ipv6logstats: command not found

Have You tried accessing the binary with the full path?

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/ipv6logstats - from package: ipv6calc

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

On Debian possible default full paths are:

/usr/bin/ipv6logstats - from package: ipv6calc

You may install the required package with command apt-get install {package}
Error in other languages:
ipv6logstats: bevel nie gevind nie
ipv6logstats: comandă negăsită
ipv6logstats: comando não encontrado
ipv6logstats: commande introuvable
ipv6logstats: command not found
ipv6logstats: käsku ei ole
ipv6logstats: không tìm thấy lệnh
ipv6logstats: komanda nerasta
ipv6logstats: Kommando nicht gefunden.
ipv6logstats: kommandot finns inte
ipv6logstats: komut yok
ipv6logstats: nie znaleziono polecenia
ipv6logstats: níor aimsíodh an t-ordú
ipv6logstats: no se encontró la orden
ipv6logstats: no s'ha trobat l'ordre
ipv6logstats: opdracht niet gevonden
ipv6logstats: parancs nem található
ipv6logstats: perintah tidak ditemukan
ipv6logstats: príkaz nenájdený
ipv6logstats: příkaz nenalezen
ipv6logstats: команда не найдена
ipv6logstats: командата не е открита
ipv6logstats: 命令找不到
ipv6logstats: コマンドが見つかりません