Network and Internet
What Is Routing?
Routing is the determination of which way data packs are sent from the source network to the target network. The routing device compares the target IP address with information on its own routing table. What is Routing question is especially important for businesses that use branch links, different VLANs, VPN and multiple internet lines.
How does the Routing table work?
In the routing table, the target network has the next gateway if necessary, the output interface and the subsequent gateway. It is considered to match the longest prefix before the package. The preferred and metric rules of the platform used when there are more than one candidate to the same goal.
The default route is used when there is no more special match. The default gateway adjustment of the computer plays a role in reaching targets outside its own local network. The error gateway or conflicting IP plan can cause remote systems access when local communication is working.
Static routing and dynamic routing
The route is defined by the manager in static routing. Management in a small number of networks and fixed connections can be easy; When the ballology changes, it is necessary to update the routes manually. In dynamic routing devices share network information accessible through protocols.
OSPF and BGP are redirect protocols used in different purpose and scales. The presence of a protocol does not provide uninterrupted passage alone; spare links are part of the design of zoom behavior and security settings. A small office can create unnecessary complexity management load.
Routing, NAT and firewall difference
Routing determines the way for package. NAT address does not translate; For example, special addressed devices are used on the internet output. Firewall implements designated access policies. The same device does not mean that it is automatically allowed to add a route if three things can do.
For example, the right route must be both appropriate access rule to the application server of the sale VLAN. It is necessary to work on the return path. Only one-way package flow can lead to missing diagnosis.
When examining Routing problems
- Verify source and target IP addresses, network masks and gateways.
- Check the right target and next step in the routing table.
- Check out the way of departure and return together.
- Estimate the rules of Firewall and NAT separately from routes.
- Store the configuration before change; prepare a return plan.
Frequently Asked Questions
Is it the same thing to switch with Routing?
No. Basically, switching takes care of the package paths between different IP networks, with the transmission of frames in the local network. Layer 3 switch redirect can also do.
Is there any dynamic routing required in each office?
No. The required number of networks depends on the variable and backup design of connections.
Does Ping work all links if it is successful?
No. ICMP access does not show the ports, authentication and return traffic of an application.
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Resources & Advanced Reading
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