Category: Configuration Example
Telnet Time-Out is killing me….
Aaarrrgggghhh, I hate it when I would like to telnet into a device and enter the wrong IP address. This means, by default, waiting for 30 seconds before being able to correct the IP address and start a new telnet session, because there is no escape sequence. SW01#telnet 10.100.12.250 Trying 10.100.12.250 … % Connection timed out; … Read More
Alias IOS Command
When configuring a router I often use different show commands to check or troubleshoot the configuration. I always hate to type in the whole show command, so I use aliases instead. Aliases are also used in the Open Source community, when working with a terminal. There are multiple options for the alias command, lets take … Read More
Configuration Example, Routing
HSRP and ACL’s
I added a Guest VLAN to a network environment with two multi layer switches running HSRP. To secure the internal network from the Guest VLAN, I added a ACL to the Guest VLAN SVI. The ACL is stated below: ip access-list extended GUEST-DENY-RFC1918 remark Allow DHCP permit udp any eq bootpc any remark Deny RFC … Read More
Configuration Mode Locking
While browsing some networking related blogs, so stumbled on a nice new feature in Cisco IOS on 6200networks.com. The feature prevents multiple users from changing the configuration of a network component simultaneous. This feature, configuration mode locking, is available in two different modes: Automatic – the session is locked, when you log in to the … Read More
Configuration Example, Security
Cygwin with OpenSSL for CSR generation
A lot of services, which are published to the Internet, are secured with SSL certificates. A lot of times we use SSL certificates to secure communications when implementing ISA reverse proxy servers, Citrix Secure Gateway servers and/or Cisco WebVPN portals. When you want to secure a connection with a SSL certificate you have to create … Read More
Configuration Example, Firewalling
Secure Copy Server Cisco ASA
Lately there are a lot of changes in the firmware and the ASDM for the Cisco ASA firewalls. This means a lot of copying from files to the flash memory of the specific appliances. Normally when upgrading the software from an appliance I use a computer on the customer network. This could be my own … Read More