IPv6 with Synology RT2600ac via HE tunnel


Very quick and dirty steps required to get IPv6 over IPv4 working in your Synology RT2600ac.

Head over to https://tunnelbroker.net and create an account. Create a tunnel service and note down the following details:

IPv6 Tunnel Endpoints

  • Server IPv4 Address
  • Server IPv6 Address
  • Client IPv4 Address
  • Client IPv6 Address
  • Routed IPv6 Prefix

Open the SRM admin page open the “Network Centre” app.

Select “Internet”. Under the “Connection” tab click the “IPv6 setup” button. Select the following settings:

  • IPv6 Setup: 6in4
  • Prefix Length: 64
  • Prefix: {ROUTED IPv6 PREFIX AS ABOVE} You dont need to include the trailing /64. Its already entered for you.
  • Remote server IPv4 address: {SERVER IPv4 ADDRESS AS ABOVE}

Press “Okay”.

Back in the “Network Centre” app, select “Local Network”. Under the “IPv6” tab, tick the box to enable IPv6 and select your “Prefix” from the drop down menu. Press Apply.

Now onto validating and testing.

Back in the “Network Centre” app, click on “Status”. Next to the “Internet Connection” heading, click the little drop down and select IPv6. It should say “Connected”.

Finally, check a client machine in your local network and make sure it has an IPv6 address auto-assigned. From that machine browse to http://ipv6-test.com/



Missing Instant Hotspot on MacOS


One problem that keeps coming back on my MacBook Pro is that the Instant Hotspot option in the WiFi menu (in the menu bar) disappears.

Don’t confuse this with the Personal Hotspot feature of your phone. Instant Hotspot is part of the Continuity suite that uses your AppleID to make your iPhone’s hotspot feature available to your Mac even if the iPhone has the Personal Hotspot turned off.

After spending some time googling around for solutions to the missing option I worked out that I had to be searching for “Instant Hotspot” instead. I then started to get somewhere.

The fix that worked for me was step three from here.

I had to sign out of iCloud on my Mac and then sign back in. I didn’t have to do it on the iPhone.

Ive hit this issue three times now. No idea what the cause was tbh.

Useful man pages in your browser


A new useful *nix tool popped up in my Twitter timeline a while back.


Lede says Simplified and community-driven man pages and it does what it says on the tin.

If you’re a *nix admin you know the drill of looking up man pages for *nix tools. You’re solving some problem and need to grok an *nix command options and/or refer to a sample of how the tool is used. man {toolname} is the way to do it.

Frequently though the result is usually page and pages of esoteric information about the tool most of which you will never learn and will take you a lot of time to wrap your brain around. Sometimes there will be examples, waaay at the bottom of the page and often those usage examples are pretty light on information.

This is where http://tldr.sh/ comes in. Put your *nix tool name into the sample at https://tldr.ostera.io/ and it will display useful help. Example: https://tldr.ostera.io/tar

But it doesn’t end there. The page also has many community contributed clients. Scroll down the page at http://tldr.sh/ for the full list.

My favourite use of it is to add the https://tldr.ostera.io/ as a search provider in your browser. Chrome in my case. Open your Chrome settings and add a search engine with the config as below.

Screen Shot 2017-12-21 at 11.36.16

Now, in any search bar in Chrome you can type tldr {toolname} eg tldr tar and it will display the results right there for you. A convenient way to get useful information about *nix tools.

“Shockwave Flash has crashed” workaround for vSphere Web (Flash) Client | virtuallyGhetto


Im using the vSphere Web Client everyday at the moment and will also preference the HTML5 version over the Flash (phtoowe) version.

Chrome 61.0.3163.100 breaks Flash though due to a patch for an undisclosed zero-day which was in use in the wild. Impacts Chrome on Mac and Windows.

See the post below from William Lam over at VMW.

On Saturday, I started to notice that logins to the vSphere Web (Flex) Client stopped working with Google Chrome. Upon a successful logon, it would immediately crash with “Shockwave Flash has…

Source: “Shockwave Flash has crashed” workaround for vSphere Web (Flash) Client | virtuallyGhetto

Why you shouldn’t use .local in your Active Directory domain name.


Saving this link for another day. The topic of what gTLD to give your internal AD domain comes up all too often.

Share MS doesn’t have a more up to date page about this. Bonus points if it also talks about their experiences with how best to naming things with Azure and its various identity services.

Source: Why you shouldn’t use .local in your Active Directory domain name.

Adding your vCenter Web Client as a search provider in Chrome


Most browsers these days offer a function that allows you to add other search engines to them. This function allows you to quickly search for stuff directly from your web browsers search field instead of having to open up the site directly, type in what you want and press enter.

In this article I’m going to show describe how to add your vCenter 6.5U1 HTML5 client as a custom search engine in Google Chrome.

This will allow you to search for vCenter objects directly from Chrome without first opening the HTML5 Web Client.

What you need

  • Access to an HTML5 vCenter Web Client (vCenter 6.5U1 on the VCSA was used to write this.)
  • Google Chrome (Chrome 60 was used at the time this was written)

Find your vCenter Web Client Search URL

  • Browse to your HTML5 vCenter Web Client and sign in. Its usually something like ​https://{FQDN}/ui` where {FQDN} is the URL for your vCenter Web Client.
  • From the banner at the top of the page, click on `Menu` and select `Search`.
  • Enter the name of a VM you want to search for and press `Search`.
  • Copy the URL from the address bar in Chrome. In this example we have something like this. I’ve replaced https://{FQDN}/ui/#?extensionId=vsphere.core.search.domainView&query={SEARCHTERM}&searchType=simple

Add a custom search provider to Chrome


  • Open a new Chrome tab or Window, enter your keyword and the object name you want to search for.
  • Chrome will return the vCenter Web Client search page with the term you entered.
  • $profit.

CAA checking becomes mandatory for SSL/TLS certificates


This was news to me in a few ways; first, there’s a new DNS resource record called CAA (Certificate Authority Authorization) and second, Certificate Authorities are now required to check that record before issuing a certificate, to determine if they’re allowed to do so. Cool! What’s a CAA (Certificate Authority Authorization)? When in doubt, consult the RFC: […]

Source: CAA checking becomes mandatory for SSL/TLS certificates