本文介绍CentOS 7 安装 l2tp客户端具体方法
安装ipsec和l2tp协议工具
sudo yum install libreswan xl2tpd
配置文件
# /etc/ipsec.d/work.conf
config setup
keep-alive=300
conn Work
authby=secret
pfs=yes
auto=add
keyingtries=%forever
dpddelay=30
dpdtimeout=120
dpdaction=restart
rekey=yes
rekeymargin=1h
ikelifetime=8h
keylife=1h
type=transport
left=%defaultroute
leftprotoport=udp/l2tp
right=civnet.vicp.net
rightprotoport=udp/l2tp
ike=aes_ctr,aes_cbc,camellia_cbc,serpent_cbc,twofish_cbc,3des,3DES-SHA1;MODP1024
phase2alg=aes-HMAC_SHA1,3DES-HMAC_SHA1
sha2-truncbug=yes
# cat /etc/ipsec.d/Work.secrets
%any civnet.vicp.net : PSK "civvpn.vicp.net"
# cat /etc/xl2tpd/xl2tpd.conf
[lac Work]
lns = civnet.vicp.net
ppp debug = yes
pppoptfile=/etc/ppp/options.ppp
length bit = yes
redial = yes
autodial = yes
# cat /etc/ppp/options.ppp
ipcp-accept-local
ipcp-accept-remote
refuse-eap
require-mschap-v2
noccp
noauth
idle 86400
mtu 1400
mru 1400
nodefaultroute
debug
connect-delay 5000
name gitlabserver
password gitlabserver
查看日志
sudo tail -f /var/log/messages | grep -v "journal"
启动ipsec服务
sudo systemctl start ipsec
日志输出
Sep 7 20:05:55 gitlabserver systemd: Stopping Internet Key Exchange (IKE) Protocol Daemon for IPsec...
Sep 7 20:05:55 gitlabserver whack: 002 shutting down
Sep 7 20:05:55 gitlabserver systemd: Starting Internet Key Exchange (IKE) Protocol Daemon for IPsec...
Sep 7 20:05:55 gitlabserver ipsec: nflog ipsec capture disabled
Sep 7 20:05:55 gitlabserver systemd: Started Internet Key Exchange (IKE) Protocol Daemon for IPsec.
启动xl2tpd服务
sudo systemctl start xl2tpd
日志输出
Sep 7 20:08:38 gitlabserver pppd[8312]: Sent 714675 bytes, received 3429972 bytes.
Sep 7 20:08:38 gitlabserver pppd[8312]: Overriding mtu 1500 to 1400
Sep 7 20:08:38 gitlabserver pppd[8312]: Overriding mru 1500 to mtu value 1400
Sep 7 20:08:38 gitlabserver pppd[8312]: Terminating on signal 15
Sep 7 20:08:38 gitlabserver NetworkManager[898]: <info> [1536322118.7692] device (ppp0): state change: disconnected -> unmanaged (reason 'connection-assumed', sys-iface-state: 'external')
Sep 7 20:08:44 gitlabserver pppd[8312]: Connection terminated.
Sep 7 20:08:44 gitlabserver avahi-daemon[830]: Withdrawing workstation service for ppp0.
Sep 7 20:08:44 gitlabserver pppd[8312]: Modem hangup
Sep 7 20:08:44 gitlabserver pppd[8312]: Exit.
Sep 7 20:08:44 gitlabserver systemd: Unit xl2tpd.service entered failed state.
Sep 7 20:08:44 gitlabserver xl2tpd: xl2tpd[31374]: Not looking for kernel SAref support.
Sep 7 20:08:44 gitlabserver xl2tpd: xl2tpd[31374]: Using l2tp kernel support.
Sep 7 20:08:44 gitlabserver xl2tpd: xl2tpd[31374]: xl2tpd version xl2tpd-1.3.8 started on gitlabserver.localdomain PID:31374
Sep 7 20:08:44 gitlabserver xl2tpd: xl2tpd[31374]: Written by Mark Spencer, Copyright (C) 1998, Adtran, Inc.
Sep 7 20:08:44 gitlabserver xl2tpd: xl2tpd[31374]: Forked by Scott Balmos and David Stipp, (C) 2001
Sep 7 20:08:44 gitlabserver xl2tpd: xl2tpd[31374]: Inherited by Jeff McAdams, (C) 2002
Sep 7 20:08:44 gitlabserver xl2tpd: xl2tpd[31374]: Forked again by Xelerance (www.xelerance.com) (C) 2006-2016
Sep 7 20:08:44 gitlabserver xl2tpd: xl2tpd[31374]: Listening on IP address 0.0.0.0, port 1701
创建连接
sudo ipsec auto --up work
sudo xl2tpd-control connect work
日志输出
Sep 7 20:12:24 gitlabserver xl2tpd: xl2tpd[20538]: Connecting to host civnet.vicp.net, port 1701
Sep 7 20:12:24 gitlabserver xl2tpd: xl2tpd[20538]: Connection established to 171.113.154.63, 1701. Local: 45773, Remote: 36724 (ref=0/0).
Sep 7 20:12:24 gitlabserver xl2tpd: xl2tpd[20538]: Calling on tunnel 45773
Sep 7 20:12:24 gitlabserver xl2tpd: xl2tpd[20538]: Call established with 171.113.154.63, Local: 31692, Remote: 20120, Serial: 1 (ref=0/0)
Sep 7 20:12:24 gitlabserver pppd[31767]: Plugin pppol2tp.so loaded.
Sep 7 20:12:24 gitlabserver pppd[31767]: pppd 2.4.5 started by root, uid 0
Sep 7 20:12:24 gitlabserver NetworkManager[898]: <info> [1536322344.5696] manager: (ppp0): new Ppp device (/org/freedesktop/NetworkManager/Devices/470)
Sep 7 20:12:24 gitlabserver pppd[31767]: Using interface ppp0
Sep 7 20:12:24 gitlabserver pppd[31767]: Connect: ppp0 <-->
Sep 7 20:12:24 gitlabserver pppd[31767]: Overriding mtu 1500 to 1400
Sep 7 20:12:24 gitlabserver pppd[31767]: Overriding mru 1500 to mtu value 1400
Sep 7 20:12:27 gitlabserver pppd[31767]: CHAP authentication succeeded: Access granted
Sep 7 20:12:27 gitlabserver pppd[31767]: CHAP authentication succeeded
Sep 7 20:12:27 gitlabserver pppd[31767]: local IP address 10.1.0.2
Sep 7 20:12:27 gitlabserver pppd[31767]: remote IP address 10.1.0.1
Sep 7 20:12:27 gitlabserver NetworkManager[898]: <info> [1536322347.5741] device (ppp0): state change: unmanaged -> unavailable (reason 'connection-assumed', sys-iface-state: 'external')
Sep 7 20:12:27 gitlabserver NetworkManager[898]: <info> [1536322347.5746] device (ppp0): state change: unavailable -> disconnected (reason 'none', sys-iface-state: 'external')
检查路由，连接成功后会在系统路由中增加一个ppp0的网络接口
[gitlab@gitlabserver ~]$ route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 192.168.12.252 0.0.0.0 UG 100 0 0 enp2s0
10.1.0.1 0.0.0.0 255.255.255.255 UH 0 0 0 ppp0
172.17.0.0 0.0.0.0 255.255.0.0 U 0 0 0 docker0
192.168.12.0 0.0.0.0 255.255.255.0 U 100 0 0 enp2s0
192.168.122.0 0.0.0.0 255.255.255.0 U 0 0 0 virbr0
成功后允许进程自动启动
sudo systemctl enable xl2tpd