Install Citrix Client or Receiver into Linux Ubuntu

Installing the Citrix client or receiver as it’s known for Linux is not as straight forward as it should be, however these two resources below will get you going.

http://ubuntuforums.org/archive/index.php/t-1105855.html
http://geekpete.com/blog/tech-guides/linux-citrix-client-error-61-ubuntu-810-intrepid-ibex

The w32tm service

The w32tm service is actually NTPv3 compliant so if you really want the detail on how it works you can read the RFC http://tools.ietf.org/html/rfc1305. I would set the PDC emulator to sync from the ntp pool (www.pool.ntp.org). That would give your network the most reasonably reliable time (w32tm is only accurate to about a second) and the rest of your domain will follow.

Run this and you should be good on your PDC emulator:

w32tm /configure /manualpeerlist:,0x1 /syncfromflags:manual /update
net stop w32time
net start w32time
w32tm /resync /rediscover

Bad external time source stops Active Directory replication

I had a problem in a test lab with two VM hosts machines with incorrect date/time settings on one server. The main problem was two domain controllers in the AD Domain were split over these two VM hosts so one started up with a major date/time difference which caused a this very painful issue. I would of hated for this to happen in a production environment.

It took me a good 4-5 hours to get this resolved and the best explanation and help to resolve the issue was found here:
http://searchwindowsserver.techtarget.com/tip/0,289483,sid68_gci1299217,00.html

rsnapshot – Linux Snapshot file backup snapshot utility

rsnapshot is a filesystem snapshot utility for making backups of local and remote systems.

Using rsync and hard links, it is possible to keep multiple, full backups instantly available. The disk space required is just a little more than the space of one full backup, plus incrementals.

Depending on your configuration, it is quite possible to set up in just a few minutes. Files can be restored by the users who own them, without the root user getting involved.

There are no tapes to change, so once it’s set up, your backups can happen automatically untouched by human hands. And because rsnapshot only keeps a fixed (but configurable) number of snapshots, the amount of disk space used will not continuously grow.

Download and more info at:
http://rsnapshot.org

Excellent tutorials from The Geek Stuff:
http://www.thegeekstuff.com/2009/08/tutorial-backup-linux-using-rsnapshot-rsync-utility
http://www.thegeekstuff.com/2009/09/linux-remote-backup-using-rsnapshot-rsync-utility

IPTraf for Linux

Just discovered this great utility for Linux IP Traf which is a console based network stats utility. It’s like TCP Track with more features such as filtering traffic types, source and many more options.

Details from IP Traf Site:
IPTraf is a console-based network statistics utility for Linux. It gathers a variety of figures such as TCP connection packet and byte counts, interface statistics and activity indicators, TCP/UDP traffic breakdowns, and LAN station packet and byte counts.

Features

  • An IP traffic monitor that shows information on the IP traffic passing over your network. Includes TCP flag information, packet and byte counts, ICMP details, OSPF packet types.
  • General and detailed interface statistics showing IP, TCP, UDP, ICMP, non-IP and other IP packet counts, IP checksum errors, interface activity, packet size counts.
  • A TCP and UDP service monitor showing counts of incoming and outgoing packets for common TCP and UDP application ports
  • A LAN statistics module that discovers active hosts and shows statistics showing the data activity on them
  • TCP, UDP, and other protocol display filters, allowing you to view only traffic you’re interested in.
  • Logging
  • Supports Ethernet, FDDI, ISDN, SLIP, PPP, and loopback interface types.
  • Utilizes the built-in raw socket interface of the Linux kernel, allowing it to be used over a wide range of supported network cards.

IP Traf is available via your package manager for most Linux distros and the website is:
http://iptraf.seul.org