标签：war bre this options 定向 保护 _for 开机启动 version
***（virtual private network，虚拟专用网）就是在两个网络实体之间建立的一种受保护的连接，这两个实体可以通过点到点的链路直接相连，但通常情况下他们会相隔较远的距离。***方式有三种：
我们改动内核参数，允许IP转发、永久性禁止重定向。
sed -i ‘s#net.ipv4.ip_forward = 0#net.ipv4.ip_forward = 1#g‘ /etc/sysctl.conf
sed -i ‘s#net.ipv4.conf.default.rp_filter = 1#net.ipv4.conf.default.rp_filter = 0#g‘ /etc/sysctl.conf查看内核参数，确保禁止重定向sysctl -a | egrep "ipv4.*(accept|send)_redirects"
net.ipv4.conf.all.accept_redirects = 0
net.ipv4.conf.all.send_redirects = 0
net.ipv4.conf.default.accept_redirects = 0
net.ipv4.conf.default.send_redirects = 0
net.ipv4.conf.lo.accept_redirects = 0
net.ipv4.conf.lo.send_redirects = 0
net.ipv4.conf.eth0.accept_redirects = 0
net.ipv4.conf.eth0.send_redirects = 0重新装入/etc/sysctl.confsysctl -p
3、修改ipsec配置文件
vi /etc/ipsec.conf
config setup
plutodebug=all
plutostderrlog=/var/log/ipsec.log
# Debug-logging controls: "none" for (almost) none, "all" for lots.
# klipsdebug=none
# plutodebug="control parsing"
# For Red Hat Enterprise Linux and Fedora, leave protostack=netkey
protostack=netkey
nat_traversal=yes
#实现nat穿越
virtual_private=
oe=off
# Enable this if you see "failed to find any available worker"
# nhelpers=04、修改lan-to-lan的配置文件
[root@localhost ~]# cat /etc/ipsec.d/site1-tosite2.conf
conn site1-tosite2
type=tunnel
#隧道模式
authby=secret
#共享秘钥方式
auto=start
ike=3des-sha1;modp1024
keyexchange=ike
phase2=esp
phase2alg=3des-sha1
pfs=no
left=%defaultroute
leftid=alice
leftnexthop=%defaultroute
leftsubnet=192.168.1.0/24
right=172.17.0.1
rightsubnet=192.168.2.0/24 5、配置ipsec ***共享秘钥
vi /etc/ipsec.d/idcsubnet1-to-awsvpc1.secrets本端公网地址 对端公网地址: PSK "123456"
6、检查命令
设置开机启动 ，命令#chkconfig ipsec on
命令 #ipsec verify ,没有fail项即可
[root@localhost ~]# ipsec verify
Verifying installed system and configuration files
Version check and ipsec on-path [OK]
Libreswan 3.25 (netkey) on 3.10.0-1062.9.1.el7.x86_64
Checking for IPsec support in kernel [OK]
NETKEY: Testing XFRM related proc values
ICMP default/send_redirects [OK]
ICMP default/accept_redirects [OK]
XFRM larval drop [OK]
Pluto ipsec.conf syntax [OK]
Two or more interfaces found, checking IP forwarding [OK]
Checking rp_filter [ENABLED]
/proc/sys/net/ipv4/conf/all/rp_filter [ENABLED]
/proc/sys/net/ipv4/conf/ens33/rp_filter [ENABLED]
rp_filter is not fully aware of IPsec and should be disabled
Checking that pluto is running [OK]
Pluto listening for IKE on udp 500 [OK]
Pluto listening for IKE/NAT-T on udp 4500 [OK]
Pluto ipsec.secret syntax [OK]
Checking ‘ip‘ command [OK]
Checking ‘iptables‘ command [OK]
Checking ‘prelink‘ command does not interfere with FIPS [OK]
Checking for obsolete ipsec.conf options [OBSOLETE KEYWORD]
Warning: ignored obsolete keyword ‘nat_traversal‘
ipsec verify: encountered 5 errors - see ‘man ipsec_verify‘ for help命令 #service ipsec status ，检查进程状态，tunnel up数量
命令 #ip xfrm policy ，检查tunnel的详细信息，源/目的subnet、下一跳等
标签：war bre this options 定向 保护 _for 开机启动 version
原文地址：https://blog.51cto.com/1194325/2494099
