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Summary

Description Schematic for the packet flow paths through Linux networking and Xtables
Date last updated 2019-May-19
Source Own work, Origin SVG PNG
Author Jan Engelhardt
SVG development
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Captions

The path traversed by a data packet in a traditional TCP/IP computer network is influenced by a number of routing and filtering steps.

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File history

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(newest | oldest) View (newer 10 | ) (10 | 20 | 50 | 100 | 250 | 500)
Date/TimeThumbnailDimensionsUserComment
current13:54, 21 April 2021Thumbnail for version as of 13:54, 21 April 20211,650 × 525 (106 KB)XavifrMoved Re-route checking based on info from https://www.frozentux.net/iptables-tutorial/chunkyhtml/c962.html
00:18, 4 December 2020Thumbnail for version as of 00:18, 4 December 20201,650 × 525 (105 KB)EditordepapaFixed SVG document size
00:12, 4 December 2020Thumbnail for version as of 00:12, 4 December 20201,650 × 675 (105 KB)EditordepapaAdded the NAT input chain
04:17, 27 June 2020Thumbnail for version as of 04:17, 27 June 20201,650 × 475 (84 KB)WokesterChange XDP_ACCEPT to XDP_PASS according to https://prototype-kernel.readthedocs.io/en/latest/networking/XDP/implementation/xdp_actions.html
17:37, 28 September 2019Thumbnail for version as of 17:37, 28 September 20191,650 × 475 (102 KB)AYDanilovReroute check of local-originated packets occurs after the OUTPUT hook.
14:54, 14 May 2019Thumbnail for version as of 14:54, 14 May 20191,650 × 475 (102 KB)TeknoraverAdded XDP in the flow
02:15, 28 February 2014Thumbnail for version as of 02:15, 28 February 20141,450 × 475 (95 KB)JengelhNF permit hooking at any point. The image merely shows the basic/principial set of well-known filtering opportunities, and not every possible action.
01:16, 10 October 2013Thumbnail for version as of 01:16, 10 October 20131,450 × 475 (95 KB)IlyaBobyrPacket is actually rerouted after any changes in the nat.OUTPUT change. I assume, filter.OUTPUT is also happening before the "reroute check". It makes sense, at least for nat.OUTPUT - if you nat your packet and change its destination IP, normally, you...
00:41, 12 November 2012Thumbnail for version as of 00:41, 12 November 20121,450 × 475 (95 KB)JengelhWikipedia's SVG->PNG converter fails to support path-following text, therefore replace it by normal text.
00:37, 12 November 2012Thumbnail for version as of 00:37, 12 November 20121,450 × 475 (94 KB)JengelhAdded AF_PACKET socket (used by e.g. tcpdump/iptraf-ng/dhcpd)
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