Cisco


Access Lists

Access control lists (ACLs) provide a means to filter packets by allowing a user to permit or deny IP packets from crossing specified interfaces. Just imagine you come to a fair and see the guardian checking tickets. He only allows people with suitable tickets to enter. Access lists filter network […]


How to edit access list lines ?

Most CCNA books say modifying existing ACL or inserting lines into existing ACL can’t be done….well that shows you shouldn’t believe everything you read 🙂 If the IOS image running on the router supports ACL line number, then following is the procedure you can follow. First do a show access-list at the […]


NAT Overload (PAT)

If you have few global IP address and hundreds of inside local address to translate. In such situation you need to use NAT Overload, also known as PAT. In this example our internal network is using 192.168.0.0 network and we are using only one global IP address 200.2.2.1 configure Router […]