When OSPF is first enabled on the NBMA network, OSPF defaults to the non-broadcast model. Hello packets and dead intervals are 30 and 120 seconds, and the non-broadcast model requires that neighbors be configured. The router then sends packets to configured neighbors to find the identity of the DR. This is very similar to the broadcast model, except that the router sends unicast hellos to configured neighbors. The non-broadcast model also has slower convergence,..
Configuring Basic IP Dialup Services
Up to this point, we have been examining the IOS software's routing protocol and IP packet-switching capabilities. The IOS software also enables remote access in the routers and access servers. The remote access capability is available as both asynchronous dialup via external and integrated modem modules, and via ISDN. Remote access provides both remote users and remote routers with the capability to connect to IP network services when they are not connected directly to a net..
One advantage of the single CPU architecture is that performance improvements could be obtained merely by increasing the speed of the CPU (which occurred through the CSC and CSC3 motherboards, respectively). However, as the demand for greater throughput increased, it became necessary to increase the bus speed and offload some of the switching from the CPU. A new series of bit-slice-processor interface cards, coupled with a 533 Mbps cbus and associated controller, did just tha..
Cisco Security Agent and Host-Based IDS
CSA provides threat protection for servers and PCs. CSA identifies and prevents malicious behavior, thereby eliminating known and unknown security risks. Typically, devices with antivirus software do not detect the latest worms or code violations. CSA fills in this gap by triggering an alert to the system or the management server any time an application or packet tries to use the kernel inside a Windows-based system. CSA also blocks the attack. CSA can be installed as a stand..
unneling IPv6 Through an Existing IPv4 Network
The easiest way to pass IPv6 traffic through a section of IPv4 network that doesn't offer native IPv6 support is to create a simple GRE tunnel: Router1#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router1(config)#interface Loopback1 Router1(config-if)#ip address 10.15.1.11 255.255.255.255 Router1(config-if)#exit Router1(config)#interface Tunnel1 Router1(config-if)#ipv6 address BBBB:1::1/126 Router1(config-if)#ipv6 rip RIP_PROC ..
