Installation
yum install -y install --enablerepo=epel openswan xl2tpd bind
Configure /etc/named.conf and the zone file /var/named/masters/commonidtrust.org (see examples attached). Configure xl2tpd and Openswan.
chkconfig named on
chkconfig ipsec on
chkconfig xl2tpd on
Recursion is disabled and rate limiting is set at 5 per second. Since there are a total of 3 records, this is basically impossible to use in any form of attack, ever, and it's in a personal account anyway.
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