Category Archives: IP Addressing

DHCP Snooping Explained

WHAT IS DHCP SNOOPING? The Dynamic Host Configuration Protocol (DHCP) allocates IP addresses dynamically, it leases addresses to connected devices and the addresses can be reused when no longer needed. All connected Hosts and end devices that require IP addresses obtained through DHCP must communicate with a DHCP server across the LAN. DHCP snooping acts like a firewall… Read More »

What is Stateless DHCPv6? Explained with Examples

Stateless DHCPv6 Server and Client Auto-configuration. During the SLAAC process, the client receives information to create an IPv6 global unicast address. This includes the default gateway information from the source IPv6 address in the RA message, which is the link-local address of the router. A stateless DHCPv6 server can be used to provide information that might not be… Read More »

What is Stateful DHCPv6: DHCPv6 Autoconfiguration- Server and Client.

How to Configure DHCPV6 Stateful Auto-configuration (Server and Client ) DHCPv6 Server command Terms: IPv6 dhcp pool: This command creates a pool and enters the router in DHCPv6 configuration mode. Address : This command is used to indicate the pool of addresses to be allocated by the server. The lifetime option indicates the valid and preferred lease times in seconds.… Read More »

What is GLBP? Explained with Examples

Understanding Gateway Load Balancing Protocol (GLBP) Gateway Load Balancing Protocol (GLBP) is a Cisco proprietary solution for redundancy and load balancing in an IP network. GLBP allow automatic selection and simultaneous recovery from first hop router failures. GLBP provides load balancing over multiple (router) gateways using a single virtual IP address and multiple virtual MAC addresses.  Each host… Read More »

What is IPv6? Explained with Examples

What is IPv6? IPv6 is the next generation of IP addressing or Internet Protocol. The previous version of IP addressing (IPv4) is depleted or near depletion. IPv6 was created by the Internet Engineering Task Force (IETF), a standards body, as a replacement to IPv4 in 1998. However, IPv6 is equipped with so much improved features and limitless opportunities… Read More »

What is CIDR? Explained with Examples

CIDR (Classless Inter-Domain Routing) was introduced in 1993 (RCF 1517) replacing the previous generation of IP address syntax – classful networks. CIDR allowed for more efficient use of IPv4 address space and prefix aggregation, known as route summarization or supernetting. CIDR introduction allowed for: More efficient use of IPv4 address space Prefix aggregation, which reduced the size of… Read More »

What is DHCP Lease Periods?

Configuring DHCP Lease Periods on Cisco router. You want to change the default lease period on your router. To change the default DHCP lease time for a pool of IP addresses, use the lease configuration command: R1#configure terminal R1(config)#ip dhcp pool R1(dhcp-config)#lease 5 12 30             R1(dhcp-config)#end R1# With The lease… Read More »

How to Configure DHCP on Windows PC Examples

Enabling DHCP on Windows PC. Dynamic Host Configuration Protocol  (DHCP) as mentioned earlier, is system software  utility that automatically assigns network IP addresses to computers that are connected to one another, when internet connection is involved, an IP address will be assigned. DHCP normally is enabled by default, it can be disabled for some reason especially when a static address… Read More »

What is DHCP ? Explained with Examples

Dynamic Host Configuration Protocol – DHCP. Dynamic Host Configuration Protocol works in a client/server mode. DHCP enables clients on an IP network to obtain or lease IP address or configuration from a DHCP server. This reduces workload when managing a large network. DHCP protocol is described in the RFC 2131. Most modern operating system includes DHCP in their… Read More »

How to Configure DHCP on a Cisco Router Example

How To Assign IP Addresses with DHCP on Cisco Router. DHCP assigns IP addresses and other important network configuration information to clients dynamically. Cisco router uses the Cisco IOS feature known as Easy IP as an optional DHCP server. Easy IP leases IP configurations to network clients for 24 hours by default. We use the topology diagram below as sample… Read More »