The interface is just the outgoing interface in the forwarding table. The device alters the L2 header and sends the frame out of that interface L3 forwarding requires L2 header rewrite to get the frame to the next-hop. Routing - Packets are forwarded by a layer 3 gateway, aka router. Switching - Frames are forwarded by a layer 2 switch. Ronnie Royston Ronnie Royston 4, 1 1 gold badge 9 9 silver badges 28 28 bronze badges. Alex To Alex To 1. Ivana Nikolovska Ivana Nikolovska 1. While simple explanations are nice for those new to the topic, this video doesn't quite cut it.
I barely skims the surface. Even worse, it uses terminology that will only end up confusing those new to networking. Specifically it mentions routers bridging two networks and that misuse of terminology will likely cause confusion when bridging i. L2 or switching is actually discussed. Sign up or log in Sign up using Google. Sign up using Facebook.
Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Does ES6 make JavaScript frameworks obsolete? Podcast Do polyglots have an edge when it comes to mastering programming Upcoming Events. Featured on Meta. Now live: A fully responsive profile. Related 9. Hot Network Questions. Question feed. Accept all cookies Customize settings.
The difference exists because the physical network media for network Network prefixes and their dotted-decimal equivalents can be found in Figure At this point, the router can forward packets beyond the local network.
The router also supports static routing , a process where you can manually add routes to the routing table. If you plan to use static routing on this system, then router configuration is complete. However, you need to maintain routes in the system routing table. For information on adding routes, see Configuring Routes and the route 1M man page. Turn on the default IPv4 routing protocols in either of the following ways:.
For information about the routeadm command, see the routeadm 1M man page. This example shows how to upgrade a system with more than one interface to become a default router.
The goal is to make Router 2, which is shown in Figure , the default router for network Router 2 contains two wired network connections, one connection to network The example assumes that the router operates in local files mode, as described in How to Configure a Host for Local Files Mode. After becoming superuser or assuming an equivalent role, you would determine out the status of the system's interfaces.
The output of dladm show-link indicates that three links are available on the system. Only the ce0 interface has been configured with an IP address. You would begin default router configuration by physically connecting the bge0 interface to the Then, you would plumb the interface and make it persist across reboots. Continue by configuring the following network databases with information about the newly plumbed interface and the network to which it is connected:. Finally, use SMF to enable packet forwarding and then enable the in.
However, the default router configuration for network You would need to do the following:. Modify each host on Define a static route to the border router in the routing table of Router 2.
For more details, refer to Routing Tables and Routing Types. Both routers and hosts maintain a routing table. The routing daemon on each system updates the table with all known routes. The system's kernel reads the routing table before forwarding packets to the local network.
The routing table lists the IP addresses of networks that the system knows about, including the system's local, default network.
The table also lists the IP address of a gateway system for each known network. The gateway is a system that can receive outgoing packets and forward them one hop beyond the local network.
The following is a simple routing table for a system on an IPv4-only network:. You can configure two types of routing on an Oracle Solaris system: static and dynamic. You can configure either or both routing types on a single system. A system that runs only static routing does not rely on a routing protocol for routing information and for updating the routing table. Instead, you must maintain the system's known routes manually through the route command. For complete details, refer to the route 1M man page.
When you configure routing for the local network or autonomous system, consider which type of routing to support on particular routers and hosts.
The following table shows the different types of routing and the networking scenarios to which each routing type is best applied. The AS that is shown is Figure combines both static and dynamic routing.
To implement dynamic routing for an IPv4 network, use the routeadm or svcadm command to start the in. Dynamic routing is the preferred strategy for most networks and autonomous systems. However, your network topology or a particular system on your network might require static routing. In that case, you must manually edit the system routing table to reflect the known route to the gateway.
The next procedure shows how to add a static route. Note - Two routes to the same destination does not automatically cause the system to do load balancing or failover. Creates a route that must persist across system reboots.
If you want the route to prevail only for the current session, do not use the -p option. Indicates that the gateway system for the specified route has the IP address gateway-address. The following example shows how to add a static route to a system.
The system is Router 2, the default router for the In Example , Router 2 is configured for dynamic routing. To better serve as the default router for the hosts on network The routing table indicates two routes that Router 2 knows about. The default route uses Router 2's The second route, The gateway for this route is Router 1, with the IP address To add a second route to network Now the routing table has a route for the border router, which has the IP address In Oracle Solaris, a system with more than one interface is considered a multihomed host.
A multihomed host does not forward IP packets. However, you can configure a multihomed host to run routing protocols. You typically configure the following types of systems as multihomed hosts:.
NFS servers, particularly those servers that function as large data centers, can be attached to more than one network in order to share files among a large pool of users. These servers do not need to maintain routing tables. Database servers can have multiple network interfaces to provide resources to a large pool of users, just like NFS servers. Firewall gateways are systems that provide the connection between a company's network and public networks such as the Internet.
Administrators set up firewalls as a security measure. When configured as a firewall, the host does not pass packets between the networks that are attached to the host's interfaces. Note - When multihomed hosts have different types of firewalls on any of their interfaces, take care to avoid unintentional disruption of the host's packets. This problem arises particularly with stateful firewalls. One solution might be to configure stateless firewalling.
For more information about firewalls, refer to Firewall Systems in System Administration Guide: Security Services or the documentation for your third-party firewall.
The routeadm command without options reports the state of the routing daemons. According to the book Computer Networks in page by Lary L. Peterson , forwarding is a series of actions the router will take once receives a packet, including looking at its destination address, consulting a table, and sending the packet in a direction determined by that table.
However, routing here refers to the process by which the forwarding tables are built. Returning back to the original question, we can draw the conclusion that although we can keep a forwarding table and a routing table in the same structures, there are many reasons to separate them. A forwarding table usually needs to be structured to optimize the process of looking up an address when forwarding a packet, which holds more information such as MAC address.
In contrast, the routing table usually focuses on calculating changes in topology, and the entries in routing table are usually more succinct, only including the IP of next hop. Python Javascript Linux Cheat sheet Contact. Difference between routing and forwarding table Routing is the decision over which interface a packet is to be sent. Tags: Routing Forwarding.
0コメント