Category: Configuration Example
Configuration Example, Routing
Netstat on IOS router
I often use the netstat command on a Windows machine to check on which IP and/or ports the servers or workstation is listening or established connection. By accident I found the same kind of command for a Cisco IOS router, while I was looking through the CLI. Check out the output below: Router#sh control-plane host … Read More
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