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style: Enable vscode spellcheck and fix typos/style (#2888)

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Signed-off-by: fria <138676274+friadev@users.noreply.github.com>
Signed-off-by: Daniel Gray <dngray@privacyguides.org>
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Jonah Aragon
2025-02-13 13:12:32 -06:00
parent c11661c0be
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18
docs/advanced/dns-overview.md
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@@ -4,7 +4,7 @@ icon: material/dns
description: The Domain Name System is the "phonebook of the internet," helping your browser find the website it's looking for.
---
The [Domain Name System](https://en.wikipedia.org/wiki/Domain_Name_System) is the 'phonebook of the Internet'. DNS translates domain names to IP addresses so browsers and other services can load Internet resources, through a decentralized network of servers.
The [Domain Name System](https://en.wikipedia.org/wiki/Domain_Name_System) is the 'phone book of the Internet'. DNS translates domain names to IP addresses so browsers and other services can load Internet resources, through a decentralized network of servers.
## What is DNS?
@@ -24,7 +24,7 @@ Below, we discuss and provide a tutorial to prove what an outside observer may s
tshark -w /tmp/dns.pcap udp port 53 and host 1.1.1.1 or host 8.8.8.8
```
2. We can then use [`dig`](https://en.wikipedia.org/wiki/Dig_(command)) (Linux, MacOS, etc.) or [`nslookup`](https://en.wikipedia.org/wiki/Nslookup) (Windows) to send the DNS lookup to both servers. Software such as web browsers do these lookups automatically, unless they are configured to use encrypted DNS.
2. We can then use [`dig`](https://en.wikipedia.org/wiki/Dig_(command)) (Linux, macOS, etc.) or [`nslookup`](https://en.wikipedia.org/wiki/Nslookup) (Windows) to send the DNS lookup to both servers. Software such as web browsers do these lookups automatically, unless they are configured to use encrypted DNS.
=== "Linux, macOS"
@@ -39,7 +39,7 @@ Below, we discuss and provide a tutorial to prove what an outside observer may s
nslookup privacyguides.org 8.8.8.8
```
3. Next, we want to [analyse](https://wireshark.org/docs/wsug_html_chunked/ChapterIntroduction.html#ChIntroWhatIs) the results:
3. Next, we want to [analyze](https://wireshark.org/docs/wsug_html_chunked/ChapterIntroduction.html#ChIntroWhatIs) the results:
=== "Wireshark"
@@ -70,7 +70,7 @@ Encrypted DNS can refer to one of a number of protocols, the most common ones be
### DNSCrypt
[**DNSCrypt**](https://en.wikipedia.org/wiki/DNSCrypt) was one of the first methods of encrypting DNS queries. DNSCrypt operates on port 443 and works with both the TCP or UDP transport protocols. DNSCrypt has never been submitted to the [Internet Engineering Task Force (IETF)](https://en.wikipedia.org/wiki/Internet_Engineering_Task_Force) nor has it gone through the [Request for Comments (RFC)](https://en.wikipedia.org/wiki/Request_for_Comments) process, so it has not been used widely outside of a few [implementations](https://dnscrypt.info/implementations). As a result, it has been largely replaced by the more popular [DNS over HTTPS](#dns-over-https-doh).
[**DNSCrypt**](https://en.wikipedia.org/wiki/DNSCrypt) was one of the first methods of encrypting DNS queries. DNSCrypt operates on port 443 and works with both the TCP or UDP transport protocols. DNSCrypt has never been submitted to the [Internet Engineering Task Force (IETF)](https://en.wikipedia.org/wiki/Internet_Engineering_Task_Force) nor has it gone through the [Request for Comments (RFC)](https://en.wikipedia.org/wiki/Request_for_Comments) process, so it has not been used widely outside a few [implementations](https://dnscrypt.info/implementations). As a result, it has been largely replaced by the more popular [DNS over HTTPS](#dns-over-https-doh).
### DNS over TLS (DoT)
@@ -118,7 +118,7 @@ In this example we will record what happens when we make a DoH request:
3. After making the request, we can stop the packet capture with <kbd>CTRL</kbd> + <kbd>C</kbd>.
4. Analyse the results in Wireshark:
4. Analyze the results in Wireshark:
```bash
wireshark -r /tmp/dns_doh.pcap
@@ -136,13 +136,13 @@ When we do a DNS lookup, it's generally because we want to access a resource. Be
The simplest way to determine browsing activity might be to look at the IP addresses your devices are accessing. For example, if the observer knows that `privacyguides.org` is at `198.98.54.105`, and your device is requesting data from `198.98.54.105`, there is a good chance you're visiting Privacy Guides.
This method is only useful when the IP address belongs to a server that only hosts few websites. It's also not very useful if the site is hosted on a shared platform (e.g. Github Pages, Cloudflare Pages, Netlify, WordPress, Blogger, etc.). It also isn't very useful if the server is hosted behind a [reverse proxy](https://en.wikipedia.org/wiki/Reverse_proxy), which is very common on the modern Internet.
This method is only useful when the IP address belongs to a server that only hosts few websites. It's also not very useful if the site is hosted on a shared platform (e.g. GitHub Pages, Cloudflare Pages, Netlify, WordPress, Blogger, etc.). It also isn't very useful if the server is hosted behind a [reverse proxy](https://en.wikipedia.org/wiki/Reverse_proxy), which is very common on the modern Internet.
### Server Name Indication (SNI)
Server Name Indication is typically used when a IP address hosts many websites. This could be a service like Cloudflare, or some other [Denial-of-service attack](https://en.wikipedia.org/wiki/Denial-of-service_attack) protection.
Server Name Indication is typically used when an IP address hosts many websites. This could be a service like Cloudflare, or some other [Denial-of-service attack](https://en.wikipedia.org/wiki/Denial-of-service_attack) protection.
1. Start capturing again with `tshark`. We've added a filter with our IP address so you don't capture many packets:
1. Start capturing again with `tshark`. We've added a filter with our IP address, so you don't capture many packets:
```bash
tshark -w /tmp/pg.pcap port 443 and host 198.98.54.105
@@ -294,7 +294,7 @@ graph TB
ispDNS --> | No | nothing(Do nothing)
```
Encrypted DNS with a third-party should only be used to get around redirects and basic [DNS blocking](https://en.wikipedia.org/wiki/DNS_blocking) when you can be sure there won't be any consequences or you're interested in a provider that does some rudimentary filtering.
Encrypted DNS with a third party should only be used to get around redirects and basic [DNS blocking](https://en.wikipedia.org/wiki/DNS_blocking) when you can be sure there won't be any consequences, or you're interested in a provider that does some rudimentary filtering.
[List of recommended DNS servers](../dns.md){ .md-button }