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RFC 1180, "TCP/IP tutorial", January 1991

Source of RFC: Legacy
Area Assignment: int

Errata ID: 5074

Status: Reported
Type: Technical

Reported By: Erik Auerswald
Date Reported: 2017-07-29

Section 5.3 says:

When an incoming IP packet arrives it is never forwarded back out
through the same network interface.

It should say:

When an incoming IP packet arrives it may be forwarded back out
through the same network interface.

Notes:

IP routers can and do send IP packets out the ingress interface. An ICMP redirect message may be sent in this case.

This is different to Ethernet bridge behavior, where a frame will not be sent out the ingress interface.

An IP packet that egresses the ingress interface is carried in a new Ethernet frame, this is not the same frame that arrived at the ingress interface (different SRC and DST MAC addresses, decreased TTL in the IP header).

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