mndp: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/mndp - from package: mactelnet-client

You may install the required package with command apt-get install {package}

Error in other languages:
mndp: bevel nie gevind nie
mndp: comandă negăsită
mndp: comando não encontrado
mndp: commande introuvable
mndp: command not found
mndp: käsku ei ole
mndp: không tìm thấy lệnh
mndp: komanda nerasta
mndp: Kommando nicht gefunden.
mndp: kommandot finns inte
mndp: komut yok
mndp: nie znaleziono polecenia
mndp: níor aimsíodh an t-ordú
mndp: no se encontró la orden
mndp: no s'ha trobat l'ordre
mndp: opdracht niet gevonden
mndp: parancs nem található
mndp: perintah tidak ditemukan
mndp: príkaz nenájdený
mndp: příkaz nenalezen
mndp: команда не найдена
mndp: командата не е открита
mndp: 命令找不到
mndp: コマンドが見つかりません