Tag: IP address

Aug 15

How to: Configure Dynamic DNS Service on the Unifi Security Gateway via config.gateway.json

How to: Configure Dynamic DNS Service on the Unifi Security Gateway via config.gateway.json Thankfully the latest versions of Ubiquiti’s Unifi Controller allow the user to configure dynamic DNS services via the Web UI. However, there are cases when you rather keep the configuration on the config.gateway.json file. In my case the main motivation to use …

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Aug 09

Google IP address ranges

Google IP address ranges Recently I decided to try the Google Compute Engine Cloud, and one of the things I liked right from the beginning was the ability to connect via SSH to your Ubuntu box. I am going to have to read a bit more about it but basically it seems like it generates …

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Jul 10

How to: Assign multiple IP addresses to one interface in Ubuntu using the Command Line Interface (CLI)?

How to: Assign multiple IP addresses to one interface in Ubuntu using the Command Line Interface (CLI)? I have been working with Ubuntu more lately and ran into the need to direct traffic going to one server (via IP) to go to a new server but I couldn’t change the client’s configuration. Because part of …

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Jul 10

Resolved: DNS Lookup Order with VPN on OSX

Resolved: DNS Lookup Order with VPN on OSX Question: Why can’t I access intranet resources over my VPN connection? After performing an update on my Mac I wasn’t able to access intranet resources over my VPN connection. Further troubleshooting revealed that via IP address I could access servers but the DNS resolution wasn’t working. Answer: …

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Mar 16

How to: Configure a Dynamic DNS Client (DDClient) with NameCheap?

How to: Configure a Dynamic DNS Client (DDClient) with NameCheap? Recently I came across a new set of DNS service providers that offer Dynamic DNS services (for free!) One that I ended up really liking was NameCheap. They have a nice user interface, and what’s best is that you can use your own domain name …

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Mar 16

How to: Clone the mac address for the WAN interface on a Ubiquiti Unifi Security Gateway

How to: Clone the mac address for the WAN interface on a Ubiquiti Unifi Security Gateway Background Nowadays you somewhat expect that cloning a mac address on a gateway/router would be a basic feature… but as Apple has taught us we don’t know what we want even if we need it. But getting back into …

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Nov 17

Resolved: Reverse mapping checking getaddrinfo for {Reverse DNS hostname [IP Address]} failed – POSSIBLE BREAK-IN ATTEMPT!

Resolved: Reverse mapping checking getaddrinfo for {Reverse DNS hostname [IP Address]}¬†failed – POSSIBLE BREAK-IN ATTEMPT! If you start looking at the SSH log: “/var/log/auth.log” you might come across a lot of “Reverse mapping checking getaddrinfo for {Reverse DNS hostname [IP Address]} failed – POSSIBLE BREAK-IN ATTEMPT!” messages. In my case I only had login attempts …

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Oct 26

How to: Create a Self Signed Certificate in Ubuntu

How to: Create a Self Signed Certificate in Ubuntu Many¬†times during the initial phases of a Web Server deployment we are in need of testing secure communications (and its configuration) using a certificate. Unfortunately we might not have a valid certificate from a certification authority at the time. There are also other scenarios were you …

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Feb 28

How to: Use NginX as a Forward Proxy server

How to: Use NginX as a Forward Proxy server Generally people use NginX as a Reverse Proxy server, which is what it was designed for. However, after working with NginX for sometime now, I realized conceptually a proxy server could work both ways, right? The thought is an interesting one but its market might be …

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Feb 24

How to: Have WordPress communicate with MySQL via Socket

How to: Have WordPress communicate with MySQL via Socket As I keep looking into how to improve the performance of website one of the recurrent points mentioned is to use Linux sockets where possible. I really don’t have much experience and I can see how avoiding the TCP stack might help but I figured at …

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