Windows: Renew a machine certificate


in most Active Directory Enviroments the Certificate Enrollment is active which generates and enrolls a certificate for each client. This can be used for Radius authentication or as certificate for an IIS webserver.

Typically the client renews this certificate itself.
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DHCP: dhtest a tool to send customized packets to a DHCP Server


dhtest is a tool to generate DHCP packets and send it to a DHCP server.
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Linux: Regenerate sshd host keys


to generate sshd host keys, for example in case of cloning a virtual linux instance, do the following steps:

Checkout the key file names

root@debdevt:~# grep HostKey /etc/ssh/sshd_config
# HostKeys for protocol version 2
HostKey /etc/ssh/ssh_host_rsa_key
HostKey /etc/ssh/ssh_host_dsa_key
HostKey /etc/ssh/ssh_host_ecdsa_key
HostKey /etc/ssh/ssh_host_ed25519_key

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