Seriously I don’t like to upgrade or update system if it work very well. But, if the system is already obsolete, I have no choice. Before this I’m using MacOS HighSierra, and Telnet is already there. So I don’t have any problem when I want to use it. But when I upgrade my laptop to MacOS Monterey which one it is the latest OS at this time. I have issues when want to use Telnet. Telnet need to be install manually.

KakiGodek:~ afh$ telnet 10.202.250.2
-bash: telnet: command not found
KakiGodek:~ afh$ 

Telnet Installation.

Before you can start install, open your terminal and copy the command below and paste on your terminal.

curl -O https://raw.githubusercontent.com/Homebrew/install/master/install.sh

After execute the code, you will get information like below.

KakiGodek:~ afh$ curl -O https://raw.githubusercontent.com/Homebrew/install/master/install.sh
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 29071  100 29071    0     0  55967      0 --:--:-- --:--:-- --:--:-- 56779

Then, follow the command below. Press enter and wait until it finish.

sudo chmod +x install.sh
./install.sh
...
...
Press RETURN to continue or any other key to abort:
HEAD is now at 3ddcaacfd Merge pull request #12947 from Bo98/unzip-path
==> Tapping homebrew/core
remote: Enumerating objects: 1150912, done.
remote: Total 1150912 (delta 0), reused 0 (delta 0), pack-reused 1150912
Receiving objects: 100% (1150912/1150912), 456.58 MiB | 1.66 MiB/s, done.
Resolving deltas: 100% (795356/795356), done.
From https://github.com/Homebrew/homebrew-core
 * [new branch]              master     -> origin/master
Updating files: 100% (6300/6300), done.
HEAD is now at 229085efeb0 postgresql@10: update 10.20_1 bottle.
==> Installation successful!

==> Homebrew has enabled anonymous aggregate formulae and cask analytics.
Read the analytics documentation (and how to opt-out) here:
  https://docs.brew.sh/Analytics
No analytics data has been sent yet (nor will any be during this install run).

==> Homebrew is run entirely by unpaid volunteers. Please consider donating:
  https://github.com/Homebrew/brew#donations

==> Next steps:
- Run brew help to get started
- Further documentation:
    https://docs.brew.sh

KakiGodek:~ afh$ 

Then, type the command below. After it finish, you can test the telnet.

KakiGodek:~ afh$ brew install telnet
==> Downloading https://ghcr.io/v2/homebrew/core/telnet/manifests/63
######################################################################## 100.0%
...
...
...
==> Pouring telnet--63.monterey.bottle.tar.gz
🍺  /usr/local/Cellar/telnet/63: 4 files, 174.9KB
==> Running `brew cleanup telnet`...
Disable this behaviour by setting HOMEBREW_NO_INSTALL_CLEANUP.
Hide these hints with HOMEBREW_NO_ENV_HINTS (see `man brew`).
KakiGodek:~ afh$ telnet 10.202.250.2
Trying 10.202.250.2...
Connected to 10.202.250.2.
Escape character is '^]'.


User Access Verification

Username: admin
Password: 

C2960X4-Stagging#
C2960X4-Stagging#exit
Connection closed by foreign host.