It's quite unusual for a router to have a hardware fault or your ISP to be experiencing a complete loss of service so these guides will certainly help.
Whether you are getting a sluggish experience, appear to be offline, or need help troubleshooting email issues it's worth having a look here and to get a good understanding how things work and diagnose an issue through a process of elimination.
Testing your ISP for speed issues (TAP3)
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If you suspect your ISP is to blame for your slow internet speeds you may want to perform an additional TAP3 speed test.  This test tests the circuits speed idependant of your ISP and therefore allows you to confirm if the issue is down to your ISPs network.

A TAP3 test can only be used for connections which run over a BT landline (e.g. ADSL or FTTC).

How to speed up your internet using DNS
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Want faster webpage loading times? Who doesn't?

You internet connection speed may not be the only contributing factor when it comes to a more responsive online experience.  Using an alternative to your the ISPs default DNS servers may result with significantly faster loading times, especially in the case of more content rich websites.  You may also be able to prevent accidentally loading content from website identified with malware.

What is a 30-30-30 reset?
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Having serious problems with a router?  Have you made a mess with the configuration or has it become corrupted?  Performing a 30-30-30 reset (hard-reset) may resolve your issue.

This technique, known to only a small number of technically savvy network engineers, may save you replcaing a router which isn't working.  What's more, it's really simple!

What is SIP_ALG?
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SIP_ALG (Session Initiation Protocol_Application Layer Gateway) is often the root cause of problems using modern VoIP solutions.  Whether you are experiencing one-way voice, calls cutting out, handset not ringing as expected, or devices failing to connect or register correctly, SIP_ALG is one thing you need to be aware of.

Here is an explanation of what it is, why it was implemented in the first place, why it should be disabled on most modern VoIP networks.

Connectivity Diagnostic Guide
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If you are experiencing issues with gaining access to the internet the issue could be down to your ISP, your router, or the device you are using.  

Before going to your ISP and shouting at them, it's a good idea to perform some basic Firstline Checks to make sure the issue is actually your connection and not something on site.  In most cases, the issue is likely to be something within your premises so this guide will really help.

How to change the TCP/IP details on Windows
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Occasionally you may need to change the network adaptor settings within Windows so you can specify a local static IP Address or change the DNS servers your computer is using (as seen in this article).  This can help with ensuring your computer is connecting to the right network or all you to run tests.

Check out this guide if you would like to learn more.

Reverse DNS explained
image coming soon If you are sending emails through your ISP it is possible your emails may be bounced by the recipient if Reverse DNS (rDNS) has not been configured.  This guide tells you what this is, what Forwarding DNS looks like, and when you do or do not require rDNS.
DHCP Explained
image coming soon What is DHCP?  What does it do and why do I need it enabled on my router?  All these questions are answered within this article.
Troubleshooting a local network issue
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So you've alled your ISP and they've told you there is nothing wrong with the internet connection and the issue is "something on site".  What do you do now?

Trying to find why you computer or mobile device cannot access the internet or other devices within your network can be very tricky.  There are lots of places where things can go wrong.  Fortunately for you, we have some tips on where the issue may be and how you can get things working again.

Internet Security via DNS
image coming soon You can add an additional level of secuirty and wedsite filtering by simply using more secure DNS servers.  This can be useful if you want to block adult content of sites reported for phishing/malware across all devices on your local network.  Here is a useful guide on how to achieve this.
Troubleshooting DNS and MTU issues
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If you are having problems with websites displaying but your internet connection appears to be working, you could have a DNS or MTU issue.  Although both are not directly linked, symptoms could relate to either.  So if you are looking to try and isolate which is at fault, here is a little guide which will help you.

Identifying Packet Loss
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If your internet connection is unstable or feels sluggish, you may be experiencing packet loss.  This can happen anywhere between your computer and the destination server and the cause could be within your network, on the circuit itself, or somewhere on the internet.

This guide will help identify where the issue is.

Diagnosing a Slow Speed Issue
image coming soon Having a sluggish internet experience can be extremely frustrating and can prevent you from performing specific online tasks such as streaming video or using VoIP (Voice over IP).  This guide should really help.
Directly connect your PC to your VDSL modem
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If you are still using a BT VDSL modem or an NTE (Network Terminating Equipment) to which you connect your router, you may want to test the connection without all the other onsite equipment attached.

This guide will help you set up your Windows computer so you can isolate an issue which may be down to your router (or other onsite equipment), VDSL modem/NTE, or the connection itself.