I always thought a domain was a collection of machines related in some way. When I ping a domain name, like google.com, how come just one IP address is returned? What is this IP referring to?
To quote centos.org BIND documentation:
Zone File Resource Records
...
A — Address record, which specifies an IP address to assign to a name.
<host> IN A <IP-address>
Figure 14-7. Sample A record configuration
If the <host> value is omitted, then an A record points to a default IP address for the top of the namespace. This system will be the target of all non-FQDN requests.
Consider the following A record examples for the domain.com zone file:
IN A 10.0.1.3
server1 IN A 10.0.1.5
In the above, 10.0.1.3 is the IP of the domain. E.g. if the above was the zone file for domain example.com, ping example.com would ping 10.0.1.3. Each domain has this "default" IP address and, as is the case with server1 above, other IPs.
As a side note, you can have multiple IPs pointed by the same DNS name - this is used for load balancing (see e.g. this or this). To see this, doo nslookup google.com.
A domain name is simply a human-friendly pointer to an IP address.
The IP address is referring to the address of the machine that particular domain name points to. This is determined by using DNS.
Some larger domains, like google.com, do indeed have many IP addresses associated with them, for redundancy reasons. Because these additional IP addresses are assumed to return the same content, most programs, including ping, just return an arbitrary one. If you wanted to see all these IP address, you can use the dig program.
Related
I am a co-maintainer of a slash-number network, which has a DNS domain sub.dom.tld assigned. The used name server is ISC bind 9. Everything is working as expected:
queries from inside and from outside that network for host.sub.dom.tld return the expected IP address
queries from inside and from outside that network for IP addresses within the network range return the correct FQDN.
I'm asking: which DNS zone would return the IP address for the DNS domain sub.dom.tld itself?
Is it the DNS zone dom.tld, which I do not control. Or is it the DNS zone sub.dom.tld, which I control. In case it is the latter, how would the syntax look like?
It is not clear to me how to specify it. The entries for individual hosts in the forward zone look like host IN A IPv4.
When I'm accessing any host via IP address, it is showing SSL error.
Example.com => 192.168.1.1 (IP address)
Suppose if I want to access https://example.com, it works fine.
If on the other hand, accessing the hosts by its IP address like https://192.168.1.1, it shows SSL Error.
Is there any configuration missing here. Do I need to add the IP address in SAN configuration?
If you want to access a web site by IP address you need to first configure your web server to actually provide this web site on this IP address and then you have to include the IP address as SAN into the certificate served at this IP address. Note that there are different types of SAN: DNSName and IPAddress. The correct type would be IPAddress but some clients actually wrongly expect type DNSName - so you better add the IP address with both SAN types.
Hope someone can help...
I have two websites, on two different Droplets (with different IP addresses) hosted on Digital Ocean.
Both websites use the same domain, the first website is mysite.com and second website is example.mysite.com
I need to edit my SPF record so it can allow both IP Addresses to to use the domain mysite.com
When I use the correct IP Address the SPF record below works (for one of the websites).
v=spf1 ip4:167.XX.XXX.40 include:spf.protection.outlook.com -all
Let's say one droplet IP address is: 167.XX.XXX.40 and the other IP address is 167.XX.XXX.247
How would I add both to the same SPF record?
You would just include it after your first IP address. So
ip4:167.XX.XXX.40 ip4:167.XX.XXX.247
in that line you show
Note: I looked at mine and I have the letter 'a' before those and I don't recall what the "a" is for.
I'm trying to find the authoritative name servers for a given IP address and as far as I can see the only way to find the name servers is by using the domain name of the IP.
How do I convert the IP to domain name (not hostname)?
Or how do I find the authoritative name servers for any IP address?
You can use dig to get PTR RR, for example:
dig -x 8.8.8.8
I have Static IP, i would like to access website using static IP as well using domain name.
I have below DNS entries to for my domain, i am not sure what setup i need to do to make it works.
when user access my site using domain name they should be able to access. Also when someone want to access using IP address they should be able to do that.
www 14400 IN CNAME example.com
example.com 14400 IN A 50.63.147.111
If anybody have idea please let me know.
Thank you
Regards,
Mona
If you can't access your IP address, then it isn't because of your DNS. DNS stands for domain name system and translates domain names TO IP addresses. Thus, you must already have a reachable IP address for your A record to be meaningful. Make sure that you've configured your server correctly (Apache?) and that the necessary ports are open in your firewall (iptables).
Check that your domain registrar is pointing its name servers to the authoritative name server (the server with your zone file) for your domain.