[GH-ISSUE #1624] Software not supported for /31 networks #1088

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opened 2026-05-05 07:26:15 -06:00 by gitea-mirror · 1 comment

gitea-mirror commented

2026-05-05 07:26:15 -06:00

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Originally created by @tonsimple on GitHub (Oct 28, 2017).
Original GitHub issue: https://github.com/netblue30/firejail/issues/1624

Tried to use firejail and bring in eth0 using --net=eth0
Got the error in the title.

Any pointers on what to do to work around this?

Originally created by @tonsimple on GitHub (Oct 28, 2017). Original GitHub issue: https://github.com/netblue30/firejail/issues/1624 Tried to use firejail and bring in eth0 using --net=eth0 Got the error in the title. Any pointers on what to do to work around this?

gitea-mirror

2026-05-05 07:26:15 -06:00

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gitea-mirror commented

2026-05-05 07:26:19 -06:00

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@SkewedZeppelin commented on GitHub (Oct 28, 2017):

/31 is a point-to-point network. Firejail requires at least a /30. Using --net checks the ARP table to see what addresses are already in use and then tries to assign an address to itself. But in /31 there are only able to be 2 addresses, one that your computer is already using and one in use by the router itself.

A potential workaround could be this https://github.com/netblue30/firejail/issues/1600#issuecomment-335847527

@SkewedZeppelin commented on GitHub (Oct 28, 2017): /31 is a point-to-point network. Firejail requires at least a /30. Using --net checks the ARP table to see what addresses are already in use and then tries to assign an address to itself. But in /31 there are only able to be 2 addresses, one that your computer is already using and one in use by the router itself. A potential workaround could be this https://github.com/netblue30/firejail/issues/1600#issuecomment-335847527

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Reference: github-starred/firejail#1088

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