[Semibug] DDNS & PTR

Anthony Cascianelli acascianelli at icloud.com
Fri Apr 19 20:47:19 EDT 2019

Comcast will sell you a static IP address. But you might be surprised at how seldom your Comcast IP changes. I’ve been in my current house for over 2 years and I’m pretty sure it’s never changed.

How are you running a mail server on residential Comcast service?  I thought they specifically blocked inbound on those ports.

Whose late you hosting your domain name through?  I use Namecheap and they offers a DDNS update service. 

Anthony Cascianelli

> On Apr 19, 2019, at 8:29 PM, Mark Moellering <markmoellering at psyberation.com> wrote:
> How hard is it to get a PTR record for a dynamic (home) IP?  I am running my own email server and Comcast demands a PTR
> I think you can do it with DDNS but I am not sure of the best place to set that up.  Any pointers?  Is there any way to buy IP addresses and just have them forward to my home IP. or is that laughably difficult?
> Thanks, and I hope this makes it to the list
> -- Mark
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