<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On 7 Sep 2018, at 16.20, Roger Lipscombe <<a href="mailto:roger@differentpla.net" class="">roger@differentpla.net</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><span style="caret-color: rgb(0, 0, 0); font-family: SourceCodeProForPowerline-Regular; font-size: 13px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class=""><span class="Apple-converted-space"> </span>We want a fairly short TTL</span><br style="caret-color: rgb(0, 0, 0); font-family: SourceCodeProForPowerline-Regular; font-size: 13px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: SourceCodeProForPowerline-Regular; font-size: 13px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">(because otherwise how would health-check failover work?). I'll</span><br style="caret-color: rgb(0, 0, 0); font-family: SourceCodeProForPowerline-Regular; font-size: 13px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: SourceCodeProForPowerline-Regular; font-size: 13px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">explicitly cache the IP address and refresh it after each N messages</span><br style="caret-color: rgb(0, 0, 0); font-family: SourceCodeProForPowerline-Regular; font-size: 13px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: SourceCodeProForPowerline-Regular; font-size: 13px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">sent.</span></div></blockquote></div><br class=""><div class="">I would implement a side process that re-resolves DNS every N seconds and then notifies your sender process with IP address. </div><div class=""><br class=""></div><div class="">or change DNS settings to few seconds to benefit from OS feature. Keep in-mind that OTP has custom resolver. I’ve not hacked and do not know all details but it might have an explicit cache feature. It worth of checking.</div><div class=""><br class=""></div><div class="">- Dmitry </div><div class=""><br class=""></div></body></html>