdadd 169.254.249.6/30 169.254.249.5/30 any -P out ipsec
   esp/tunnel/199.167.xxx.xxx-205.251.233.122/require;

spdadd 169.254.249.5/30 169.254.249.6/30 any -P in ipsec
   esp/tunnel/205.251.233.122-199.167.xxx.xxx/require;



spdadd 169.254.249.2/30 10.4.0.0/16 any -P out ipsec
   esp/tunnel/199.167.xxx.xxx-205.251.233.121/require;

spdadd 10.4.0.0/16 169.254.249.2/30 any -P in ipsec
   esp/tunnel/205.251.233.121-199.167.xxx.xxx/require;

spdadd 169.254.249.6/30 10.4.0.0/16 any -P out ipsec
   esp/tunnel/199.167.xxx.xxx-205.251.233.122/require;

spdadd 10.4.0.0/16 169.254.249.6/30 any -P in ipsec
   esp/tunnel/205.251.233.122-199.167.xxx.xxx/require;

这是我的 /etc/racoon/racoon.conf:

remote 205.251.233.122 {
        exchange_mode main;
        lifetime time 28800 seconds;
        proposal {
                encryption_algorithm aes128;
                hash_algorithm sha1;
                authentication_method pre_shared_key;
                dh_group 2;
        }
        generate_policy off;
}

remote 205.251.233.121 {
        exchange_mode main;
        lifetime time 28800 seconds;
        proposal {
                encryption_algorithm aes128;
                hash_algorithm sha1;
                authentication_method pre_shared_key;
                dh_group 2;
        }
        generate_policy off;
}

sainfo address 169.254.249.2/30 any address 169.254.249.1/30 any {
    pfs_group 2;
    lifetime time 3600 seconds;
    encryption_algorithm aes128;
    authentication_algorithm hmac_sha1;
    compression_algorithm deflate;
}

sainfo address 169.254.249.6/30 any address 169.254.249.5/30 any {
    pfs_group 2;
    lifetime time 3600 seconds;
    encryption_algorithm aes128;
    authentication_algorithm hmac_sha1;
    compression_algorithm deflate;
}

BGP 运行良好,所以我不会发布这些配置。

以下是有效的方法

  • 从 Linux 机器中,我可以 ping 本地端点 (169.254.249.2/169.254.249.6) 及其远程等效端点 (169.254.249.1/169.254.249.5)。
  • 我还可以 ping VPC 中的实例、通过 SSH 连接它们等等。
  • 从 VPC 中的远程实例,我也可以 ping 本地和远程端点
  • 我无法 ping 10.3.0.0/25 子网上的本地服务器

我认为我遗漏了一些简单的东西,但我已尝试向 ipsec-tools.conf 添加条目来镜像 {local endpoint} <-> {remote subnet},使用 {local subnet} <-> {remote endpoint},但似乎没有起作用。

当我从 {远程实例} ping 到 {本地服务器} 时,ping 超时。数据包在 eth0 接口上可见(即使本地网络在 eth1 上)。

谷歌帮不上什么忙;它只显示人们尝试使用 OpenSwan,或者遇到类似的问题但使用硬件路由器,或者使用较旧的工具。

答案1

好吧,我作弊了 :) 我安装了亚马逊官方支持的 Astaro 网关,然后用它来建模我自己的网关。您只需通过 SSH 进入 Astaro 设备,看看他们是如何设置一切的。当然,如果您愿意付费,您可以继续使用 Astaro 设备。

答案2

搞清楚了。必须将我的 ipsec-tools.conf 更改为:

flush;
spdflush;

# Generic routing
spdadd 10.4.0.0/16 10.3.0.0/25 any -P in  ipsec esp/tunnel/205.251.233.121-199.167.xxx.xxx/require;
spdadd 10.3.0.0/25 10.4.0.0/16 any -P out ipsec esp/tunnel/199.167.xxx.xxx-205.251.233.121/require;

# Tunnel 1
spdadd 169.254.249.1/30 169.254.249.2/30 any -P in  ipsec esp/tunnel/205.251.233.121-199.167.xxx.xxx/require;
spdadd 169.254.249.2/30 169.254.249.1/30 any -P out ipsec esp/tunnel/199.167.xxx.xxx-205.251.233.121/require;

spdadd 10.4.0.0/16 169.254.249.2/30 any -P in  ipsec esp/tunnel/205.251.233.121-199.167.xxx.xxx/require;
spdadd 169.254.249.2/30 10.4.0.0/16 any -P out ipsec esp/tunnel/199.167.xxx.xxx-205.251.233.121/require;

# Tunnel 2
spdadd 169.254.249.5/30 169.254.249.6/30 any -P in  ipsec esp/tunnel/205.251.233.122-199.167.xxx.xxx/require;
spdadd 169.254.249.6/30 169.254.249.5/30 any -P out ipsec esp/tunnel/199.167.xxx.xxx-205.251.233.122/require;

spdadd 10.4.0.0/16 169.254.249.6/30 any -P in  ipsec esp/tunnel/205.251.233.122-199.167.xxx.xxx/require;
spdadd 169.254.249.6/30 10.4.0.0/16 any -P out ipsec esp/tunnel/199.167.xxx.xxx-205.251.233.122/require;

并将我的 racoon.conf 更改为如下内容:

path pre_shared_key "/etc/racoon/psk.txt";

remote 205.251.233.122 {
        exchange_mode main;
        lifetime time 28800 seconds;
        proposal {
                encryption_algorithm aes128;
                hash_algorithm sha1;
                authentication_method pre_shared_key;
                dh_group 2;
        }
        generate_policy off;
}

remote 205.251.233.121 {
        exchange_mode main;
        lifetime time 28800 seconds;
        proposal {
                encryption_algorithm aes128;
                hash_algorithm sha1;
                authentication_method pre_shared_key;
                dh_group 2;
        }
        generate_policy off;
}

sainfo address 169.254.249.2/30 any address 169.254.249.1/30 any {
    pfs_group 2;
    lifetime time 3600 seconds;
    encryption_algorithm aes128;
    authentication_algorithm hmac_sha1;
    compression_algorithm deflate;
}

sainfo address 169.254.249.6/30 any address 169.254.249.5/30 any {
    pfs_group 2;
    lifetime time 3600 seconds;
    encryption_algorithm aes128;
    authentication_algorithm hmac_sha1;
    compression_algorithm deflate;
}

sainfo address 10.3.0.0/25 any address 10.4.0.0/16 any {
    pfs_group 2;
    lifetime time 3600 seconds;
    encryption_algorithm aes128;
    authentication_algorithm hmac_sha1;
    compression_algorithm deflate;
}

但是,据我所知,此配置只会通过第一个隧道(通过 xxx121)路由 10.3.0.0/25 和 10.4.0.0/16 之间的流量。当我弄清楚后,我会更新答案。

答案3

您知道在 setkey 配置中使用“require”而不是“use”的原因吗?您是否还知道我在 remote 和 sainfo 部分中放置语句的顺序以及错误地重复某些语句是否重要?例如:

#original
remote 205.251.233.121 {
        exchange_mode main;
        lifetime time 28800 seconds;
        proposal {
                encryption_algorithm aes128;
                hash_algorithm sha1;
                authentication_method pre_shared_key;
                dh_group 2;
        }
        generate_policy off;
}

对比

#edited
remote 205.251.233.121 {
        generate_policy off;                           #moved/duplicated
        lifetime time 28800 seconds;
        proposal {
                dh_group 2;                           #moved
                encryption_algorithm aes128;
                hash_algorithm sha1;
                authentication_method pre_shared_key;
        }
         exchange_mode main;                      #moved
        generate_policy off;                   #duplicated/moved
}

您是否还想出了如何让交通在两个隧道上畅通?

谢谢您的指导。

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