How Can I Test OSX Connectivity

Understanding Internet Protocol Addressing When using the Internet, individuals typically have either a Public IPv4 or IPv6 address. You can verify this by visiting https://test-ipv6.com/. However, communicating these addresses, such as MAC addresses, can be challenging for those not well-versed in technology. Understanding Internet Protocol Addressing When using the Internet, individuals typically have either a Public IPv4 or IPv6 address. You can verify this by visiting https://test-ipv6.com/. However, communicating these addresses, such as MAC addresses, can be challenging for those not well-versed in technology.

Understanding Internet Protocol Addressing

When using the Internet, individuals typically have either a Public IPv4 or IPv6 address. You can verify this by visiting https://test-ipv6.com/. However, communicating these addresses, such as MAC addresses, can be challenging for those not well-versed in technology. Furthermore, this method does not provide any historical data, particularly when addressing past issues.

Accessing a website like https://denesik.net involves first contacting a DNS server to convert the URL’s host and Top Level Domain to an IP address, such as 64.189.80.178. Every web request from your computer and browser includes its type, such as
Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; AS; rv:11.0) like Gecko

Understanding the Significance of Default Gateways

The default gateway is typically assigned automatically through DHCP and usually ends in .1 or .254. This is where all of your computer’s traffic is sent for further routing. For IPv6, more information is available in our in-depth article on how-to-fix-ipv6-connectivity/, or you can check on Mac or Linux using:

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  192.0.0.177    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   fe80:452a:73b2:25c4:2d4e%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): {152.63.236.152, 149.66.124.187}
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 3e:c0:7a:6e:8f:50
  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 fd:14:3c:ba:69:0a
}

Resolving Connectivity Issues in Wired or Wireless Networks

When it comes to transmitting data to your router, you may be using a wired connection or a wireless (Wi-Fi) network at the physical and data layer.

Tips and Tricks for Apple macOS / OSX Users

Regardless of whether you are using OSX or macOS versions such as 10.12.6, 11.1.4, or 12.2.5, there are various tools available for troubleshooting connectivity issues. However, these manual actions and scripts do not provide a consistent set of correlated values over time. This is where automated remote troubleshooting becomes valuable, especially for teams that are engaged in remote work and Work From Anywhere (WFA).

Useful Built-in Utilities

One of the most useful tools on OSX/macOS is the sudo wdutil info command, which provides a dump of current wireless settings in the CLI and can also be configured to generate specific logs for troubleshooting purposes. Another comprehensive tool is the sysdiagnose utility, which can be used to generate a wide range of logs, although most of the information related to wireless is only relevant at a specific point in time, similar to wdutil.

Running sudo nohup /usr/bin/sysdiagnose -u & in the background will generate logs in /var/tmp/<blah>.tar.gz. If you prefer to run it interactively, you can use sudo /usr/bin/sysdiagnose, which will display 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.

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P.S. PanSift Tip For Work From Anywhere Support

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