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Tuesday, August 23, 2016

Please allow storage permissions in order to play FIFA 16 UT - Redmi Note 3 MIUI Version

Summary: 

After successfully downloading and installing FIFA 16 UT on my Redmi Note 3, i get this error:
"Please allow storage permissions in order to play FIFA 16 UT."

Problem or Goal:

Error while trying to load a new game/app installed on my android phone.


Please allow storage permissions in order to play FIFA 16 UT.

Cause:

Looks like a file permissions issue

Solution: 

Follow the pictorial "how to?" below to allow the FIFA app access to your device's storage before you it can successfully launch. 

1. There is a "Security" App on the Redmi Note 3, open it
Open the security app on your phone
2. Select Permissions
Go to the permissions menu

3. Open the permissions options
open permissions options
4. Go to storage
go to storage
5. Allow FIFA app to access the storage by enabling the button
enable FIFA 
Problem Solved?

Yes, try to launch the game/app again
FIFA now launches fine

Friday, August 12, 2016

Installing Tacacs plus to manage juniper routers, switches and firewalls

Summary:

Today am tasked with installing tacacs+ to manage authentication to all the IP nodes, most of the nodes here are juniper. sorry i won't be very organized in writing this article, i will pretty much paste every challenge and solution as i work, in fact this will be my new style of work instead of waiting to first finish the work and then putting in more time to write a clean article. let's face it, i suck at writing and am lazy just like all other engineers :-), so sorry if this article is a mess.

Problem or Goal:

To install TACACS+ to manage authentication to juniper nodes (routers, switches, firewalls)

Cause:

Consider this a good house keeping cause, you need centralized management of logins, logging, easy to manage users and an added layer of security.

Solution:

Working on setting up the server side

1. Platform

# cat /etc/*release
openSUSE 13.2 (x86_64)
VERSION = 13.2

2. Download site for TACACS+ rpm
3. ftp/sftp the above file to your server; you can use FileZilla or WinSCP
4. Install using Zypper (but oops, looks like i have some missing dependencies!!! welcome to the opensource world :-) )

# zypper --non-interactive install tac_plus-4.0.4.26-1.52.x86_64.rpm
Loading repository data...
Reading installed packages...
Resolving package dependencies...

Problem: nothing provides libtacacs.so.1()(64bit) needed by tac_plus-4.0.4.26-1.52.x86_64
 Solution 1: do not install tac_plus-4.0.4.26-1.52.x86_64
 Solution 2: break tac_plus-4.0.4.26-1.52.x86_64 by ignoring some of its dependencies

5. Download site for libtacacs

libtacacs1 rpm build for : OpenSuSE. For other distributions click libtacacs1.

Name : libtacacs1
Version : 4.0.4.26Vendor : obs://build_opensuse_org/home:anubisg1
Release : 1.52Date : 2013-08-24 07:40:02
Group : Development/Languages/C and C++Source RPM : tac_plus-4.0.4.26-1.52.src.rpm
Size : 0.35 MB
Packager : (none)
Summary : Tacacs+ library
Description :
This package contains TACACS+ library

RPM found in directory: /mirror/ftp5.gwdg.de/pub/opensuse/repositories/home:/anubisg1:/networking/openSUSE_Factory/x86_64

Download
ftp.pbone.netlibtacacs1-4.0.4.26-1.52.x86_64.rpm
     

6. Similarly download and ftp this package to your server
7. Install the libtacacs rpm as below:

# zypper --non-interactive install libtacacs1-4.0.4.26-1.52.x86_64.rpm 
Loading repository data...
Reading installed packages...
Resolving package dependencies...

The following NEW package is going to be installed:
  libtacacs1 

1 new package to install.
Overall download size: 24.1 KiB. Already cached: 0 B  After the operation, additional 354.6 KiB will be used.
Continue? [y/n/? shows all options] (y): y
Retrieving package libtacacs1-4.0.4.26-1.52.x86_64                                                                                                                          (1/1),  24.1 KiB (354.6 KiB unpacked)
Checking for file conflicts: ..............................................................................................................................................................................[done]
(1/1) Installing: libtacacs1-4.0.4.26-1.52 ................................................................................................................................................................[done]
Additional rpm output:
warning: /var/cache/zypp/packages/_tmpRPMcache_/libtacacs1-4.0.4.26-1.52.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID e558cb38: NOKEY

8. Now re-attempt to the tac_plus installation, this time it should be successful after adding the libtacacs dependency

# zypper --non-interactive install tac_plus-4.0.4.26-1.52.x86_64.rpm
Loading repository data...
Reading installed packages...
Resolving package dependencies...

The following NEW package is going to be installed:
  tac_plus 

1 new package to install.
Overall download size: 95.1 KiB. Already cached: 0 B  After the operation, additional 229.0 KiB will be used.
Continue? [y/n/? shows all options] (y): y
Retrieving package tac_plus-4.0.4.26-1.52.x86_64                                                                                                                            (1/1),  95.1 KiB (229.0 KiB unpacked)
Checking for file conflicts: ..............................................................................................................................................................................[done]
(1/1) Installing: tac_plus-4.0.4.26-1.52 ..................................................................................................................................................................[done]
Additional rpm output:
warning: /var/cache/zypp/packages/_tmpRPMcache_/tac_plus-4.0.4.26-1.52.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID e558cb38: NOKEY

9. Test your installation, looks good :-) 

# tac_plus -v
tac_plus version F4.0.4.26
ACLS
FIONBIO
LIBWRAP
LINUX
LITTLE_ENDIAN
LOG_DAEMON
PAM
NO_PWAGE
REAPCHILD
RETSIGTYPE RETSIGTYPE
SHADOW_PASSWORDS
SIGTSTP
SIGTTIN
SIGTTOU
SO_REUSEADDR
STRERROR
TAC_PLUS_PORT
UENABLE
__STDC__

10. Tacacs config file is located at: 

/etc/tac_plus.conf 

11. Tacacs manual is located at: 

# man tac_plus

12. The tacacs plus daemon is found at:
# /etc/init.d/tac_plus
Usage: tacacs {start|stop|status|restart|reload}

13. Starting tacacs (oops looks like we have an error! )

SMPP:/etc/init.d # ./tac_plus start
./tac_plus: line 16: /etc/rc.d/init.d/functions: No such file or directory
./tac_plus: line 19: .: /etc/sysconfig/network: is a directory
./tac_plus: line 22: [: =: unary operator expected
Starting tacacs+: ./tac_plus: line 35: daemon: command not found

14. Edit the tacacs plus init file to comment out the above lines and also delete the "daemon" command
# vi /etc/init.d/tac_plus

# Source function library.
#. /etc/rc.d/init.d/functions

# Source networking configuration.
#. /etc/sysconfig/network

start)
        # Start daemons.
        echo -n "Starting tacacs+: "
        /usr/bin/tac_plus -C $CONFIG ${LOGFILE:+-l $LOGFILE}  ${WHOLOG:+-w $WHOLOG} ${DEBUG_LEVEL:+-d $DEBUG_LEVEL}
        RETVAL=$?
        echo
        [ $RETVAL == 0 ] && touch /var/lock/subsys/tac_plus
        ;;

15. Attempt to start tacacs again:
SMPP:/etc/init.d # /etc/init.d/tac_plus start
Starting tacacs+: 

16. check to make sure it's running in the processes

SMPP:/etc/init.d # ps -ef | grep tac
root     20176     1  0 20:26 pts/0    00:00:00 /usr/bin/tac_plus -C /etc/tac_plus.conf







Problem Solved?

Monday, August 1, 2016

QoS Parameters to consider when setting the SLAs for VOIP Networks

Am currently working on a draft SLA (Service Level Agreement) with a VOIP carrier, here is a useful link i came across to guide me in setting the maximum allowed values, for both the transmission links and the end to end voice calls.

Things to consider are:

  • Latency: Delay for packet delivery
  • Jitter: Variations in delay of packet delivery
  • Packet loss: Too much traffic in the network causes the network to drop packets
  • Burstiness of Loss and Jitter: Loss and Discards (due to jitter) tend to occur in bursts