When troubleshooting a problem with Access Control lists, one of the things you would want to do is to clear the counters on the ACL matches.
In Cisco IOS, you can clear the ACL Matches counters as follows:
Author: admin
How to set the default gateway in Redhat Enterprise Linux
The Default Gateway is the IP Address of a router or a routing device to which all the packet to a destination for which the server doesn't have a route will be forwarded to. Most of the servers in any network leave the routing job to the routers meaning there will be a default gateway added to the system and very little (if any) static routes added to it. This makes management much easier.
This procedure should work on Redhat Enterprise Linux, Fedora, Centos.
How to add/modify IP Address in Redhat Enterprise Linux
Adding the IP Address in Redhat Enterprise Linux can be done by using the netconfig tool or by editing the network-scripts or by using the ifconfig command. While this procedure is tested on Redhat Enterprise Linux, I'm sure it should work on CentOS, Fedora and older Redhat versions.
Logging Synchronous while working in Cisco Router/Switch Console
Another beginner tip that can be useful!
When you work on the Cisco Router or Catalyst Switch console, it would be annoying to have the console or terminal (telnet/ssh) logs to pop in between your commands. This can be even more irritating when it is busy switch or a router spitting messages continuously.
Default Link/Port costs for Spanning Tree Protocol (STP)
With Spanning Tree Protocol, messages from a connected device always takes the least cost path to the Root Bridge. The least cost path also called as Link Cost or Port cost is the lowest cost path of the one or more paths available from the device to the root bridge. Each link type has its own default costs which is used by the Spanning Tree Protocol (STP) to calculate the least cost path.
Configure Access/trunk/Dynamic modes in Catalyst switches unconditionally
In Cisco Catalyst switches, each switchport can be set to different VLAN Membership modes using the "switchport mode" command. This sets the port unconditionally.
The different modes include
Configure Named Acces Control Lists (ACL) in Cisco Routers
With Cisco IOS version 11.2, Cisco introduced the Named ACLs. Named ACLs are Standard or Extended ACLs which are give names instead of a ACL number. Technically, other than giving a name to the ACL there isn't any other difference when it comes to the functionality as in Standard or Extended ACL.