sctp_test: 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 CentOS possible default full paths are:

/usr/bin/sctp_test - from package: lksctp-tools

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/sctp_test - from package: lksctp-tools

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

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