{"id":1265,"date":"2025-08-02T07:08:45","date_gmt":"2025-08-02T07:08:45","guid":{"rendered":"https:\/\/www.zframez.com\/articles\/?p=1265"},"modified":"2025-08-02T07:08:48","modified_gmt":"2025-08-02T07:08:48","slug":"routing-table-fields-explained-next-hop-exit-interface-metric-and-gateway","status":"publish","type":"post","link":"https:\/\/www.zframez.com\/articles\/networking-fundamentals\/routing-table-fields-explained-next-hop-exit-interface-metric-and-gateway","title":{"rendered":"Routing Table Fields Explained: Next Hop, Exit Interface, Metric, and Gateway"},"content":{"rendered":"\n

Next Hop, Exit Interface and Metric \u2013 Fields in a Routing Table<\/strong><\/p>\n\n\n\n

In the previous <\/a>tutorial<\/a>, we discussed how network addresses<\/strong> are used in the routing table. In this one, we\u2019ll look into a few more fields you\u2019ll commonly see in a routing table \u2013 like Next Hop<\/strong>, Exit Interface<\/strong>, and Metric<\/strong>.<\/p>\n\n\n\n

If you haven\u2019t already gone through the basics of routing, static and dynamic routing, you can check this introduction to routing<\/a> first.<\/p>\n\n\n\n

\n\n\n\n

Next Hop<\/strong> <\/p>\n\n\n\n

Next hop<\/strong> simply means the next router (or next device) to which a packet should be forwarded in order to reach the destination network.<\/p>\n\n\n\n

When a router receives a packet, it checks the destination IP and looks into its routing table. If the destination is not directly connected, it will send the packet to another router \u2013 and that router is called the next hop<\/em>.<\/p>\n\n\n\n

Example:<\/strong><\/p>\n\n\n\n

\"Diagram
R1 routing to remote networks via next-hop gateways R2 and R3<\/figcaption><\/figure>\n\n\n\n

In the above topology :
R1 has IP 1.1.1.1\/24
R2 has IP 1.1.1.2\/24
R3 has IP 1.1.1.3\/24<\/p>\n\n\n\n

All three are connected to the same switch (so part of the same network).<\/p>\n\n\n\n

    \n
  • R2 is also connected to network 2.2.2.0\/24<\/li>\n\n\n\n
  • R3 is connected to network 3.3.3.0\/24<\/li>\n<\/ul>\n\n\n\n

    Now, if we look from R1\u2019s perspective:<\/p>\n\n\n\n

      \n
    • To reach 2.2.2.0\/24, R1 will send packets to R2, so 1.1.1.2 <\/strong>becomes the next hop.<\/strong><\/li>\n\n\n\n
    • To reach 3.3.3.0\/24, it will send to R3, so 1.1.1.3 is the next hop<\/strong>.<\/li>\n<\/ul>\n\n\n\n

      So in R1\u2019s routing table, we\u2019ll have something like:<\/p>\n\n\n\n

      2.2.2.0\/24\u00a0\u00a0 via 1.1.1.2<\/p>\n\n\n\n

      3.3.3.0\/24\u00a0\u00a0 via 1.1.1.3<\/p>\n\n\n\n

      You can remember it this way:<\/p>\n\n\n\n

      Next hop = IP of the facing router you\u2019ll send the packet to.<\/strong><\/p>\n\n\n\n

      Also note: The next hop IP<\/strong> will always be on the same network as the interface we\u2019re sending the packet out from.<\/p>\n\n\n\n

      \n\n\n\n

      Exit Interface<\/strong><\/p>\n\n\n\n

      Exit interface<\/strong> is the interface on our router that will be used to send the packet out.<\/p>\n\n\n\n

      For example, if R1 is using interface eth0 to connect to R2 and R3, then the routing table may also show:<\/p>\n\n\n\n

      2.2.2.0\/24\u00a0\u00a0 via 1.1.1.2\u00a0\u00a0 dev eth0<\/p>\n\n\n\n

      3.3.3.0\/24\u00a0\u00a0 via 1.1.1.3\u00a0\u00a0 dev eth0<\/p>\n\n\n\n

      That just means \u2014 \u201cto reach this destination, send the packet via this interface, to this next hop.\u201d<\/p>\n\n\n\n

      In some setups (like point-to-point links), routers may only show the interface instead of next hop \u2014 but both serve the same purpose: how and where to forward the packet<\/strong>.<\/p>\n\n\n\n

      \n\n\n\n

      Metric<\/strong><\/p>\n\n\n\n

      Metric<\/strong> is used when there are multiple possible paths to reach the same destination.<\/p>\n\n\n\n

      Let\u2019s say a router has two ways to reach the same network. How does it decide which one to use?
      It picks the one with the lowest metric<\/strong>.<\/p>\n\n\n\n

      Think of metric as the cost or distance<\/strong> to reach a network. Lower metric = preferred path.<\/p>\n\n\n\n

      Different routing protocols calculate metric differently:<\/p>\n\n\n\n

        \n
      • RIP<\/strong> uses hop count<\/li>\n\n\n\n
      • OSPF<\/strong> uses bandwidth<\/li>\n\n\n\n
      • EIGRP<\/strong> uses delay, bandwidth, and a few other things<\/li>\n<\/ul>\n\n\n\n

        You don\u2019t need to go deep into how each protocol works right now \u2014 but just remember:<\/p>\n\n\n\n

        Routers use metric to choose the best path among multiple options.<\/strong><\/p>\n\n\n\n

        \n\n\n\n

        Gateway<\/strong><\/p>\n\n\n\n

        The term Gateway<\/strong> can have slightly different meanings depending on the context.<\/p>\n\n\n\n

        1. Gateway as a general term for a router<\/strong><\/p>\n\n\n\n

        Before the term \u201crouter\u201d became popular, people used the word gateway<\/strong> to refer to a device that forwards packets between networks. So in some explanations, especially older ones, you might still hear phrases like:<\/p>\n\n\n\n

        \u201cThere are multiple gateways in the path to reach the destination.\u201d<\/p>\n\n\n\n

        In this case, gateway just means a router<\/strong>.<\/p>\n\n\n\n

        2. Gateway as Next Hop<\/strong><\/p>\n\n\n\n

        Often, gateway<\/em> is used in place of next hop<\/em>.
        For example, in the topology above, we can say:<\/p>\n\n\n\n

        \u201cThe gateway to reach 2.2.2.0\/24 is 1.1.1.2\u201d<\/p>\n\n\n\n

        So here, gateway and next hop are the same thing<\/strong> \u2014 the IP of the next router.<\/p>\n\n\n\n

        3. Gateway configured on a PC<\/strong><\/p>\n\n\n\n

        When you assign an IP address to a PC, you usually also configure a default gateway<\/strong>.<\/p>\n\n\n\n

        For example:<\/p>\n\n\n\n

          \n
        • IP address = 1.2.3.1\/24<\/li>\n\n\n\n
        • Gateway = 1.2.3.100<\/li>\n<\/ul>\n\n\n\n

          Here, the gateway is the IP of the router interface that the PC will use to send packets outside its own subnet<\/strong>.<\/p>\n\n\n\n

          Internally, when you set a gateway like this, the system automatically adds a default route<\/strong> in the PC\u2019s routing table:<\/p>\n\n\n\n

          0.0.0.0\/0\u00a0\u00a0 via 1.2.3.100<\/p>\n\n\n\n

          This default route means \u2014 \u201csend any packet that doesn\u2019t match a more specific route to 1.2.3.100.\u201d<\/p>\n\n\n\n

          So in this context, gateway is the next hop for the default route<\/strong>.<\/p>\n\n\n\n

          \n\n\n\n

          Summary<\/strong><\/p>\n\n\n\n

            \n
          • Next Hop<\/strong> \u2192 IP address of the next router (on the same subnet) to send the packet to.<\/li>\n\n\n\n
          • Exit Interface<\/strong> \u2192 The interface through which the packet should be sent.<\/li>\n\n\n\n
          • Metric<\/strong> \u2192 Used to pick the best path when multiple routes exist.<\/li>\n\n\n\n
          • Gateway<\/strong> \u2192 Can mean a router, the next hop IP, or the default router used by a PC.<\/li>\n<\/ul>\n\n\n\n
            \n<\/body>","protected":false},"excerpt":{"rendered":"

            Next Hop, Exit Interface and Metric \u2013 Fields in a Routing Table In the previous tutorial, we discussed how network addresses are used in the routing table. In this one, we\u2019ll look into a few more fields you\u2019ll commonly see in a routing table \u2013 like Next Hop, Exit Interface, and Metric. If you haven\u2019t […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"wp-custom-template-post-with-sidebar2","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[330],"tags":[],"class_list":["post-1265","post","type-post","status-publish","format-standard","hentry","category-networking-fundamentals"],"yoast_head":"\nRouting Table Fields Explained: Next Hop, Exit Interface, Metric, and Gateway - Tutorials<\/title>\n<meta name=\"description\" content=\"Learn how routing decisions are made using fields like next hop, exit interface, metric, and gateway. 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