Quote:
Originally Posted by DavidJ
Thanks for the enlightenment. But I have read in Wikipedia that the one you have made an example is just a subnetwork. This link would explain what is subnetting: Subnetwork - Wikipedia, the free encyclopedia
I might be wrong with my understanding with subnetwork so a very explanation about it would be very much appreciated. |
You are wrong, or misinformed again. Although those addresses all might be part of a google subnet, its still not limited to a subnet.
please have a look here for more information on round-robin DNS (multiple A records per domain):
Round robin DNS - Wikipedia, the free encyclopedia
Subnetting is just a way of dividing up a network.
Again like I said earlier, the act of having more than one A record per domain is called round-robin DNS. It is possible, the IPs don't have to be related in any way. For example I could have the IPs for domain.com point addresses in the United States, Mexico, Africa, and China all at the same time in completely different IP networks.
To help prove my point here is a dig of yahoo.com clealy showing multiple IP addresses NOT in the same network (subnet)
[root@server1 ~]# dig yahoo.com A
; <<>> DiG 9.3.6-P1-RedHat-9.3.6-4.P1.el5_4.2 <<>> yahoo.com A
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 11856
;; flags: qr rd ra; QUERY: 1, ANSWER: 8, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;yahoo.com. IN A
;; ANSWER SECTION:
yahoo.com. 21291 IN A 72.30.2.43
yahoo.com. 21291 IN A 98.137.149.56
yahoo.com. 21291 IN A 209.131.36.159
yahoo.com. 21291 IN A 209.191.93.53
yahoo.com. 21291 IN A 209.191.122.70
yahoo.com. 21291 IN A 67.195.160.76
yahoo.com. 21291 IN A 69.147.114.224
yahoo.com. 21291 IN A 69.147.125.65
;; Query time: 2 msec
;; SERVER: 208.67.222.222#53(208.67.222.222)
;; WHEN: Fri Feb 26 02:47:37 2010
;; MSG SIZE rcvd: 155
[root@server1 ~]#