SPF (Server Policy Framework) is a simple means to limit the ability of others to forge your identity in email. I first implemented it after a forged identity under my domain was used to send Spam. Once SPF was configured, the bounce messages quickly dropped off. Although not as frequently implemented as sender address checks, […]
Back up Windows PCs and Laptops using BackuPC. Includes installing rsycnd on Windows.
Set up a BackupPC Server on Ubuntu. Includes configuration of Linux and OpenWrt clients using rsyncd.
Configuring a common login for Dovecot IMAP(s) and Exim SMTP. Also Exim Submission port and TLS (SSL) configuration.
Replacing 6to4 tunnel with 6in4. IPv6 enabling Bind, Exim, SPF, Squid, and updating Databases containing IP addresses.
Spam blocking techniques for Exim. Uses delays to cause Spambots to fail. Notes on bulk and automated mail servers.
SysteMajik’s policy for incoming and outgoing e-mail. How we allow external users authenticated access to send e-mail.
Over the holidays, I had a user experience and attempted browser hijacking. It appeared to have bypassed my squid proxy. My updated configuration now sends all web access via squid. The old firewall rules, that allowed direct access to the Internet, have been replaced with a transparent Squid proxy. This runs on my existing Squid […]
As the IPv4 addresses begins to run out I finally invested the time to investigate and implement IPV6. As my ISP has not yet announced availability of IPV6 addresses I chose to implement a 6to4 tunnel. This is simple to implement, and currently well supported. My external firewall is an ASUS wireless router running OpenWRT. […]
I found the networking configured by libvirt (KVM) did not allow me to firewall the network as I desired. I use Shorewall for firewalling, and DNSMasq for internal DNS and DHCP. After a little experimentation, I found that I could configure Ubuntu to create the network. This allows me to get a reliable firewall configuration […]