Dynamic DNS

If you host your own domain name server and if you want to securely and dynamically update some DNS entries, here is a small howto.

Here is in a nutshell what we are going to do:

1. Create a secret key to securely update the DNS zone
2. Configure a dynamic (sub) zone in your DNS server
3. Create a script to update a DNS entry

[Read more]

6in4 Tunnel

Thanks to company like Hurricane Electric or SixXS it is very easy to connect to IPv6 Internet backbone even if your ISP does not provide native access to IPv6. Those companies provide free access to their tunnel brokers. A tunnel broker is a dual homed router connected to IPv4 Internet backbone on one side and to IPv6 backbone on the other side. The concept is quite simple, you have access to the IPv4 world and you want to access the IPv6 world. You just need to build a 6in4 tunnel from your DSL router or from your PC or actually from whatever IPv4/IPv6 capable you want to the tunnel broker on the IPv4 side and you’ll encapsulate your IPv6 traffic into that tunnel. The broker will decapsulate your IPv6 packets and send them to the IPv6 Internet backbone. The tunnel broker will also advertise your IPv6 range to the backbone in order to allow the traffic to flow back to your 6in4 tunnel. [Read more]

SNMP on Debian

If you want to monitor your servers from a central management station, you’ll probably need to configure an SNMP daemon on your servers. Here is a quick note to show you how easy it is to get started with SNMP on Linux machine (examples are for Debian but should be easy to adapt for other distribution). [Read more]

Dual stack IPv4/IPv6 on FreeBSD

Here is a quick note to show how easy it is to enable a dual IP stack on FreeBSD (and actually on most modern system)… [Read more]

Dynamic Multipoint VPN – Dual hub

In a previous article, I exposed how to setup a basic DMVPN network with one hub router in a central location and several spoke routers negotiating a dynamically built IPSec protected GRE tunnel. I also explained the central site should be secured by deploying two hub routers… Here is one solution among others using DMVPN and OSPF. (Should you need another solution you can always contact our professional services)
[Read more]

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