I have changed ISP from Optus Business ADSL to TPG Naked ADSL2+. There have been a few problems during the transition which have prevented a smooth cut over.
The main problem has been that my new static IP address has not been configured properly by TPG despite being informed of the new address 10 days prior to activation of the line. This has meant that my IP changes frequently and the DNS lookups for my servers was failing. My web sites may appear to be down and inbound email delivery was intermittent.
I tried to avoid this problem up front by adding the new static IP to my DNS records. This was cunning foresight, but the problem with constantly changing dynamic IP addresses messed things up.
I also made an oversight with the TTL (Time To Live) settings for the DNS entries. I left these as 1 week which was far too high long as this meant that an incorrect DNS lookup could have been stored for up to a week before being re-checked. I have dropped this to 30 minutes until the IP address allocation has been fixed.
Good job I don’t change ISP very often. Sorry if you were having problems accessing our web sites in the meantime, however my upload speed has increased fourfold from 256Kb to 1Mb so the sites should load a lot quicker.
