ELI5 Inbound vs Outbound FW rules? Are they the same with SRC and DST swapped?

This post has been de-listed

It is no longer included in search results and normal feeds (front page, hot posts, subreddit posts, etc). It remains visible only via the author's post history.

Post Flair (click to view more posts with a particular flair)

Concepts

Post Body

Sometimes I see FW rules that are INBOUND and some are OUTBOUND. I'm not able to understand the difference.

Wouldn't INBOUND and OUTBOUND just be the same thing with the SRC and DST swapped?

For example, take these rules:

OUTBOUND: Allow device on VLAN 10 to send traffic from SRC port to DEST port on any client in VLAN 20
INBOUND: Allow device on VLAN 10 to send traffic from SRC port to DEST port on any client in VLAN 20

What is the difference in the two? What does one being OUTBOUND and the other being INBOUND mean?

Author

Account Strength

100%

Account Age

13 years

Verified Email

Yes

Verified Flair

Total Karma

9,948

Link Karma

4,007

Comment Karma

1,206

Profile updated: 14 hours ago

imthenachoman

Subreddit

r/AskNetsec

Post Details

We try to extract some basic information from the post title. This is not always successful or accurate, please use your best judgement and compare these values to the post title and body for confirmation.

Posted: 1 year ago
Reddit URL: View post on reddit.com
External URL: reddit.com/r/AskNetsec/c...