Check Wifi Internet Issues

Understanding Internet Addressing When connecting to the Internet, you are assigned a unique Public IPv4 or IPv6 address, such as 96.34.118.114 or 2000:b6aa:183f:fdc6:db8:7654:aed7:816c respectively. Testing the validity of these addresses can be done at https://test-ipv6.com/. However, explaining or communicating these addresses to individuals with limited technical knowledge can be error-prone and quickly becomes complex. Understanding Internet Addressing When connecting to the Internet, you are assigned a unique Public IPv4 or IPv6 address, such as 96.34.118.114 or 2000:b6aa:183f:fdc6:db8:7654:aed7:816c respectively. Testing the validity of these addresses can be done at https://test-ipv6.com/. However, explaining or communicating these addresses to individuals with limited technical knowledge can be error-prone and quickly becomes complex.

Understanding Internet Addressing

When connecting to the Internet, you are assigned a unique Public IPv4 or IPv6 address, such as 96.34.118.114 or 2000:b6aa:183f:fdc6:db8:7654:aed7:816c respectively. Testing the validity of these addresses can be done at https://test-ipv6.com/. However, explaining or communicating these addresses to individuals with limited technical knowledge can be error-prone and quickly becomes complex. Furthermore, historical data about previous issues is not provided.

Accessing a website, like https://anderson.net, involves an initial request to a DNS server to translate the host component (anderson) combined with the Top Level Domain (net) of the URL into an IP address, such as 108.114.196.73. Upon making web requests, your computer and browser also include information about their type, for example:
Opera/9.80 (X11; Linux i686; Ubuntu/14.10) Presto/2.12.388 Version/12.16

Significance of Default Gateways

The default gateway, typically assigned automatically through DHCP, is the address to which your computer forwards all its traffic for routing purposes. This default gateway usually ends in .1 or .254, depending on the scale of the network, and is commonly represented as 172.19.59.84. For a detailed analysis of IPv6 connectivity troubleshooting, refer to how-to-fix-ipv6-connectivity/. To check this information on Mac or Linux systems, use:

IPv4 Routes and the Host IPv4 Route Table (inc. VPN)

netstat -rn -f inet | egrep -i "default|0/1|128.0/1"

0/1      172.18.12.193  UGScg  utun3
default  172.19.59.84    UGScg  en0
128.0/1  172.18.12.193  UGSc   utun3

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.

default   fe80:5f8b:df60:9120:f1f8%en0  UGcg   en0
default   fe80::%utun0                   UGcIg  utun0
default   fe80::%utun1                   UGcIg  utun1
default   fe80::%utun2                   UGcIg  utun2
2000::/3  utun3                          USc    utun3

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

Debugging DHCP for both IPv4 and IPv6

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

ipconfig getpacket en0

...
domain_name_server (ip_mult): {142.244.176.143, 87.62.244.240}
end (none):
...

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

ipconfig getv6packet en0

DHCPv6 REPLY (7) Transaction ID 0x80940b Length 76
Options[4] = {
  CLIENTID (1) Length 14: DUID LLT HW 1 Time 668691856 Addr 81:b7:b8:0f:49:6b
  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 a8:4a:66:ad:fe:b5
}

Repair Network Connectivity Issues

When it comes to sending data to your router, you might be using either a wired or wireless (Wi-Fi) medium at the physical and data layer.

Troubleshooting Techniques for Apple macOS / OSX

Regardless of the version of OSX/macOS you have, whether it’s 10.12.7, 11.3.3, or 12.0.8, there are various troubleshooting tools available. However, these manual actions and scripts do not provide a set of correlated values over time. This is where automated remote troubleshooting becomes essential, particularly for teams embracing remote work and Work From Anywhere (WFA).

Effective Built-in Scripts

One useful tool on OSX/macOS is sudo wdutil info, which provides a dump of current wireless settings to the CLI and can be configured to generate specific troubleshooting logs. Additionally, the sysdiagnose tool can be used to generate a wide range of logs, although the information related to wireless is mostly point-in-time similar to wdutil.

To run it in the background and generate logs in /var/tmp/<blah>.tar.gz, use sudo nohup /usr/bin/sysdiagnose -u &. If you prefer to run it interactively, use sudo /usr/bin/sysdiagnose, but keep in mind that the file sizes are around 300MB.



Possibly Helpful Videos

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Table 1.0 - Video Help



P.S. PanSift Tip For Work From Anywhere Support

Digital work requires reliable connectivity for voice, video, and data. Inevitable Wi-Fi, network, and system issues cause teams to lose time and productivity, or worse, to miss out on opportunities. Whether working from home, a shared space, or an office, and irrespective of the network being managed or unmanaged, forward thinking technical teams embrace smarter tools to save their users and clients time and money! See how PanSift provides instant remote troubleshooting, irrespective of location 🏠🏝🛰.

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