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Tag: Cisco

  • How to configure Static NAT in Cisco IOS Routers – Part 2

    We discussed NAT Overloading in the Part-1 of our Cisco IOS NAT configuration here

    Here, we will configure a Static NAT on Cisco IOS Routers. Static NAT is rather straightt forward as it is a one to one NATing between IP addresses as against the NAT Overloading or the Dynamic NAT where the IP addresses from the inside are NATed to a pool of IPs.

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  • How to configure GLBP in Cisco IOS Routers

    Gateway Load Balancing Protocol (GLBP) as the name implies can be used to configure Gateway redundancy between a group of routers and at the same time load balance the traffic across all of them. GLBP is similar to the High availability protocols Hot Standby Redundancy Protocol (HSRP) & Virtual Router Redundancy Protocol (VRRP) except for the load balancing capabilities wherein HSRP and VRRP, the standby routers are configured for redundancy and act as standby only and become active only when the active router fails.

    The advantage of GLBP is it provides load balancing over multiple routers (gateways) using a single virtual IP address and multiple virtual MAC addresses. The forwarding load is shared among all routers in a GLBP group rather than being handled by a single router while the other routers stand idle. Each host is configured with the same virtual IP address, and all routers in the virtual router group participate in forwarding packets. GLBP members communicate between each other through hello messages sent every 3 seconds to the multicast address 224.0.0.102, User Datagram Protocol (UDP) port 3222 (source and destination).

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  • How to add Static routes and Default routes in Cisco IOS

    Static routes allow administrators to configure routes for specific hosts or networks manually as against learning dynamically using routing protocols like RIP, EIGRP and OSPF. Static routes basically tells the Cisco IOS of which next hop router or the exit interface on the local router that the traffic for a particular host or network needs to be passed to.

    To add a Static Route in cisco ios based switches and routers the following is the command syntax. This command is run from the global configuration mode.

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  • How to Add a Banner in Cisco IOS Routers and Switches

    Banners are one of the important things for any device that allows remote access either for administration or for user access. They serve their purpose of warning any unauthorised users and make them aware that the device or the server is protected and being monitored and also provide a quick snapshot of what the system is and what is it used for. For example, we use banners for security warning and the device details and the service/application related to it.

    Adding a Banner to Cisco Router or a Catalyst switch running Cisco IOS is all a matter of one simple command.

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  • How to run remote commands on Cisco Routers and Switches using RSH

    If you are already a UNIX or LINUX administrator, you by now know what is rsh and how it can be used to run commands on a remote server. This is no different to running commands on a Cisco Routers and Switches.

    You can run commands on your cisco routers and switches remotely from linux or unix servers and infact Windows XP, Windows 2003, Windows Vista systems.

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  • How to backup and restore Cisco Routers switches using a FTP Server

    I just wrote about backup and restore of Cisco Router and Switches using a TFTP Server & HyperTerminal Emulator program. Let's now backup Cisco Switches and Routers using a FTP Server.

    To backup a Cisco Router or Switch to a FTP server, the FTP server should be reacheable from the router or switch.

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  • How to Backup & Restore config in Cisco routers and switches using Hyperterminal

    The easiest method to backup Cisco routers and Switches would be when you are logged onto it using a tool like HyperTerminal either via telnet,ssh or via console.

    For information on how to backup config on a cisco router or a switch using TFTP click here

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