Category Archives: internet

the dark

My home network is not so afraid of the dark… I have no guarantee of absolute protection from zero-day threats, but no one does. We can only do our best to keep up with current anti-virus and firewall rules, but … Continue reading

Posted in consulting, internet, Linux, network | Tagged , , , , , , , , | Leave a comment

Even old servers deserve our help.

You too may have spent some time recently, responding to the Shellshock threat. Most (many ?) sites had a pretty good grip and were able to apply available patches easily and reduce their visibility quickly. I thought of one client … Continue reading

Posted in consulting, internet, Linux | Tagged , , , , , | 1 Comment

PIM BiDir Bidirectional Wireshark dissectors

Bidirectional Protocol Independent Multicast RFC 5015 ( ) is in my opinion the most bulletproof multicast routing protocol around, but it doesn’t have a huge install base.  Consequently, the PIM dissector in even the latest wireshark as of this … Continue reading

Posted in internet, network | 4 Comments

I’ve been workin . . .

I scribbled this out some time back, in the mid-90s as I was pulling arrows out of my backside – learning how to manage an internet service. I only recently found where I had later saved it in a text … Continue reading

Posted in control, internet, network | Tagged , , , , , | Leave a comment

Multicast to Unicast and Vice Versa

Conversion from multicast to unicast, unicast to multicast and between multicast group addresses using a Cisco router Continue reading

Posted in anything, internet, network, Uncategorized | Tagged , , , , , , | Leave a comment

Favorite WordPress links

I like the WordPress environment for use as a CMS, but it has much more capability than I’ll ever remember. After running WordPress on my server for a few years, I decided to move my blogs to, and use … Continue reading

Posted in internet, wordpress | Tagged , , , , , | Leave a comment

sendmail delivery to alternate port

Slightly dated, but still a very useful sendmail hack. My cable modem provider blocks not only outbound port 25 to anyone other than their own mail server, but they block inbound port 25 (as tho I am not responsible enough … Continue reading

Posted in internet, Linux, network | Tagged , , , , , | 1 Comment