connect to meraki client vpn from strongswan (ubuntu 16.04 edition)

meraki_strongswan_notes.md

These are my notes for connecting to a meraki client vpn from ubuntu 16.04. This configuration assumes you are using a psk for the ipsec auth.

Install the following packages:

apt-get install -y strongswan xl2tpd

Configure strong swan

cat > /etc/ipsec.conf <<EOF
# ipsec.conf - strongSwan IPsec configuration file

# basic configuration

config setup
        # strictcrlpolicy=yes
        # uniqueids = no

# Add connections here.

# Sample VPN connections

conn %default
        ikelifetime=60m
        keylife=20m
        rekeymargin=3m
        keyingtries=1
        keyexchange=ikev1
        authby=secret
        ike=aes128-sha1-modp1024,3des-sha1-modp1024!
        esp=aes128-sha1-modp1024,3des-sha1-modp1024!

conn meraki-vpn
     keyexchange=ikev1
     left=%defaultroute
     auto=add
     authby=secret
     type=transport
     leftprotoport=17/1701
     rightprotoport=17/1701
     # set this to the ip address of your meraki vpn  
     right=XXX.XXX.XXX.XXX
EOF

cat > /etc/ipsec.secrets <<EOF
: PSK "YOUR_PSK_GOES_HERE"
EOF

Configure xl2tp:

cat > /etc/xl2tpd/xl2tpd.conf <<EOF
[lac meraki]
# your meraki vpn ip goes here
lns = XXX.XXX.XXX.XXX
ppp debug = yes
pppoptfile = /etc/ppp/options.l2tpd.client
length bit = yes
EOF

cat > /etc/ppp/options.l2tpd.client <<EOF
ipcp-accept-local
ipcp-accept-remote
refuse-eap
require-mschap-v2
noccp
noauth
idle 1800
mtu 1410
mru 1410
defaultroute
usepeerdns
debug
lock
connect-delay 5000
EOF

mkdir -p /var/run/xl2tpd
touch /var/run/xl2tpd/l2tp-control

Restart your services:

service strongswan restart
service xl2tpd restart

Start the ipsec connection:

ipsec auto --up meraki

Start the l2tp connection (with your username and password)

echo "c meraki <user> <pass>" > /var/run/xl2tpd/l2tp-control

Add a route for your internal network:

ip route add 10.0.0.1/24 dev ppp0

To disconnect:

echo "d meraki" > /var/run/xl2tpd/l2tp-control
ipsec down meraki

conn %default
ikelifetime=1440m
keylife=20m
rekeymargin=3m
keyingtries=1
keyexchange=ikev1
authby=secret
ike=aes128-sha1-modp1024,3des-sha1-modp1024!
esp=aes128-sha1-modp1024,3des-sha1-modp1024!

conn usa
left=xxx.xxx.xxx.xxx
leftsubnet=0.0.0.0/0
right=xxx.xxx.xxx.xxx
rightsubnet=10.201.21.0/20
keyexchange=ikev1
auto=route
authby=secret

here is my setting.but I can't connect successfully.It show me this message :

initiating Main Mode IKE_SA usa[1] to B
generating ID_PROT request 0 [ SA V V V V V ]
sending packet: from A[500] to B[500] (220 bytes)
received packet: from B[500] to A[500] (160 bytes)
parsed ID_PROT response 0 [ SA V V V V ]
received XAuth vendor ID
received NAT-T (RFC 3947) vendor ID
received DPD vendor ID
received FRAGMENTATION vendor ID
selected proposal: IKE:3DES_CBC/HMAC_SHA1_96/PRF_HMAC_SHA1/MODP_1024
generating ID_PROT request 0 [ KE No NAT-D NAT-D ]
sending packet: from A[500] to B[500] (244 bytes)
received packet: from B[500] to A[500] (228 bytes)
parsed ID_PROT response 0 [ KE No NAT-D NAT-D ]
generating ID_PROT request 0 [ ID HASH N(INITIAL_CONTACT) ]
sending packet: from A[500] to B[500] (100 bytes)
received packet: from B[500] to A[500] (92 bytes)
parsed ID_PROT response 0 [ ID HASH V ]
received DPD vendor ID
IKE_SA usa[1] established between A[A]...B[B]
scheduling reauthentication in 86173s
maximum IKE_SA lifetime 86353s
generating QUICK_MODE request 2161754081 [ HASH SA No KE ID ID ]
sending packet: from A[500] to B[500] (340 bytes)
sending retransmit 1 of request message ID 2161754081, seq 4
sending packet: from A[500] to B[500] (340 bytes)
received packet: from B[500] to A[500] (92 bytes)
parsed INFORMATIONAL_V1 request 2262587242 [ HASH N(DPD) ]
sending retransmit 2 of request message ID 2161754081, seq 4
sending packet: from A[500] to B[500] (340 bytes)
received packet: from B[500] to A[500] (92 bytes)
parsed INFORMATIONAL_V1 request 2583933086 [ HASH N(DPD) ]
received packet: from B[500] to A[500] (92 bytes)
parsed INFORMATIONAL_V1 request 3182138456 [ HASH N(DPD) ]
sending retransmit 3 of request message ID 2161754081, seq 4
sending packet: from A[500] to B[500] (340 bytes)
received packet: from B[500] to A[500] (92 bytes)
parsed INFORMATIONAL_V1 request 2987448349 [ HASH N(DPD) ]
received packet: from B[500] to A[500] (92 bytes)
parsed INFORMATIONAL_V1 request 2818422143 [ HASH N(DPD) ]
sending retransmit 4 of request message ID 2161754081, seq 4
sending packet: from A[500] to B[500] (340 bytes)
sending retransmit 5 of request message ID 2161754081, seq 4
sending packet: from A[500] to B[500] (340 bytes)
giving up after 5 retransmits
initiating Main Mode IKE_SA usa[2] to B
establishing connection 'usa' failed

it's anything wrong?

on centos, installing strongswan doesnt give 'ipsec' command. do you install openwan and strongswan? I am having big issues getting this to work on a centos machine.

use strongswan start

Just FYI - in 2024 , have got a Debian 12 communicating to an MX84 and MX100 both running MX 18.107.2 using the following changes in the ipsec.conf

 ike=3des-sha1-modp1024!
 esp=3des-sha1!

The rest bar the obvious typos in the ipsec connection and unsupported # in the xl2tp and remove the lock in the config in the original is the same.