Client determined they didn't wish to proceed with my NBN proposal (which was, in all liklihood, more cost effective in every way.) so being a kind soul, was specific about what they needed to do/tell their provider. namely: 1. disconnect the un-used circuit, not the main circuit 2 reuse the secondary circuit to put the new nbn on 3. test it all out before cutting over 4. dhcp scope exists and is managed by the server, subnet is this. 5 port forwards are required, they are this. 6. before cutting over, if there's a new IP address, we need to adjust DNS MX records first and add a secondary. So far, end result has been: 1. At least they disconnected the corect circuit 2. I assume they put the nbn connection on this circuit 3. they did not. 4. no, we'll put DHCP on your modem thanks very much. AND we'll use an entirely different subnet. 5. Nah, not necessary. but we WILL enable UPNP 6 no, we won't do this either, so you have no opportunity to adjust the SOA and TTL details before hand 7. What do you mean, we shuldn't enable IPv6 by default, with no firewall? What do you mean, mail is being bounced across the world now because we're prioritising traffic over ipv6? I mean.. it'd be fine to turn ipv6 on, if it served much purpose, or if the pre-work was done. all the rest of it, just shaking my head.