Default route cisco
Cisco has introduced a new class of switches called the Default Route Group. This is designed for security purposes and provides security for LANs and offices in which two or more internal networks share a common subnet. If there is a default route, traffic to this internal network will be forwarded to the internal offices instead of the external network. Basically this class of switches have built in forwarding for all the internal networks on a same network.
To get started with this new feature, it is necessary to change the default route configuration in the switch. To do this one needs to go to Administration/Settings/Dynamic Hosting and then select the Static Route tab. The same as with the Normal route configuration, one is required to enter the IP address of the internal network that requires to be given the forwarding options. It is necessary to enter the IP addresses of at least one internal network. The IP address of the default route is not used by this class of switches. The reason behind this is that this class of switches does not have any forwarding capabilities built in, so it requires the administrator to provide these forwarding options.
There are various reasons why a static route is used in a Cisco device. First of all, it allows a company to avoid using their internal network for most of their internal processes and applications. With this feature they are able to maintain some degree of security for their system. If there happens to be an unauthorized access from an external source, they will still be able to send packets to the internal network which will make them believe that the source of the packet is their internal network.
Default route cisco
Another reason for using a static route is because of the limited number of IP address that can be assigned per network. If the number of IP addresses available to be assigned is not enough, then a default route will be the best option. With this kind of switch the administrator can also opt for a limited routing table as well. The use of a static route is preferred especially in small networks where every IP packet is important. The small size of the network makes the probability of having to use the default route is very slim.
There are also many other benefits that can be associated with a Cisco switch that uses the ICMP Echo Request. The use of this feature enables the Cisco switches to reply to ICMP Echo requests from other systems. These are specially made ICMP Echo packets that have destination unreachable fields. However, unlike normal or private ICMP Echo requests the ICMP Echo reply does not include the destination field. This can sometimes lead to overload on the routers.
One problem that can occur with the use of a default route is when more than one system on the same subnet is using the same router port. When two systems share the same router port they will try to contact the other system whenever they send a ping request. In some cases this can result in the ICMP Echo requests going to the second system instead of the one that sent it.
This kind of scenario can be avoided by using the private default route. The private default route is also used with different keywords that are required to configure the router. However, the keywords will depend on the type of service provider that one is using. The keywords will also differ if the service provider is T1 lines or OSPs. The other option will be to use the default route which is always associated with the lowest port number.
There is one more scenario that can happen when two systems are using the same default router port. In this case both systems will try to contact the other system with the same router port. When the source systems are on different networks and each of them sends out broadcast DNS packets on the same ports, the routers will collide with each other. If the source is on the same network as the target system, the collision will occur on the target system. In this case the source will respond with a broadcast ICMP destination unreachable packet, thus blocking all the other systems from reaching the target.
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