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Practical - Cisco, QoS, Routing, RIP, OSPF, Monitoring, WAN, Security, Switching, MPLS, ASA, Multicast



GNS3 - Running ASA in Win 7 - console hangs


Running ASA 8.02K8 inside of the gns3 on win 7 professsional 32bit caused, that console is hanging and did not answer, stay clear.

 

 

After starting ASA device everything looks good, Qemu loaded.

 

But console did not answer.



Problem with unpacking ASA image with unpack 0.1-win tool


When I was trying to unpack ASA 8 image using GNS3 utility unpack0.1-win on my windows 7, I always received following error:



How and where to find and download the Cisco SDM manager


The Security Device Manager, or SDM is possible to find on www.cisco.com on the following web link

http://www.cisco.com/pcgi-bin/tablebuild.pl/sdm

The Cisco Connection online (CCO) user guest account is needed, which we may create for free.

DHCP configuration using SDM

The flash animation explains how to configure DHCP server on a cisco router using the SDM. Where to find and how to install the SDM is described in this article.

 



Cisco-Linksys SRW 248G4 - system firmware recovery


In this article I will describe how to proceed if your firmware upgrade on SRW 248G4 switch failed and the switch then stop working.

I have found only one solution how to recover from this disaster and it is sending a new firmware over PC serial (COM) port using xmodem protocol. A new firmware can be send to the failed switch with the help of Startup menu of the switch. The Startup menu can be entered when the switch is booting.

So, steps are following:

Cisco Catalyst 2960 switch IOS recovery

Sometimes in my lab happens that students delete IOS of the switch from its flash. Unfortunately switches does not have rommon to realize quick IOS recovery over tftp. Only one way is over Xmodem.

Cat 2960 switchIOS recovery

To speed up the process of the recovery we may setup Xmodem speed to higher rate as default 9600 bits:

Set the speed rate to 115200 baud on the switch prompt of the switch:

Configuring complex dynamic ACL (Lock-and-Key)

In this article I will configure dynamic complex ACL (Lock and Key). This technique is described during CCNA4 Exploration.

About Lock and Key

Description from the cisco web

Configuration of the RIPv2 authentication

In this article I will configure, debug and shows the process of RIPv2 authentication.

 

Authentication methods

  1. Plain text
  2. MD5

 

Note 1: When using plain text authentication mode, make sure that the following parameters are matching on neighboring routers for successful authentication.

  • Key-string

  • Authentication mode

Konfigurácia smerovača vo funkcii Frame relay prepínača

Cisco smerovač môže byť nakonfigurovaný ako FR prepínač, kde pracuje ako DCE zariadenie. Konfigurácia spočíva v zapnutí FR prepínania a vypnutí IP smerovania, a v nakonfigurovaní prepínacej FR tabuľky, t.j. rámec vstupujúci cez ktorý vstupný port a s akým DLCI prepnúť na aký výstupný port a ako prepísať DLCI.

Zmena preddefinovaného telnet klienta v dynagene za putty

Dynagen obsahuje cmd príkaz, ktorý umožňujú pripojenie na konzolu virtuálnych routrov priamo z jeho príikazového riadku, je to príkaz telnet. Tento príkaz v dynagene spustí preddefinovaného klienta a pripojí ho na lokálny, v net konfigu zadefinovaný port. Vo windows to znamená že sa spustí windows telnet klient. Toto predefinované nastavenie môžeme zmeniť tak, aby bol spúšťaný iný klient, napr. preferované Putty.

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