Concept of private VLAN
A VLAN allows unrestricted traffic flow among the hosts within the VLAN. When a packet is sent from a host to a destination machine within a VLAN, the switch sends that packet only to the destination host machine, not to every other host in the VLAN. But when a broadcast traffic is sent by a host machine, all other hosts in the VLAN receive the broadcast packets.
[Read more…] about How to Configure Cisco Private VLANs in 4 Easy Steps
At times, it is economical to build a VPN tunnel with the available networking resources. For example, if you have a VPN concentrator and you need to connect a small office securely with your network, you can do so by installing a low priced Cisco router in the remote office. This post will demonstrate how you can build VPN using a VPN concentrator and a Cisco router. [Read more…] about Site to Site VPN Between Cisco VPN Concentrator and Router
Since router is the key to access an organization’s network from the outside world, the maximum security priority should be given to routers that are connected to the Internet and to the important application servers. ISO-27001 has already defined standard router security checklist, which any organization can use to improve their router securities. This post aims to familiarize you with some critical router security checklist so that you can have an in-depth and clear understanding of router security standards.
Virtual private network can be configured with most of the Cisco routers( 800 to 7500 series) with IOS version 12 or higher.VPN can be implemented in a number of ways–with various level of security measures and configuration. To determine the right VPN configuration for your network, you need to have a solid understanding in cryptographic system and encryption algorithm.Besides, one needs to know which type of VPN is suitable for remote clients and which type of VPN is used to create secure site-to-site connection. This article explains the necessary steps with configuration script to setup VPN in Cisco routers. This configuration can be simulated in Cisco packet tracer software as well. [Read more…] about Cisco VPN Configuration in IOS Routers
What is ACL: Access control list or ACLs are a set of if-then rules set on a router to allow or deny a specific group of IP to send or receive traffic from your network into another network.
When you apply an ACL to a route interface  for incoming traffic then every incoming packets will be compared with your ACL first, if a match is found then either permit or deny action will take place according to your configuration of the ACL. If there are more than one ACL and if there is no match after comparing the incoming packets with the first ACL, then the second ACL will be matched and so on. Remember there is an implicit deny after an ACL. That is why after permit or denies any IP or IP range you must add the command: access-list ip permit any any.
For example in your network you want that no computer or devices from 172.16.0.0 network can send traffic to your network. To implement this rule you need to write and ACL that will tell your router to discard all the traffic from 172.16.0.0. Now, let see how to implement this ACL into a router.
Rourter#configure terminal
Router(config)# access-list 10 deny ip 172.16.0.0 0.0.255.255
Router (config) #access-list 10 permits ip any any
[Read more…] about Access Control List Configuration on Cisco Router
Securitywing.com reserves the copyrights of all of its published articles.No contents of this site is permitted to be published to anywhere else in the Internet.If any contents are found in any other websites, securitywing reserves the rights to file a DMCA complaint. But you have the right to use the link of any relevant article of this site to point from your website if you consider that it might improve the quality of your article.