Can I have one IP address and many names?
but one dns name resolves to only one address right?
So I can buy multipe domain name and register all to one ip?
Related
Is it possible to access the iDRAC from multiple IP addresses?
If so, how do I add the multiple IP to iDRAC?
Could you please help me with this?
There is an option in iDRAC to add only one IP address for public access, but how do I add or assign multiple IP addresses to access iDRAC?
I want to host multiple sites with different domains on a single IP address. Shopify for example says you need to set the A record of your domain to 23.227.38.65 . This IP address is the same for all Shopify stores. When I goto the IP address directly I get Cloudflare Error 1003: Direct IP access not allowed. How do companies host multiple sites with different domains onto a single IP address with Nginx for example?
And how does Shopify distinguish the request with a direct request and a request from my store? Only the domain name?
I recently got to know about DHCP that it dynamically assigns ip addresses to a computer. But what if two DHCP servers across the world assign a same ip address to two different computers. Doesn't it conflicts with the uniqueness property of ip addresses.
For example two DHCP servers assign ip address x to computer1 and computer2 and i wanted to send a mail to computer1 by looking at DNS server it should be send to ip address x. But there is a conflict as two different computers have same ip address x. could someone please clear my doubt.
Let say I want to contact a server whose domain name is example.Com and ip address stored in DNS server is 127.18.1.1 and DHCP changes the ip address for this server to some random value 127.19.1.1 then how is the address resolved since I'm contacting to example.com which has 127.18.1.1
There are a number of ways that this problem is avoided.
Firstly, by keeping networks small, segregating machines into specific functions, geographic areas, etc you reduce the risk of having a large pool of addresses in use.
Secondly, if you must have multiple DHCP servers on a network, then the address space should be split between them. So if you have 192.168.0.0/24, one server would handle 192.168.0.0/25 and another would handle 192.168.127.0/25
Thirdly, most DHCP servers will ping the IP address that they are going to offer before offering it. If the address gets a response it will be marked as Conflicted and won't be offered again.
I have got one firewall, with a public IP (dynamic) provided by my ISP.
As the IP is dynamic, I registered a domain in the service NO-IP as not to worry whether the IP changes anymore.
The problem:
Looks like my ISP is also giving a name for that IP, so when I resolve it (standard DNS configured, such 8.8.8.8) it would resolve the name in favour of my ISP.
The key point:
¿Is there any way to "OVERRIDE" the name given by the ISP with the one registered in NO-IP, in order to ALWAYS resolve to the no-ip name?
Thanks!
Whatever you did with NO-IP/DDNS, it will have no effect on Reverse DNS lookup. Reverse DNS is controlled by whoever "owns" the IP address, usually your ISP, so they would have to change the record according to your request (or sub-delegate it to your DNS servers) which they will almost certainly not do since you have dynamic IP address.
All,
I have an IP address and I want to know all aliases within my organization that point to this IP. Is it possible?
For example I know the alias "TESTBOX" points to 119.119.119.119.
How can by just knowing the IP come up with the "TESTBOX" ?
Thanks,
M
Short answer: You can't.
You can try a reverse lookup on the IP address, but that will only show you the address that has been specifically allocated in the reverse DNS to that IP address.
Remember, aliases might exist only as an entry on a single machine's hosts file. They might also exist in a DNS server on the other side of the planet. However, if you're only interested in local DNS aliases, and your DNS servers allow zone transfers, then you can try listing every entry in every domain (eg. with host -l xyzzy.bigcorp.com) and searching the results for the IP address in question.