wirefilter: 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/wirefilter - from package: vde2

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

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