Troubleshoot Mcs Connectivity

ip -6 route```
### IPv4 Routes and the Host IPv4 Route Table (inc. VPN)
```netstat -rn -f inet | egrep -i "default|0/1|128.0/1"```

<pre>
0/1      172.18.12.193  UGScg  utun3
default  172.21.92.6    UGScg  en0
128.0/1  172.18.12.193  UGSc   utun3</pre>

**Note:** We are not just looking for the default but also for any VPN that overrides the public v4 address space.

### IPv6 Routes and the Host IPv6 Route Table (inc. VPN)
```netstat -rn -f inet6 | egrep -i "default|2000::/3"```

If you have IPv6 active the above should return at least one route (as per below) via a known interface such as "_en0_ " on a Mac. 

<pre>
default   fe80:af3c:f23e:8e26:20e1%en0  UGcg   en0
default   fe80::%utun0                   UGcIg  utun0
default   fe80::%utun1                   UGcIg  utun1
default   fe80::%utun2                   UGcIg  utun2
2000::/3  utun3                          USc    utun3</pre>

**Note:** We are not just looking for the default but also for any VPN that overrides the public v6 address space.
<br>

## Debugging DHCP for both IPv4 and IPv6

To get a look at the low level DHCP configuration (Mac/Linux): 

```ipconfig getpacket en0```

<pre>
...
domain_name_server (ip_mult): {30.31.187.40, 189.74.19.55}
end (none):
...</pre>

So, in the above we are not getting IPv6 DNS servers from the DHCPv4 reply but...

```ipconfig getv6packet en0```

<pre>
DHCPv6 REPLY (7) Transaction ID 0x80940b Length 76
Options[4] = {
  CLIENTID (1) Length 14: DUID LLT HW 1 Time 668691856 Addr 51:c9:3e:bd:f5:7c
  DNS_SERVERS (23) Length 32: 2606:4700:4700::1111, 2001:4860:4860::8844
  DOMAIN_LIST (24) Length 0:  Invalid
  SERVERID (2) Length 10: DUID LL HW 1 Addr 3b:27:06:aa:62:f9
}</pre>




## Fixing Connectivity Issues with Wired and Wireless Networks

When it comes to transmitting data at the physical and data layer, you have the option to use either a wired or wireless (Wi-Fi) medium to send the data to your router.
### Troubleshooting Tips for Apple macOS / OSX
Regardless of whether you are using OSX/macOS versions like `10.11.7`, `11.5.8`, or `12.2.9`, there are various troubleshooting tools available. However, these manual actions and scripts do not provide a series of correlated values over time. This is where automated remote troubleshooting becomes crucial, especially for teams that are fully embracing remote work and Work From Anywhere (WFA).
#### Using Built-in Scripts to Assist
One useful tool on OSX/macOS is `sudo wdutil info`, which provides a dump of current wireless related settings to the CLI and can also be configured to generate specific troubleshooting logs. Moreover, the `sysdiagnose` tool can be used to generate a wide range of logs, although most of these are related to wireless only, similar to wdutil.

Running `sudo nohup /usr/bin/sysdiagnose -u &` in the background will write logs to `/var/tmp/<blah>.tar.gz` for you. Alternatively, if you prefer to run it interactively, you can do so by running `sudo /usr/bin/sysdiagnose`, which will give a privacy warning. When not run in the background, it should open Finder in the correct location, or you can navigate to `/var/tmp` using Finder or use Cmd+Shift+G to point Finder to the path. Keep in mind that the file sizes are approximately 300MB.
## Possibly Helpful Videos

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|Video | Title | Channel |
| :---: | :---: | :---: |
|<a href="https://www.youtube.com/watch?v=s0FBo08Sw4A" data-lity><img src="https://i.ytimg.com/vi/s0FBo08Sw4A/default.jpg" class="img-fluid"></a>|<a href="https://www.youtube.com/watch?v=s0FBo08Sw4A" data-lity>Solving Wi-Fi problems in record time   John Anderson   WLPC US Phoenix 2017</a>|<a target="_blank" href="https://www.youtube.com/channel/UCIzBSS46vcqhwmBZ7ZpY-yg" >Wireless LAN Professionals</a>|
|<a href="https://www.youtube.com/watch?v=EWURmcra5_4" data-lity><img src="https://i.ytimg.com/vi/EWURmcra5_4/default.jpg" class="img-fluid"></a>|<a href="https://www.youtube.com/watch?v=EWURmcra5_4" data-lity>Wireless Association &amp; Authentication Pass-Fail   Brian Long   WLPC US Phoenix 2017</a>|<a target="_blank" href="https://www.youtube.com/channel/UCIzBSS46vcqhwmBZ7ZpY-yg" >Wireless LAN Professionals</a>|
|<a href="https://www.youtube.com/watch?v=9RzmyNRK9e4" data-lity><img src="https://i.ytimg.com/vi/9RzmyNRK9e4/default.jpg" class="img-fluid"></a>|<a href="https://www.youtube.com/watch?v=9RzmyNRK9e4" data-lity>Wireless Packet Captures with Multiple Adapters   Yer Yang   WLPC Phoenix 2019</a>|<a target="_blank" href="https://www.youtube.com/channel/UCIzBSS46vcqhwmBZ7ZpY-yg" >Wireless LAN Professionals</a>|
|<a href="https://www.youtube.com/watch?v=p_K9xHxFM8Y" data-lity><img src="https://i.ytimg.com/vi/p_K9xHxFM8Y/default.jpg" class="img-fluid"></a>|<a href="https://www.youtube.com/watch?v=p_K9xHxFM8Y" data-lity>IEEE 802 11kvr   Perry Correll   WLPC Phoenix 2019</a>|<a target="_blank" href="https://www.youtube.com/channel/UCIzBSS46vcqhwmBZ7ZpY-yg" >Wireless LAN Professionals</a>|
|<a href="https://www.youtube.com/watch?v=r9oXNxgAKhM" data-lity><img src="https://i.ytimg.com/vi/r9oXNxgAKhM/default.jpg" class="img-fluid"></a>|<a href="https://www.youtube.com/watch?v=r9oXNxgAKhM" data-lity>Benefits of WPA3, Enhanced Open, and Easy Connect   P. Ebbecke, P. Correll   WLPC Prague 2018</a>|<a target="_blank" href="https://www.youtube.com/channel/UCIzBSS46vcqhwmBZ7ZpY-yg" >Wireless LAN Professionals</a>|

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