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===Setup===
Install the packages first as root user:
====Configure Openswan====
*Edit '''''/etc/ipsec.conf''''' with your favorite editor and update as follows ('''NOTE:''' Replace the ''{HDA IP Address}'' i.e. 192.168.0.10 and xxx.xxx.xxx.xxx/24 i.e. 192.168.0.0/24 with the correct IP addresses for your network):
protostack=netkey
nat_traversal=yes
leftprotoport=17/1701
right=%any
rightprotoport=17/%any}}</pre>
* Add the following to '''''/etc/ipsec.d/hda.secrets''''':
* Edit '''''/etc/sysctl.conf''''' and add following to the file:
net.ipv4.conf.default.accept_redirects = 0
net.ipv4.conf.default.send_redirects = 0}}</pre>
* In the same file, disable the following by adding a #:
<nowiki>#</nowiki>net.bridge.bridge-nf-call-iptables = 0
<nowiki>#</nowiki>net.bridge.bridge-nf-call-arptables = 0}}</pre>
* To enable changes, do the following:
* Create '''''/usr/bin/zl2tpset''''' and add the following:
for each in /proc/sys/net/ipv4/conf/*"
do
echo 0 > \$each/accept_redirects
echo 0 > \$each/send_redirects
done}}</pre>
* Make it executable
* Add the following to '''''/etc/rc.local''''' so this script runs on boot:
* To verify everything is set correctly, do the following:
* Edit '''''/etc/xl2tpd/xl2tpd.conf''''' and update to reflect as follows:
'''NOTE:''' The IP range is outside an actively used IP range. For example if your DHCP server assigns IPs between 192.168.10.10 and 192.168.10.100 you can use 192.168.10.150-192.168.10.200. Also, xl2tpd needs a local IP which is used for communication with PPP. Given example, you could use 192.168.10.101.
ipsec saref = no
ppp debug = yes
pppoptfile = /etc/ppp/options.xl2tpd
length bit = yes}}</pre>
====Configure PPP====
* Add following to '''''/etc/ppp/chap-secrets''''' (replace username and password accordingly):
* Check '''''/etc/ppp/options.xl2tpd''''' to verify that all ''ms-dns'' entries point to the correct nameservers (the HDA).
*Start xl2tpd:
====Configure Router====
====Set Services to Start on Boot====
That's basically it, you can now setup your L2TP/IPsec VPN client and try to connect.
