Category Archives: Networking

SSH Tunnels Are Like a Free Cheap VPN

By Andrew Hopper1 | Published: August 21, 2009
If you’re not already familiar with the concept I bet you’d be very interested to learn that you can simulate VPN access to a network as long as you have access to a linux host on that network. These instructions work on OS X and Linux. Putty also has tunneling capabilities, but those are beyond [...]
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Use nslookup to check DNS propagation and verify MX record configuration

By Andrew Hopper1 | Published: August 21, 2009
NSLookup is a tool that can be immensely helpful when troubleshooting network connectivity issues. Here are some example uses: 1.) You want to see if the DNS change you requested in live on the primary nameserver hopper-macbook:~ andrewhopper$ nslookup > server dns1.noris.net Default server: dns1.noris.net Address: 213.95.0.65#53 > set type=a > puma.com Server: dns1.noris.net Address: 213.95.0.65#53 Name: puma.com Address: 128.167.119.25 2.) You just configured Google apps for your domain [...]
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