No default realm defined for Kerberos

When you connect to some old cisco routers using iterm2 on an OS X, it might takes some time before it prompts for a username. And it might also promt you with this message.

Kerberos: No default realm defined for Kerberos! 

To disable this message you need to create or edit the file .telnetrc in your home directory and add default unset autologin

$ vim ~/.telnetrc
  default unset autologin

esc : wq

Telnet Removed in Mac OS High Sierra 10.13

Found out that telnet as been removed in Mac OS High Sierra 10.13 when I upgraded last night, which is bad for me as i work in networking and some legacy equipment still only has telnet. You can enable it with Homebrew. First, update or install Xcode from the App Store.

brew tap theeternalsw0rd/telnet
brew install telnet 

If Homebrew is not installed, it's available here >> brew.sh

Another option is to copy it from a backup, or other machine, if you have one into /usr/local/bin/

--cheers