Debian iptables Linux

kernel: conntrack: generic helper won’t handle protocol 47.

I was getting the following message in my log files on my Debian firewall. kernel: conntrack: generic helper won’t handle protocol 47. Please consider loading the specific helper module. The nf_conntrack_proto_gre module needs to be loaded to resolve this. modprobe nf_conntrack_proto_gre To load it automatically at boot, I created a new file (gre.conf) in /etc/modules-load.d […]

Bind9 Debian Linux opendkim Postfix

OpenDKIM on Debian 9.4 (stretch)

I spent a lot of time trying to get OpenDKIM to work on Debian Stretch. Having searched the Internet thoroughly, once again I found many different configurations, none of which actually worked for me. These are my various config files, with the domain name(s) swapped for “example.com” and the ‘selectors’ swapped for “example-selector-name” If you […]