UDP problem…

Wednesday, January 24th, 2007

I found a peculiar problem while I was setting up an openvpn link the other day. The goal was a simple shared key setup and I started with the sample configuration and modified it a bit to fit the circumstances, I allowed the correct UDP port through the firewall (I think 1194 if I recall [...]

The great firewall of China

Thursday, June 29th, 2006

The great firewall of China may be just an illusion in technical terms. This article describes the details of how things work…. Basically when “banned content” is detected, both ends of the connection are sent a flood of tcp reset packets. Which (if both sides are designed to pay attention to) means that the two [...]

Ping not working? try ARP

Monday, December 26th, 2005

I’ll confess to having a lot to learn about IP ethernet networking. I feel pretty comfortable with basic TCP/IP (v4), the concept of UDP vs. TCP ports, ICMP pings, etc… but ARP is something that I haven’t dabbled much with. It is, of course, a layer that TCP depends on. When a machine sends a [...]

Esbot and Zotob updates….

Wednesday, August 17th, 2005

Wednesday afternoon and Esbot is up to revision .B, Zotob is up to G according to Sarc (Symantec antivirus research). They have appropriate removal tools and details on affected systems there. Meanwhile the Sans institute (incidents.org) has a rundown of the latest in todays handlers diary.    Send article as PDF   

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