The sbd command is a netcat clone that offers decent encryption, allows for command execution, and will install on Linux or Windows. You are likely aware of netcat and all of the different ways you can use it including reverse shells, port scanning, etc. The sbd command is a great tool for opening up protected listeners or as noted in the Backtrack Linux menu for maintaining access to servers on compromised networks. Since it is likely you are familiar with nc or netcat below I go into setting up a reverse shell using a secret key between the listener and the connecting client.
If you are not hip to pfSense I suggest you check it out. It is an open source firewall that is making waves in InfoSec. The pfSense guys have a great howto for configuring IPSec VPN on the pfSense firewall as well as making connections via a freeware Windows IPSec VPN client called Shrew Soft which can be read by clicking here. The only item lacking in the article is a recommendation for a Mac OSX client as well as configuration tips for a Mac OSX client which is the sole point of this article. Below is information about where to download a freeware Mac OSX IPSec VPN client and then the necessary configuration to make a connection to the suggested settings noted in the howto of the pfSense web site.
I have been slowly getting everything installed on my new laptop I recently purchased that has Windows 7 Ultimate 64-Bit on it. One of the applications I figured would work without issue was the Trillian OTR(Off-The-Record Messaging) plugin which allows encrypted communication over ICQ, AIM, MSN, Yahoo!, Jabber, Rendezvous, and Sametime instant messaging clients. Trillian actually has a built in encryption system called SecureIM however Trillian OTR goes way beyond the security provided the built in encryption provided by SecureIM.
I have configured a Linksys WRT600N to connect using PPTP to my company’s VPN server in the past as noted in this previous article. I have since swapped out the Linksys WRT600N with a Linksys WRT54GS because I wanted to replace the antennas with larger antennas to work on getting better wireless coverage in my workshop in the basement and with the primary wireless router being located on the second floor of my house I needed to do numerous things to squeeze as much signal as possible. I also noticed numerous other issues with the WRT600N including the router locking up on a regular basis as well as dropping connections.
During initial installation of a subversion repository server you may run into issues with authentication methods. This issue is probably related to not having a package installed that needs to be for your authentication to function properly.
Error Received in TortoiseSVN: Could not obtain a list of SASL mechanisms