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RFC Number:		Errata ID:
Source of RFC		Status:	All/Any Verified+Reported Verified Reported Held for Document Update Rejected
Area Acronym:	All/Any app art gen int ops rai rtg sec tsv wit	Type:	All/Any Editorial Technical
WG Acronym:		Submitter Name:
Other:	All/Any IAB INDEPENDENT IRTF Legacy Editorial	Date Submitted:
Summary Table Full Records

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

Source of RFC: Legacy
Area Assignment: int
See Also: RFC 1180 w/ inline errata

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Errata ID: 5074
Status: Verified
Type: Technical
Publication Format(s) : TEXT
Reported By: Erik Auerswald
Date Reported: 2017-07-29
Verifier Name: Éric Vyncke
Date Verified: 2024-01-12

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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