GRE Tunnel Between Cisco and Linux

Generic Routing Encapsulation – GRE is a tunneling protocol originally developed by Cisco that encapsulates various network protocols inside virtual point-to-point tunnel. It transports multicast traffic via GRE tunnel so it allows passing of routing information between connected networks. As it lacks of security it is very often used in conjunction IP SEC VPN that on […]
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EtherChannel,VRRP, DHCP, OSPF Configuration - Cisco, Vyatta, Microcore

The tutorial shows EtherChanel, VRRP, DHCP and OSPF configuration on Cisco, Vyatta and Microcore Linux.  A campus network (look at figure 1) is created with Access and Distribution layer. Instead of Layer 2 switches in Access layer there is Cisco Router 3725  occupied with NM-16SW module in this layer and Cisco  is emulated by Dynamips. […]
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Router on a Stick Configuration - Juniper, Cisco, Vyatta

Layer 2 switch is  a network device which provides network access for hosts connected to its ports. Hosts  are grouped  in to VLANs  according to switch port configuration.  If they are hosts belonging to different VLANs it is not connectivity between hosts (http://en.wikipedia.org/wiki/Virtual_LAN) so it must be a mechanism which provides connectivity  – routing between  […]
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Simple Compatibility test between Cisco, Vyatta and LISA

In the previous tutorials I showed how to create Vyatta and LiSA qemu image. Now, it is time play a little bit with these network devices and to make simply compatibility test between Cisco 3725, Vyatta 6.1 Core and LiSA. I created a test topology with two Vyattas, Cisco 3725 router, with NM-16SW, Cisco 7206VXR […]
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