Text for TTL in DNS Zone Templates
When editing DNS-Zones, "Default TTL" would be a better expression for "TTL", as the TTL for the SOA is the "Minimum". $TTL ist the default for a zone file.
10:50:23. [root@dns]:~# head -n8 /usr/local/ispconfig/server/conf/bind_pri.domain.master $TTL {tmpl_var name='ttl'} @ IN SOA {tmpl_var name='ns'} {tmpl_var name='mbox'} ( {tmpl_var name='serial'} ; serial, todays date + todays serial # {tmpl_var name='refresh'} ; refresh, seconds {tmpl_var name='retry'} ; retry, seconds {tmpl_var name='expire'} ; expire, seconds {tmpl_var name='minimum'} ) ; minimum, seconds ;