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Howto Setup Cisco Router Enable Password

Nov 142007

There are five passwords used to secure your Cisco routers: console, auxiliary, telnet (VTY),enable password, and enable secret. Just as you learned earlier in the chapter, the first two passwords are used to set your enable password that’s used to secure privileged mode. This will prompt a user for a password when the enable command is used. The other three are used to configure a password when user mode is accessed either through the console port, through the auxiliary port, or via Telnet.

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Securing Cisco Routers by Disabling Unused Services

Security 1 Response »

Nov 122007

On Cisco routers, a whole bunch of services come enabled by default.your first order of operation would be to ensure that the all unused services are disabled.

Now we will see how to disable some services on cisco router for security purpose.

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Special Purpose Network Addresses Every System admin need to know

Network 4 Responses »

Feb 172007

Different types of Classes of Network

Class A Addresses

Class A address must be between 0 and 127

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Local DNS Cache for Faster Browsing on Ubuntu System

Other Linux 5 Responses »

Jan 082007

A DNS server resolves domain names into IP addresses. So when you request “yahoo.com” for example, the DNS server finds out the address for the domain, and sends your request the right way.

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Linux SNMP OID’s for CPU,Memory and Disk Statistics

General 25 Responses »

Sep 122006

SNMP stands for Simple Network Management Protocol and consists of three key components: managed devices, agents, and network-management systems (NMSs). A managed device is a node that has an SNMP agent and resides on a managed network. These devices can be routers and access server, switches and bridges, hubs, computer hosts, or printers. An agent is a software module residing within a device. This agent translates information into a compatible format with SNMP. An NMS runs monitoring applications. They provide the bulk of processing and memory resources required for network management.

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Activate NAT on Debian etch and Disable IPv6 support on Debian

Network 2 Responses »

Sep 102006

Activate NAT on Debian etch

What is NAT ?

network address translation (NAT, also known as network masquerading or IP-masquerading) involves re-writing the source and/or destination addresses of IP packets as they pass through a router or firewall. Most systems using NAT do so in order to enable multiple hosts on a private network to access the Internet using a single public IP address (see gateway). According to specifications, routers should not act in this way, but many network administrators find NAT a convenient technique and use it widely. Nonetheless, NAT can introduce complications in communication between hosts.

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