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

Panorado Flyer

Panorado Flyer
License: freeware for private use
Author: Karl Maloszek
Install: yes
Size: 250 KBytes (114 KBytes installer)
Requirement: Windows with COM support

Panorado Flyer is a compact program that gathers GPS coordinates from Google Earth and writes them into images EXIF information.

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Posted by: Z24 | Wed, May 04 2011 | Category: /software/windows | Permanent link | home
Tagged as: freeware, google earth, gps, images, software, tools, windows

GPG key error updating aptitude, Debian upgrade

I had an old Debian Etch machine which I did not upgrade for some time, and when I attempted to install ghostscript by using Synaptic, I've got some unmet dependencies errors with libc6 and libc6-dev. Any attempt to reinstall or upgrade these packages failed, so I decided to try to upgrade the whole system to Lenny:

I replaced etch with lenny in /etc/apt/sources.list
#sudo aptitude update
But I've got this error:
"There is no public key available for the following key IDs: xxxxxxxxxxxxxxxx"
The error can be solved downloading the GPG signatures with these commands:
#gpg --keyserver keyserver.ubuntu.com --recv xxxxxxxxxxxxxxxx #gpg --export --armor xxxxxxxxxxxxxxxx | apt-key add -
I've tried a few servers (subkeys.pgp.net, keyserver.pgp.com, wwwkeys.eu.pgp.net) but they could not find the "right" keys...
Then I did the #sudo aptitude update again.
#sudo aptitude install apt dpkg aptitude
#sudo aptitude full-upgrade

And then I've been able to install ghostscript.

Posted by: Z24 | Wed, May 04 2011 | Category: /linux | Permanent link | home
Tagged as: gpg, linux

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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