Archive for the 'SNRS' Category

Static NAT overloaded???

Wednesday, July 27th, 2011

So we have already looked at all 3 possible NAT configurations, however there is one more trick that is always useful to know. How to overload a Static NAT. Let’s assume the following for this example We have 2 public IP addresses ( & The IP address on the outside interface has been configured [...]

Decrypting Type 7 Passwords (enable password)

Wednesday, August 19th, 2009

The big difference between the enable password and the enable secret is the encryption level. The enable password by default is saved in clear text so when looking at the running-configuration of the router you will be able to read the password. It is possible to encrypt this password using the service password-encryption command.   [...]

Restricting access to VTY (Virtual Terminal Lines)

Friday, August 14th, 2009

One of the first and most important things to configure on any Cisco device after allowing telnet or SSH, is to restrict who is allowed to access the device. Of course having a password on the lines is the first step but if telnet is the method of communication, all passwords will be sent over [...]

Configuring Syslog on Cisco Routers

Thursday, July 30th, 2009

As part of any management and audit solution for networking, Syslog is vital.   Syslog messages allow us to track system error messages, exceptions, and other information, such as device configuration changes. It allows for historical reporting, depending on the application keeping the logs, as well as help in fault finding.   Cisco devices support [...]