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network

DIG and WHOIS returning different name servers

Last updated on August 27, 2018 by Sal Ferrarello

You can look up the name servers associated with a domain name using either “whois” or “dig NS”. In some rare occasions, I have gotten back two different answers using these two techniques. In my experience, “dig NS” is the more trustworthy of the two.

Warning! This is a draft, not a finalized post. See full draft disclosure.

Filed Under: Dev Tips, Draft Tagged With: command line, DNS, network

DNS Name Servers by Company

Last updated on January 5, 2018 by Sal Ferrarello

I’ve started compiling a list of name server domain names and the companies associated with them. This list has been helpful in guiding clients to the correct company to contact when modifying DNS records. You can determine your clients’ name servers by using a command line utility like whois or dig (e.g. whois salferrarello.com or […]

Filed Under: Dev Tips Tagged With: DNS, network

Mac pfctl Port Forwarding

Last updated on March 31, 2015 by Sal Ferrarello

Historically, I used ipfw from the command line to do port forwarding on my Mac. Unfortunately, as of Yosemite OS X 10.10 ipfw has been removed. (In all fairness, ipfw has been deprecated for some time but I continued using it because it was way easier than pfctl on the command line). Command Line pfctl […]

Filed Under: Dev Tips, Programming Tagged With: network, vagrant, VVV

Network Neutrality, Open Letter to the FCC

Last updated on July 15, 2014 by Sal Ferrarello

Net neutrality is a fundamental principal of the Internet and should be defended. ISPs herding users to sites of their choosing is a gross abuse of their power. My ISP is a pipe of information delivered to my home. I pay for a pipe that is capable of carrying a certain amount of bandwidth each […]

Filed Under: Computing Tagged With: network

Command Line DNS Lookup with dig

Last updated on April 21, 2017 by Sal Ferrarello

dig is command line DNS Lookup program pre-installed on *nix and Macs. If you don’t have access to dig from the command line, there are some websites that offer a web interface to dig (e.g. Google Toolbox’s Online Dig). Basic Lookup (Similar to ping) dig example.com Advantages over ping: Doesn’t get grumpy when you include […]

Filed Under: Computing Tagged With: DNS, network

Find Your Local IP Address

Last updated on November 13, 2013 by Sal Ferrarello

Find Your Local IP Address on Your Mac ipconfig getifaddr en0 (primary) or ipconfig getifaddr en1 (secondary) How do I know which to use? It is common for Mac laptops to have one (wireless only) or two (wired and wireless) network connections.  When a wired connection is present, it is the primary connection (with wireless […]

Filed Under: Computing Tagged With: network

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