iked: 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/sbin/iked - from package: ike

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

On Debian possible default full paths are:

/usr/sbin/iked - from package: ike

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

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