通过LAN在两台Ubuntu 12.04 PC之间建立IPSEC隧道

Question

我有两个ubuntu 12.04 32位PC，我希望在其中设置IPSec隧道。我在两个系统中都设置了ipsec，ipsec verify在两个系统上都运行良好。由于我之前没有使用openswan，我发现很难设置配置文件。

以下是ipsec.config

的摘要

config setup
# Do not set debug options to debug configuration issues!
# plutodebug / klipsdebug = "all", "none" or a combation from below:
# "raw crypt parsing emitting control klips pfkey natt x509 dpd private"
# eg:
# plutodebug="control parsing"
# Again: only enable plutodebug or klipsdebug when asked by a developer
#
# enable to get logs per-peer
# plutoopts="--perpeerlog"
#
# Enable core dumps (might require system changes, like ulimit -C)
# This is required for abrtd to work properly
# Note: incorrect SElinux policies might prevent pluto writing the core
dumpdir=/var/run/pluto/
#
# NAT-TRAVERSAL support, see README.NAT-Traversal
nat_traversal=yes
# exclude networks used on server side by adding %v4:!a.b.c.0/24
# It seems that T-Mobile in the US and Rogers/Fido in Canada are
# using 25/8 as "private" address space on their 3G network.
# This range has not been announced via BGP (at least upto 2010-12-21)
virtual_private=%v4:10.0.0.0/8,%v4:192.168.0.0/16,%v4:172.16.0.0/12,%v4:25.0.0.0/8,%v6:fd00::/8,%v6:fe80::/10
# OE is now off by default. Uncomment and change to on, to enable.
oe=off
# which IPsec stack to use. auto will try netkey, then klips then mast
protostack=netkey
# Use this to log to a file, or disable logging on embedded systems (like openwrt)
#plutostderrlog=/dev/null

# Add connections here

# sample VPN connection
# for more examples, see /etc/ipsec.d/examples/
conn linux-to-linux
#       # Left security gateway, subnet behind it, nexthop toward right.
        left=192.168.58.17
#       leftsubnet=172.16.0.0/24
#       leftnexthop=10.22.33.44
#       # Right security gateway, subnet behind it, nexthop toward left.
        right=192.168.58.32
#       rightsubnet=192.168.0.0/24
#       rightnexthop=10.101.102.103
#       # To authorize this connection, but not actually start it, 
#       # at startup, uncomment this.
        auto=start

查询：

1. 现在基于我网络的给定拓扑（见图），以上配置对两台PC都是正确的。
2. 左右两台PC都必须相同。
3. 设置完成后如何确认安全隧道是否正常工作，检查正在使用的算法和数据包内容的最佳工具是什么。
4. 在局域网内部，安全的ipsec隧道称为主机到主机隧道，站点到站点的连接是指VPN何时启动，对吧？

Answer 1

Quse 1）现在基于我网络的给定拓扑（见图），以上配置对两台PC都是正确的。 Ans）您必须提供ipsec.secrets文件和身份验证方法，如PSK / RSA

问题2）左右PC是否必须相同。 Ans）左右互换。

Quse 3）设置完成后如何确认安全隧道是否正常工作，检查正在使用的算法和数据包内容的最佳工具是什么。 Ans）尝试ping中心站点上的任何系统。

问题4）在LAN内部，安全的ipsec隧道称为主机到主机隧道，站点到站点连接是指VPN启动时，对吗？ Ans）不，主机到主机和站点到站点是两种不同的VPN配置，具体取决于网络拓扑