MyComputingArt

3Com OfficeConnect ADSL Wireless 54 Mbps 11g Firewall Router

This 3Com product has many functions: router, firewall, adsl modem, wireless access point, 4 port switch. 3Com chose to give two names to its products: a name for the market (as the long name in the title), which identifies the purpose of the product and is not changed when a new model replaces the older one, and a model name, a number which identifies the specific model.
The "ADSL" term in the name is particularly useful to specify that it's a adsl modem too, with a RJ-11 port that would connect the router directly to the phone line, through a RJ-11 cable, just like any adsl modem; in fact I found several routers that were capable of routing the adsl signal but were equipped with a RJ-45 port instead of a RJ-11 port: they were not DSL modems and needed to be connected to an external DSL modem. Checking the rear of the product, maybe on the user guide, can help making sure the router is a DSL modem too.
I will review two 3Com OfficeConnect ADSL Wireless 54 Mbps 11g Firewall Router models, the older 3CRWDR100A-72 and the newer 3CRWDR101A-75.

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Posted by: z24 | Sun, Sep 22 2013 | Category: /hardware | Permanent link | home
Tagged as: dsl, firewall, hardware, password, router, wireless

How to associate username and SID

To know which is the username associated with a known SID (Security Identifier), open the registry (regedit.exe) at this location: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList.

Registry editor with SID keys (62k)

Each SID key has a ProfileImagePath string whose value is the user path which contains the username.
To know which is the SID associated with a known username, select the ProfileList key and search the username.

There is also a SysInternals command-line utility which shows the SID associated with a known username:

C:\>psgetsid Z24

PsGetSid v1.43 - Translates SIDs to names and vice versa
Copyright (C) 1999-2006 Mark Russinovich
Sysinternals - www.sysinternals.com

SID for WAM2\Z24:
S-1-5-21-1993962763-2139871995-725345543-1003

or the username associated with a known SID:

C:\>psgetsid S-1-5-21-1993962763-2139871995-725345543-1003

PsGetSid v1.43 - Translates SIDs to names and vice versa
Copyright (C) 1999-2006 Mark Russinovich
Sysinternals - www.sysinternals.com

Account for WAM2\S-1-5-21-1993962763-2139871995-725345543-1003:
User: WAM2\Z24

Posted by: Z24 | Wed, May 04 2011 | Category: /windows | Permanent link | home
Tagged as: command-line, howto, windows, xp

Launching control panel dialogs from command line

It is possible to directly open the control panel configuration dialogs writing commands in the Run dialog or in a dos prompt window:

control command in Run dialog (10k)
control admintools: open Administrative Tools
control date/time: open the Date and Time properties
control desktop: open the Display properties
control color: open the Display properties and go to Appearance tab
control folders: open Folder Options
control fonts: open the Fonts properties
control infrared: open the Infrared properties
control keyboard: open the Keyboard properties
control mouse: open the Mouse properties
control netconnections: open Network Connections
control telephony: open Phone and Modem Options
control printers: open the Printers properties
control international: open the Regional Settings
control schedtasks: open the Scheduled tasks
control userpasswords: open the User Accounts properties
control userpasswords2: open the Advanced User Accounts properties
control: open the control panel

If the "Safely Remove Hardware" icon disappears, the control command can help:
control hotplug.dll: open the "Safely Remove Hardware" window

Every *.cpl file in the Windows directory can be opened with the control cplfile command:
control vp7dec_settings.cpl: open the On2 VP7 Decompressor Settings, if VP7 codec is installed.

Moreover, some cpl files accept two arguments:
control cplfile[,[@first][,second]]: the first argument indicates the function (if a cpl file controls multiple functions), the second argument indicates the tab of the window to display.
control main.cpl,@0,2: show the 3rd tab of the mouse properties (main.cpl controls mouse and keyboard, @0 is for mouse properties, 2 is the 3rd tab)
control main.cpl,@1,0: show the 1st tab of the keyboard properties (@1 is for kbd properties, 0 is the 1st tab)

Posted by: Z24 | Wed, May 04 2011 | Category: /windows | Permanent link | home
Tagged as: command-line, windows, xp

How to mount an image file and access image content

To get access to the content of a virtual machine image or a ISO file, follow these steps:

associate the file with a loop device node:
# losetup /dev/loop0 /var/otheros.img

list the partition table of the device:

# fdisk -l /dev/loop0 
Disk /dev/loop0: 21.4 GB, 21474837504 bytes 
255 heads, 63 sectors/track, 2610 cylinders 
Units = cylinders of 16065 * 512 = 8225280 bytes 
      Device Boot      Start         End      Blocks   Id  System 
/dev/loop0p1   *           1        2609    20956761    7  HPFS/NTFS

create device map (kpartx is part of multipath-tools package on Ubuntu):

# kpartx -a /dev/loop0
# ls -l /dev/mapper/ 
total 0 
crw-rw---- 1 root root  10, 62 Jul  6  2008 control
brw-rw---- 1 root disk 253,  0 Jul  5 23:18 loop0p1

mount the device partition:
# mount /dev/mapper/loop0p1 /mnt

Posted by: Z24 | Wed, May 04 2011 | Category: /linux | Permanent link | home
Tagged as: command-line, linux, shell

Pausing a command

How to pause / suspend / sleep a running command in a terminal?
Press Ctrl+S
How to resume the paused command?
Press Ctrl+Q

Posted by: Z24 | Wed, May 04 2011 | Category: /linux | Permanent link | home
Tagged as: command-line, linux, shell

How to rename multiple files from bash

Rename all *html files to *test:

for x in `ls *html`; do mv $x `echo $x | sed -e "s/html/test/"`; done

Bash for:

for var in some-list ; do command ; done

Posted by: Z24 | Wed, May 04 2011 | Category: /linux | Permanent link | home
Tagged as: command-line, linux, programming, script, shell

Execute a command at shutdown

To dismount TrueCrypt volumes at shutdown and reboot time, I created a script, put it in/etc/init.d/ and symlinked it into the needed /etc/rc?.d/ directories using update-rc.d.
Here is the detail:

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Posted by: Z24 | Wed, May 04 2011 | Category: /linux | Permanent link | home
Tagged as: command-line, linux, programming, script, shell