asked on Private IP as DNS for www.xyz.com ?
if i ping www.xyz.com
it give reply as 193.190.1.1 (a private IP), how? why? whats going on
mostly its always a Public address
i think might be they are having their OWN DNS server and bonded with ISP's DNS server.
what you say Experts, what can be reason
it give reply as 193.190.1.1 (a private IP), how? why? whats going on
mostly its always a Public address
i think might be they are having their OWN DNS server and bonded with ISP's DNS server.
what you say Experts, what can be reason
DNSNetwork ArchitectureNetwork Analysis
Last Comment
sportsboy
193 is a public address 192.168.0.0 - 192.168.255.255 is the private range your thinking of
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u right my mistake, i just go lost by seeing 195
ASKER
but what if next time i ping www.xyz.com , it give different ip, say 193.190.1.10
then whats going on
then whats going on
It probably means they have more than 1 ip address in DNS for that domain and dns round robin means you may see different ip address when you ping the domain compared to the last time. If you do an nslookup on that domain it should show you all the ip addresses in DNS for the domain.
e.g an nslookup on google.co.uk shows multiple ip's
C:\Users\Martin>nslookup
Default Server: cache1.service.virginmedia
Address: 194.168.4.100
> google.co.uk
Server: cache1.service.virginmedia
Address: 194.168.4.100
Non-authoritative answer:
Name: google.co.uk
Addresses: 209.85.146.104
209.85.146.106
209.85.146.103
209.85.146.147
209.85.146.105
209.85.146.99
If you run the lookup again straight away you'll notice a different ip address is at the top of the list, this is because of dns round robin
> google.co.uk
Server: cache1.service.virginmedia
Address: 194.168.4.100
Non-authoritative answer:
Name: google.co.uk
Addresses: 209.85.146.147
209.85.146.105
209.85.146.99
209.85.146.104
209.85.146.106
209.85.146.103
e.g an nslookup on google.co.uk shows multiple ip's
C:\Users\Martin>nslookup
Default Server: cache1.service.virginmedia
Address: 194.168.4.100
> google.co.uk
Server: cache1.service.virginmedia
Address: 194.168.4.100
Non-authoritative answer:
Name: google.co.uk
Addresses: 209.85.146.104
209.85.146.106
209.85.146.103
209.85.146.147
209.85.146.105
209.85.146.99
If you run the lookup again straight away you'll notice a different ip address is at the top of the list, this is because of dns round robin
> google.co.uk
Server: cache1.service.virginmedia
Address: 194.168.4.100
Non-authoritative answer:
Name: google.co.uk
Addresses: 209.85.146.147
209.85.146.105
209.85.146.99
209.85.146.104
209.85.146.106
209.85.146.103
ASKER
so the purpose of DNS Round Robin is to be secure or what
It is for load balancing. So that all request for a service or in this case a web site don't overload one server or group of servers
ASKER
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