Devede. One solutions for two different errors

Situation: 

1) When creating a .iso image using Devede and creating  subtitles  in Spanish DeVeDe returns the error: "Failed to write to the destination directory. Check That You have privileges and free space there". 

2) When you create a .iso using Devede and creating subtitles in Spanish Devede returns the error: "conversion failed. It Seems a bug of spumux" 
Solution:
The problem is due to the subtitle file format, it must be a .srt and UTF-8 encoding
That is, the solution is to have the .srt with UTF-8 encoding. To do that you can use Microsoft Word, and follow the following procedure:

a) Open the subtitle file .srt with Microsoft Word
b) File -> Save As -> select Plain Text (. txt)
c) Click on save
d) A new window appears, select the option "Other encoding"
e) Select UTF-8 from the list on the right side.

Done!, re-create the ISO using Devede.

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Disable / shutdown iptables on Linux

Introduction:

Sometimes it is necessary to "shutdown" or disable our Linux iptables, the procedure depends on the Linux distribution you're using.  

1) Procedure if you are using Redhat, Fedora, Mandriva / Mandrake or Centos, you just have to run the following:
# service iptables save
# service iptables stop
# chkconfig iptables off
or
# / etc /init.d/iptables stop


2) How to disable iptables on Debian or Ubuntu

a) Create a script called fw.stop with the following contents:

# /bin/sh
echo "Stopping firewall and Allowing everyone ..."
iptables -F
iptables -X
iptables -t nat -F
iptables -t nat -X
iptables -t mangle -F
iptables -t mangle -X
iptables -P INPUT ACCEPT
iptables -P FORWARD ACCEPT
iptables -P OUTPUT ACCEPT

b) Give execute permission to the script:

# chmod + x / root / fw.stop
or
# chmod 755 fw.stop
c) You can run the scritp with the following command:
# ./fw.stop

More info at:
http://sources68.com/linux-disable-remove-the-iptables-firewall-1fa67761.html

http://blog.acostasite.com/2012/09/deshabilitar-iptables-en-linux.html 

Cisco clear line does not work

Case:
When performing a "clear line" in a Cisco Router/Switch to disconnect a Telnet or SSH session does not work. The user still in the vty.

Example:


IMP# sh user
Line User Host (s) Idle Location
2 vty 0 idle 00:00:01 abcd aacosta
* 4 vty 2 idle 00:00:00 pepe xx.yy.zz.dd

We want to disconnect aacosta:
IMP# clear line vty 2


and still appearing:


IMP# who
Line User Host (s) Idle Location
2 vty 0 idle 00:00:39 abcd aacosta
* 4 vty 2 idle 00:00:00 pepe xx.yy.zz.dd

Procedure and solution:
There are two ways to do it:

a) Quickly and 99% sure it will works (and less likely to damage something else).
Instead of using "clear line vty" use "clear tcp line":

So (again to disconnect pepe):

IMP# clear tcp line 2
[Confirm]
[OK]

b) And the second way more drastically:

We have to search for the TCP connections in the router at that time. We use the command "show tcp brief". We filter port 23 (Telnet) or 22 (SSH) as applicable.  

For example:

IMP# show tcp brief | i \ 23 _

63820270  n.n.n.n.23        a.b.c.d.56691     ESTAB

637E1AC0  x.x.x.x.23             xx.yy.zz.dd.39431   ESTAB

The value on the left in the memory addrees within the TCB (TCP Block), this is precisely the TCP connection we will have to remove.

 

The command is:

IMP# clear tcp tcb 637E1AC0

NOTE: Please be sure of the value before deleting the TCP session, remember that the router may have HTTP, BGP, HTTPS and other important TCP connections.

Good luck, I hope it was useful,

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