DNS TTL for only specific DNS Names and IPs

a company business has service trying contact on internet. have requested set ttl dns , ips on specific port 0. im having hard time understanding asking for. thought dns ttl set registrar. , can have ttl on ip address? doesnt make sense tome. asking screen shots of nslookups of 3 ips on port 1443 , want see ttl set 0. how on sbs2011/server2008r2? obvously want on 3 ips , dns name, dont want set whole dns infrastructre ttl of 0.

ttls dns records. , records have nothing ports. don't know they're asking.

the ttl determines how long dns server cache record (put dns console in advanced view, @ cache folder has been queried , can see time counting down refreshing window), , how long querying client cache in local client side resolver cache (as seen running ipconfig /displaydns), until has re-query record.

tcp 1433 sql. want open (port translate) sql internet? not idea.

maybe if can describe project , expected end result, can provide specific comments , assistance. 

*

fyi... can set ttl specific record, assuming that you manage own public records. if don't, you'll have ask whomever does. example, manage 20 customer public zones. when create a record, have option alter ttl, otherwise sets 7200 seconds, iirc. set lower say, 60 seconds, when need make change in record. way doesn't stay cached long on querying dns servers , hosts , change takes effect immediately. setting 0 means nothing's caching it.

---

ace fekay
mvp, mct, mcse 2012, mcitp ea & mcts windows 2008/r2, exchange 2013, 2010 ea & 2007, mcse & mcsa 2003/2000, mcsa messaging 2003
microsoft certified trainer
microsoft mvp - directory services
complete list of technical blogs: http://www.delawarecountycomputerconsulting.com/technicalblogs.php

this posting provided as-is no warranties or guarantees , confers no rights.

Windows Server  >  Network Infrastructure Servers