Sunday, April 22, 2007

Going Green: Utilizing S3 Standby Mode Without Losing Functionality.

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Monday, April 02, 2007

ESX Server Management Interface reports “Unexpected Response” errors





Phil’s NewsPhlash » 2004 » December

I am posting this because I had it happen too many times and have found it very hard to find this information on the VMWare support site. The links that I saved would either become invalid or would not point to the same thing any more.

This came from the VMWare site so if you have doubts about it, please go there and check it out.

Question
When attempting to manage an ESX Server 2.x virtual machine, the Management Interface reports one of the following:

Unexpected response from vmware-authd: 511 Error connecting to /usr/sbin/vmware-ccagent process.

Unexpected response from vmware-authd: 511 Error connecting to /usr/sbin/vmware-serverd process.

When this ESX Server host is managed by VirtualCenter, the VirtualCenter client may also hang or fail to manage the virtual machines running on that ESX Server host. Is it possible to get past these problems?

Answer
Below are the steps you should take to restore connectivity to ESX Server virtual machines without restarting ESX Server itself to resolve the problem.

Check the free disk space on the root filesystem (the / directory).
Log into the Service Console.
Run vdf -h.
If the Use% column is at or near 100%, move any non-essential files, such as .iso files, to another location to make more space available.

Restart vmware-ccagent or vmware-serverd.
If this ESX Server host is listed in VirtualCenter, run:
ps -auwwwx |grep vmware-ccagent
If this ESX Server host is not listed in VirtualCenter, run:
ps -auwwwx |grep vmware-serverd
Find the process ID for vmware-ccagent (or vmware-serverd).
Kill the process using kill -9 nnn, where nnn is the process ID noted in the previous step.

Restart the http daemon. Run /etc/init.d/httpd.vmware restart.

One possible cause for these problems is attempting to use the Management Interface and the VirtualCenter client to simultaneously access ESX Server while the server is managed by VirtualCenter.





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Wednesday, March 21, 2007

How to solve Windows system crashes in minutes





How to solve Windows system crashes in minutes - Network World

This primer will show you how to solve problems quickly. Using a tool that costs nothing, you can solve approximately 50%
of Windows server and workstation crashes in a few minutes. The tool is WinDbg , the free Windows debugger.




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Tuesday, March 06, 2007

What two ICMP types should never be blocked?



What two ICMP types should never be blocked?

# Q: What two ICMP types should never be blocked?


# A: ICMP type 3, Destination Unreachable, especially code 4,
"fragmentation needed but don't fragment bit set" (necessary for path MTU
discovery) and ICMP type 11, time exceeded (so you can use traceroute from
inside the network and get replies).




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Thursday, March 01, 2007

Zenworks Imaging

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ZENworks - Preparing Imaging Boot CDs or DVDs

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Multi-level, Colorful and "Jazzy" PXE Boot Menus Made Easy





Cool Solutions: Multi-level, Colorful and "Jazzy" PXE Boot Menus Made Easy

Multi-level, Colorful and "Jazzy" PXE Boot Menus Made Easy




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How to Store a ZENworks Image to a Local USB Hard Drive





Cool Solutions: How to Store a ZENworks Image to a Local USB Hard Drive

How to Store a ZENworks Image to a Local USB Hard Drive




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Automated ZEN Imaging: The Next Step

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Getting ZEN Imaging to work with SYSPREP





Cool Solutions: Getting ZEN Imaging to work with SYSPREP

Getting ZEN Imaging to work with SYSPREP




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Getting a Single Bootable Floppy to work with ZEN Imaging





Cool Solutions: Getting a Single Bootable Floppy to work with ZEN Imaging

Getting a Single Bootable Floppy to work with ZEN Imaging




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Sunday, December 17, 2006

Windows - Auto Patcher & NliteOS

Use AutoPatcher to combine a bunch of patches into a single file.
http://www.autopatcher.com/

Then use NliteOS to automate an installation of XP (or other windows OS).
http://www.nliteos.com/index.html
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Sunday, November 05, 2006

Linux - EasyUbuntu



Welcome to EasyUbuntu
Welcome to EasyUbuntu!

EasyUbuntu is an easy to use (duh!) script that gives the Ubuntu user the most commonly requested apps, codecs, and tweaks that are not found in the base distribution - all with a few clicks of your mouse.


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Cisco - Prioritising ACK Traffic Simply

class-map match-all priack
 match access-group 101
!
!
policy-map prioritize-ack
 class priack
  bandwidth 500

interface Ethernet1
 description WAN
 ip address X.X.X.X 255.255.255.252
 ip nat outside
 service-policy output prioritize-ack
 no cdp enable


access-list 101 permit tcp any any ack

Cisco#sh access-lists 101
Extended IP access list 101
   10 permit tcp any any ack (25521 matches)


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Cisco - How to block Skype traffic

How to block skype June 7, 2006
Posted by ciscotips in security, Router, QOS, Access-lists. trackback

On April 4th 2006, Cisco released IOS version 12.4 (4) T. Cisco introduced
much awaited Skype classification in NBAR . So now with simple policy you
can block skype. Skype can be blocked in a similar way as we use to block
kazza,limewire and other p2p applications.

Example:-

NBAR configuration to drop Skype packets

class?map match?any p2p
match protocol skype

policy?map block?p2p
class p2p
drop

int FastEthernet0
description PIX?facing interface
service?policy input block?p2p

If you are unsure about the bandwidth eating applications being used in
your organisation. you can access the interface connected to the Internet
and configure following command

ip nbar protocol-discovery.

This will enable nbar discovery on your router.

Use following command:-

show ip nbar protocol-discovery stats bit-rate top-n 10

it will show you top 10 bandwidth eating applications being used by the
users. Now you will be able to block/restrict traffic with appropriate QoS
policy.

we can also use ip nbar port-map command to look for the protocol or
protocol name, using a port number or numbers other than the well-known
Internet Assigned Numbers Authority (IANA)-assigned) port numbers.

Usage as per cisco:-
ip nbar port-map protocol-name [tcp | udp] port-number

Up to 16 ports can be specified with this command. Port number values can
range from 0 to 65535Cisc o


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Linux - Backing up a Unix(-like) system



Backing up a Unix(-like) system
Backing up a Unix(-like) system


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Cisco - Configuring TCP Performance Parameters

Tips on improving TCP performance

Cisco IOS IP Application Services Configuration Guide, Release 12.4 - Configuring TCP Performance Parameters  [Cisco IOS Software Releases 12.4 Mainline] - Cisco Systems
The Transmission Control Protocol (TCP) is a protocol that specifies the format of data and acknowledgments used in data transfer. TCP is a connection-oriented protocol because participants must establish a connection before data can be transferred. By performing flow control and error correction, TCP guarantees reliable, in-sequence delivery of packets. It is considered a reliable protocol because if an IP packet is dropped or received out of order, TCP will request the correct packet until it receives it.


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Microsoft Shared Computer Toolkit for Windows XP



Microsoft Shared Computer Toolkit for Windows XP
The Shared Computer Toolkit helps make it easy to set up, safeguard, and manage reliable shared computers running genuine Windows XP.


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Windows XP - NSA Security Guide



Operating Systems Guides
Microsoft Windows XP Guides

NSA has developed and distributed configuration guidance for Microsoft Windows NT and Windows 2000 in the form of configuration guides. These guides are currently being used throughout the government and by numerous entities as a security baseline for their Windows systems.


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Cisco - Block Skype

Block Skype
How to block skype June 7, 2006
Posted by ciscotips in security, Router, QOS, Access-lists. trackback

On April 4th 2006, Cisco released IOS version 12.4 (4) T. Cisco introduced
much awaited Skype classification in NBAR . So now with simple policy you
can block skype. Skype can be blocked in a similar way as we use to block
kazza,limewire and other p2p applications.

Example:-

NBAR configuration to drop Skype packets

class?map match?any p2p
match protocol skype

policy?map block?p2p
class p2p
drop

int FastEthernet0
description PIX?facing interface
service?policy input block?p2p

If you are unsure about the bandwidth eating applications being used in
your organisation. you can access the interface connected to the Internet
and configure following command

ip nbar protocol-discovery.

This will enable nbar discovery on your router.

Use following command:-

show ip nbar protocol-discovery stats bit-rate top-n 10

it will show you top 10 bandwidth eating applications being used by the
users. Now you will be able to block/restrict traffic with appropriate QoS
policy.

we can also use ip nbar port-map command to look for the protocol or
protocol name, using a port number or numbers other than the well-known
Internet Assigned Numbers Authority (IANA)-assigned) port numbers.

Usage as per cisco:-
ip nbar port-map protocol-name [tcp | udp] port-number

Up to 16 ports can be specified with this command. Port number values can
range from 0 to 65535



Operating Systems Guides
Microsoft Windows XP Guides

NSA has developed and distributed configuration guidance for Microsoft Windows NT and Windows 2000 in the form of configuration guides. These guides are currently being used throughout the government and by numerous entities as a security baseline for their Windows systems.


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