When I executed xl2tpd I amhaving following error.
# xl2tpd -D xl2tpd: parse_config: line 13: data 'ipsec sared=yes' occurs with no context xl2tpd: init: Unable to load config file
When I remove the "line 13" I having same error with "Line 14" thefore I do not think that the problem is about "ipsec sared" Here is my configuration file xl2tpd.conf.
LINUX Ubuntu 12.0.4 ;Openswan IPsec 2.6.37; xl2tpd version: xl2tpd-1.3.1
; [global] ipsec sared=yes listen-addr=184.108.40.206 ; [lns default] ip range = 192.168.1.10-192.168.1.20 local ip = 192.168.1.1 require chap = yes refuse pap = yes require authentication = yes ppp debug = yes pppoptfile = /etc/ppp/options.xl2tpd length bit = yes name=LinuxIPSECVPN
ANSWER:(since have not enough reputation I am writting it over here.) removing the ";" character at the beginning of [global] and [lns default] have solved the issue. At fist I tought that [global] and[lns default] were just a comment.