Dear guys, hi!
Could you please be kind advising me on some network related questions? :)
I have Multiple domain on single IPv4 address. My idea is to set up my host identification not as a single FQDM that is set in HOSTNAME file in /etc but to be dynamically changing, for mail headers. For example, when I refer to a smtp to send mail on smtp.example1.com, on ip 188.8.131.52 I would want in email header Postfix set:
Received: from host.example1.com (host.example1.com. [184.108.40.206])When I refer to smtp.example2.com, then I wish the following could appear:
Received: from host.example2.com (host.example2.com. [220.127.116.11])All host.example1.com, host.example2.com and etc are having reversed zone setup. If you try them then you see that it's resolve to 18.104.22.168. I and rDNS when you enter 22.214.171.124 is resolved to only one main FQDM. In case Postfix sets the settings above it would be possible - then my question is how to do it? If it's simply done with recipients' server by sending rDNS check then I suppose there is not much I could do? Besides I have IPs 126.96.36.199, 188.8.131.52 and so on - is there a way for my Postfix use them in header as they are rDNS resolved to host.example5.com, host.example6.com respectively? Why Postfix tends to use my only 184.108.40.206 (Virtualmin's shared address) what about the one I just mentioned above (220.127.116.11, 18.104.22.168)?
What is short name in
/etc/hosts? For example,
22.214.171.124 superhost5.example1.com SuperHost- that last SuperHost is said to be a short name? Where does it appear? I tried applying network configuration with so called short name and didn't notice any difference?
Before GMail identified my IP as ipv6 now as I change something (I suppose after I don't setup free IPv6 addresses) it only shows ip4v? How does it work?