254849
Description
IPv4 Routing
- Host Routing
- Step 1. If the destination IP address is in the same IP subnet
as I am, send the packet directly to that destination host.
- Step 2. Otherwise, send the packet to my default gateway, also known as a default router.
- Step 1. If the destination IP address is in the same IP subnet
as I am, send the packet directly to that destination host.
- Router Forwarding Logic
- Step 1. Use the data link Frame Check Sequence (FCS)
field to ensure that the frame had no errors; if errors
occurred, discard the frame.
- Step 2. Assuming that the frame was not discarded at Step 1, discard
the old data link header and trailer, leaving the IP packet.
- Step 3. Compare the IP packet’s destination IP address to the routing table, and find the
route that best matches the destination address.
- Step 4. Encapsulate the IP packet inside a new data link header and trailer, appropriate for the outgoing
interface, and forward the frame.
- Step 4. Encapsulate the IP packet inside a new data link header and trailer, appropriate for the outgoing
interface, and forward the frame.
- Step 3. Compare the IP packet’s destination IP address to the routing table, and find the
route that best matches the destination address.
- Step 2. Assuming that the frame was not discarded at Step 1, discard
the old data link header and trailer, leaving the IP packet.
- Step 1. Use the data link Frame Check Sequence (FCS)
field to ensure that the frame had no errors; if errors
occurred, discard the frame.
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