Hardware in lab
In the part one I will show how to convert Wireless Controller Based Cisco access point into Autonomous mode. Then in the second part I will use it as a site survey device utilizing 10KHz spectrum analyser sensor. Continue reading
Linux console port serial connection it is very handy way of managing Cisco switches and routers. This is especially useful when you are connecting using older laptop with COM port. Please follow step-by-spe guide to configure Cisco Serial Console Connection in Linux: Continue reading
Directory of flash:/
509 -rwx 2301 Mar 1 1993 00:24:41 +00:00 config.text
510 -rwx 24 Mar 1 1993 00:24:41 +00:00 private-config.text
511 -rwx 2072 Mar 1 1993 00:24:41 +00:00 multiple-fs
512 -rwx 3584 Mar 1 1993 00:38:49 +00:00 tftp
2 drwx 512 Mar 1 1993 00:15:19 +00:00 c3750-ipbasek9-mz.122-55.SE7
The command below creates new archive saved.tar including all files and directories in c3750-ipbasek9-mz.122-55.SE7 directory and saves the TAR archive on tftp server.
Switch#archive tar /create tftp://192.168.173.1/saved.tar c3750-ipbasek9-mz.122-55.SE7
IP is the most commonly used communication protocol suite in Internet. Most of us know that this 32bit IP address range has been divided on public and private addresses – what we have at home (private) and what is reachable on Internet (public). But underneath there are more IP pools and not everyone knows that in the IP world there are special address ranges used to cover extra tasks and services provided for us like stream video, routing updates and time updates.
During the exhaustion 32bit ver4 IP pool have changed and the modern division approved by Cisco and Internet Organisations (IEEE and IANA) is the current standard shown below. Continue reading
As the Packet Tracer network simulator from Cisco has been designed to help CCNA students go through a course, we cannot expect to work it with all stuff what is beyond of CCNA. Therefore I found really frustrated to make few configurations from LAB into PT, spending hours to figure out that is not possible to implement them. Continue reading
Follow these steps to enable https secure web configuration on your router or switch:
username tech privilege 15 secret 0 userpassword '<-- create user tech with the highest privileges'
ip http server '<-- enable http access'
ip http access-class 23
ip http authentication local '<-- enable local authentication'
ip http secure-server
ip http timeout-policy idle 60 life 86400 requests 10000
VLANs concept is very well known to separate network traffic on single switch to increase security. This allows more clearer network design minimizing needs for an additional hardware to deployed. The below example has been tested on Cisco 1900 series router eqquipped with EHWIC-4ESG-P EtherSwitch card. This configuration supports up to 16 VLANs but higher end devices can support up to 4096 VLANs. Please refer to your device documentation for more details. Continue reading
Linux console port serial connection
apt-get install minicom
Discover your serial com port, here it will be ttyS0
logger@syslog0050:~$ dmesg | grep tty
[ 0.000000] console [tty0] enabled
[ 1.030584] 00:08: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
NVI – NAT Virtual Interface
Not everyone knows that from IOS version 12.3(14)T, Cisco has introduced a new feature called NAT Virtual Interface; NVI removes the requirements to configure an interface as either NAT inside or NAT outside. An interface can be configured to use NAT or not use NAT.
How to use NVI? It’s easy! You must use the command ‘ip nat source …’ without specifying the inside/outside tag and enable the nat to the interfaces using the command ‘ip nat enable’. Continue reading