yum install xl2tpd
https://pkgs.org/search/xl2tpd
/etc/xl2tpd/
[lac mai] lns = l2tp.mai.local redial = yes redial timeout = 10 require chap = yes require authentication = no name = CaseSensitiveUserName ppp debug = yes pppoptfile = /etc/ppp/options.xl2tpd require pap = no autodial = yes tunnel rws = 8 tx bps = 100000000 flow bit = no
/etc/ppp/options.xl2tpd
asyncmap 0000 name CaseSensitiveUserName remotename L2TP ipparam beeline connect /bin/true mru 1460 mtu 1460 nodeflate nobsdcomp persist maxfail 0 nopcomp noaccomp noauth novj novjccomp noipx nomp refuse-eap refuse-pap unit 0 logfile /var/log/ppp/ppp.log
/etc/ppp/chap-secrets
# client server secret IP addresses CaseSensitiveUserName * <password> *