###在亚马孙EC2上构建L2TP VPN （Setup L2TP over IPSec VPN on Ubuntu Linux with Amazon EC2）
由于各种原因本人还是喜欢用自己搭建的服务器上外国的网站。以前经常用PPTP上网，方便配置又简单。但无奈苹果MAC升级10.12 和 IOS 10.02 之后直接去掉PPTP的VPN链接方式，但我又喜欢用系统原生的VPN不想安装什么其它辅助软件，还是动手更新新的VPN方式吧。
废话少说看步骤。
$ sudo apt-get install openswan xl2tpd ppp
打开UDP上端口 500，1701，4500，
Open UDP ports 500, 1701, 4500 for public access.
$ sudo vi /etc/ipsec.conf
# /etc/ipsec.conf - Openswan IPsec configuration file
# This file: /usr/share/doc/openswan/ipsec.conf-sample
#
# Manual: ipsec.conf.5
version 2.0 # conforms to second version of ipsec.conf specification
# basic configuration
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 sample
# # Left security gateway, subnet behind it, nexthop toward right.
# left=10.0.0.1
# leftsubnet=172.16.0.0/24
# leftnexthop=10.22.33.44
# # Right security gateway, subnet behind it, nexthop toward left.
# right=10.12.12.1
# 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=add
#conn L2TP-PSK-NAT
# rightsubnet=vhost:%priv
# also=L2TP-PSK-noNAT
conn L2TP-PSK-noNAT
#
# Configuration for one user with any type of IPsec/L2TP client
# including the updated Windows 2000/XP (MS KB Q818043), but
# excluding the non-updated Windows 2000/XP.
#
#
# Use a Preshared Key. Disable Perfect Forward Secrecy.
#
# PreSharedSecret needs to be specified in /etc/ipsec.secrets as
# YourIPAddress %any: "sharedsecret"
authby=secret
pfs=no
auto=add
keyingtries=3
# we cannot rekey for %any, let client rekey
rekey=no
# Apple iOS doesn't send delete notify so we need dead peer detection
# to detect vanishing clients
dpddelay=10
dpdtimeout=90
dpdaction=clear
# Set ikelifetime and keylife to same defaults windows has
ikelifetime=8h
keylife=1h
# l2tp-over-ipsec is transport mode
type=transport
#
left=YOUR.SERVER.IP.ADDRESS #AWS EC2 Internal IP
#
# For updated Windows 2000/XP clients,
# to support old clients as well, use leftprotoport=17/%any
leftprotoport=17/1701
#
# The remote user.
#
right=%any
# Using the magic port of "%any" means "any one single port". This is
# a work around required for Apple OSX clients that use a randomly
# high port.
rightprotoport=17/%any
forceencaps=yes
$ vi /etc/ipsec.secrets
# This file holds shared secrets or RSA private keys for inter-Pluto
# authentication. See ipsec_pluto(8) manpage, and HTML documentation.
# RSA private key for this host, authenticating it to any other host
# which knows the public part. Suitable public keys, for ipsec.conf, DNS,
# or configuration of other implementations, can be extracted conveniently
# with "ipsec showhostkey".
# AWS EC2 Internal IP
YOUR.SERVER.IP.ADDRESS %any: PSK "YourSharedSecrets"
# this file is managed with debconf and will contain the automatically created RSA keys
#include /var/lib/openswan/ipsec.secrets.inc
$ service ipsec restart
$ vi /etc/xl2tpd/xl2tpd.conf
;
; Sample l2tpd configuration file
;
; This example file should give you some idea of how the options for l2tpd
; should work. The best place to look for a list of all options is in
; the source code itself, until I have the time to write better documetation :)
; Specifically, the file "file.c" contains a list of commands at the end.
;
; You most definitely don't have to spell out everything as it is done here
;
[global] ; Global parameters:
ipsec saref = yes
; port = 1701 ; * Bind to port 1701
; auth file = /etc/l2tpd/l2tp-secrets ; * Where our challenge secrets are
; access control = yes ; * Refuse connections without IP match
; rand source = dev ; Source for entropy for random
; ; numbers, options are:
; ; dev - reads of /dev/urandom
; ; sys - uses rand()
; ; egd - reads from egd socket
; ; egd is not yet implemented
;
[lns default] ; Our fallthrough LNS definition
; exclusive = no ; * Only permit one tunnel per host
; ip range = 192.168.0.1-192.168.0.20 ; * Allocate from this IP range
ip range = 10.1.2.2-10.1.2.255
local ip = 10.1.2.1
refuse chap = yes
refuse pap = yes
require authentication = yes
ppp debug = yes
pppoptfile = /etc/ppp/options.xl2tpd
length bit = yes
; no ip range = 192.168.0.3-192.168.0.9 ; * Except these hosts
; ip range = 192.168.0.5 ; * But this one is okay
; ip range = lac1-lac2 ; * And anything from lac1 to lac2's IP
; lac = 192.168.1.4 - 192.168.1.8 ; * These can connect as LAC's
; no lac = untrusted.marko.net ; * This guy can't connect
; hidden bit = no ; * Use hidden AVP's?
; local ip = 192.168.1.2 ; * Our local IP to use
; length bit = yes ; * Use length bit in payload?
; require chap = yes ; * Require CHAP auth. by peer
; refuse pap = yes ; * Refuse PAP authentication
; refuse chap = no ; * Refuse CHAP authentication
; refuse authentication = no ; * Refuse authentication altogether
; require authentication = yes ; * Require peer to authenticate
; unix authentication = no ; * Use /etc/passwd for auth.
; name = myhostname ; * Report this as our hostname
; ppp debug = no ; * Turn on PPP debugging
; pppoptfile = /etc/ppp/options.l2tpd.lns ; * ppp options file
; call rws = 10 ; * RWS for call (-1 is valid)
; tunnel rws = 4 ; * RWS for tunnel (must be > 0)
; flow bit = yes ; * Include sequence numbers
; challenge = yes ; * Challenge authenticate peer ;
; rx bps = 10000000 ; Receive tunnel speed
; tx bps = 10000000 ; Transmit tunnel speed
; bps = 100000 ; Define both receive and transmit speed in one option
; [lac marko] ; Example VPN LAC definition
; lns = lns.marko.net ; * Who is our LNS?
; lns = lns2.marko.net ; * A backup LNS (not yet used)
; redial = yes ; * Redial if disconnected?
; redial timeout = 15 ; * Wait n seconds between redials
; max redials = 5 ; * Give up after n consecutive failures
; hidden bit = yes ; * User hidden AVP's?
; local ip = 192.168.1.1 ; * Force peer to use this IP for us
; remote ip = 192.168.1.2 ; * Force peer to use this as their IP
; length bit = no ; * Use length bit in payload?
; require pap = no ; * Require PAP auth. by peer
; require chap = yes ; * Require CHAP auth. by peer
; refuse pap = yes ; * Refuse PAP authentication
; refuse chap = no ; * Refuse CHAP authentication
; refuse authentication = no ; * Refuse authentication altogether
; require authentication = yes ; * Require peer to authenticate
; name = marko ; * Report this as our hostname
; ppp debug = no ; * Turn on PPP debugging
; pppoptfile = /etc/ppp/options.l2tpd.marko ; * ppp options file for this lac
; call rws = 10 ; * RWS for call (-1 is valid)
; tunnel rws = 4 ; * RWS for tunnel (must be > 0)
; flow bit = yes ; * Include sequence numbers
; challenge = yes ; * Challenge authenticate peer
;
; [lac cisco] ; Another quick LAC
; lns = cisco.marko.net ; * Required, but can take from default
; require authentication = yes
$ service xl2tpd restart
$ sudo vi /etc/ppp/options.xl2tpd
require-mschap-v2
refuse-mschap
ms-dns 8.8.8.8
ms-dns 8.8.4.4
auth
mtu 1200
mru 1000
crtscts
hide-password
modem
name l2tpd
proxyarp
lcp-echo-interval 30
lcp-echo-failure 4
$ sudo vi /etc/ppp/pap-secrets
# Secrets for authentication using CHAP
# client server secret IP addresses
username l2tpd password *
$ sudo iptables --table nat --append POSTROUTING --jump MASQUERADE
保存iptable Save current iptables:
$ sudo apt-get install iptables-persistent
$ sudo vi /etc/sysctl.conf
增加下面的行到sysctl.conf: Add the following lines to sysctl.conf:
net.ipv4.ip_forward = 1
net.ipv4.conf.all.accept_redirects = 0
net.ipv4.conf.all.send_redirects = 0
应用改变， Apply changes:
$ sudo sysctl -p
$ tail -f /var/log/auth.log
#####⚠️注意要吧 YOUR.SERVER.IP.ADDRESS 改成EC2的内网IP
可以用ifconfig 查看eth0的地址
form： http://tanshuai.com/l2tp-over-ipsec-vpn-ubuntu-linux-aws-ec2/
deepxl 10月 20th, 2016
Posted In: computer knowledge(电脑知识)