Always Networks Blog - Misc

Always Networks is now Serverless!

Fri 21 December 2018

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This blog has now been moved on to AWS using entirely serverless technologies, meaning both reduced cost and better performance.

To do this, a number of technologies have been employed to automate the deployment. As there is really only one Always Networks site, a lot of this was probably a lot more effort than it could have been - it would probably have been easier to …

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Testing a 1 Gb Internet circuit

Wed 26 April 2017

Have you ever needed to prove a gigabit Internet circuit? It's more of a headache than you'd think. I had to prove one recently - we were seeing some errors which seemed to happen every time the bandwidth went over about 400mbps outbound, so we needed to prove we could push more. We could ask the ISP to run some tests - but I'm an untrusting kinda …

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Off-site backups for Synology NAS - using two raspberry pi's, behind dynamic NAT IP's

Tue 08 November 2016

I recently bought a 4 bay synology NAS (DS416 Play), to move away from Dropbox and OneDrive. The main issue I had before choosing to do this, was off-site backups. It's ok having 4 disks for resilience, but if my house burns down or gets burgled, I still lose everything.

So I started to think up ways of doing an offsite backup, without having to …

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What is ARP?

Thu 20 August 2015

A number of times in the last few weeks I have been asked by a number of people:

What is ARP?

There is the simple answer - which is simply a definition:

Address Resolution Protocol (ARP) is a mechanism to resolve IP addresses into MAC addresses.

However...that doesn't really explain a lot. It probably doesn't explain anything you didn't already know. To really understand ARP …

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Why am I seeing packets on my server that aren't for this server?

While troubleshooting a totally unrelated issue, one of my colleagues noticed that they were seeing packets in a tcpdump that were neither destined for nor sourced from the server. This is odd, when plugged into a switch, so we started digging.

Server 1, was sending a stream of packets to Server 2 - in a different subnet somewhere. Sometimes, although rarely, these packets could be seen …

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