Posted 3/30/2019 19:34 (#7410722 - in reply to #7409100) Subject: DNS, IP address primer
For those who are interested in more details, but sometimes get mugged down into the nerd-bog, here's something to help you get unstuck
DNS - Domain Name Service - is the only system computers, cell phones, etc use to de-code the www.newagtalk.com into a machine-understandable code called an IP address. DNS on my ISP in NC Iowa converts www.newagtalk.com to 184.108.40.206 - there is a very solid chance your ISP's DNS will point you to a different IP addy for NAT.
IP address - internet protocol address. Every single thing that is attached to the internet has a unique IP address. If you want to get to NAT on your web-browser, you can either type in www.NewAgTalk.com OR, you can type in the IP address 220.127.116.11. Since it's easier to remember NewAgTalk than the IP address, the DNS system was implemented. Dipping slightly into the nerd-bog, the IPv4 internet addresses had four groups of numbers, which the number sets in each quad could range from 0-254. There is a wild card number for IPv4 in 255. So if you look in your router settings, you will find a subnet mask with 3 sets of 255 in it, allowing any/all IP addresses to talk to your router. Dipping a toe in the nerd-bog, because with only 4 groups of 3 numbers in IP addresses severely limited the number of IP addresses available, in 2017, IPv6 was accepted internationally, gradually replacing IPv4. The main differences are the SIX groups of FOUR alpha-numerical characters that are used as IP addresses. Each of the six groups are not limited to a 0-255 range. By including the letters, each digit can be something 0-9 and/or A-Z for a total of 36 possibilities per character.
DIAGNOSING DNS ISSUES - If you used to be able to get to a web-page, but now you can't, either
a.) The web-page no longer exists
b.) The web address you typed into your web-browser was mis-typed - diagnose by NOT USING bookmark links. Actually type in the web-site into the browser. Check variants - NewAgTalk uses a secured log-in, of similar levels of security as your bank or e-mail. Look at the beginning of the address for the "S" at the end of HTTPS. If the "S" is missing, you have not logged into NAT yet. You can also try each of the following, as they will each get you to NAT:
c.) The DNS system you're using is messed up - VERY unlikely, but does happen. For your diagnosis, go to a command prompt and type
ping newagtalk.com - your computer should have four replies back to you. This is similar to a submarine sonar pinging the ocean floor, Red October, Sea Wolf, etc..
Another test of the DNS is to type in NSLOOKUP newagtalk.com - this tests your DNS to see if it can do it's work.
Want to see something really kinda nerdy-cool, type in tracert newagtalk.com - this will show you the route your computer has to take to get to the nearest NAT content provider. Mine took thirteen hops to get from my laptop to NAT.
d.) Your computer/phone tries to please you, so it stores the DNS lookup into cache so the next time you want that site, it can quickly look up the IP in the cache. Others have nicely explained how to clear the cache.