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Conclusion
With this, we have traversed through the TCP/IP stack completely. We hope there will be a different perspective when one opens any website in the browser post the course.
During the course we have also dissected what are common tasks in this pipeline which falls under the ambit of SRE.
Post Training Exercises
- Set up your own DNS resolver in the
devenvironment which acts as an authoritative DNS server forexample.comand forwarder for other domains. Updateresolv.confto use the new DNS resolver running inlocalhost. - Set up a site
dummy.example.cominlocalhostand run a webserver with a self-signed certificate. Update the trusted CAs or pass self-signed CA’s public key as a parameter so thatcurl https://dummy.example.com -vworks properly without self-signed cert warning. - Update the routing table to use another host (container/VM) in the same network as a gateway for
8.8.8.8/32and runping 8.8.8.8. Do the packet capture on the new gateway to see L3 hop is working as expected (might need to disableicmp_redirect).