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Date:      Thu, 11 Jun 2026 01:00:35 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 295986] bge: for vnet jails, ifconfig -txcsum is required
Message-ID:  <bug-295986-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=295986

            Bug ID: 295986
           Summary: bge: for vnet jails, ifconfig -txcsum is required
           Product: Base System
           Version: 14.3-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: dvl@FreeBSD.org

In order for DNS to work in a vnet jail, `ifconfig -txcsum` is required

Background:
https://forums.freebsd.org/threads/broadcom-nic-leads-to-vnet-jails-being-unable-to-make-dns-requests.101534/

The URL contains my jail configuration. I apologize: I have not yet tried to
create a simpler test case.

If the jail uses unbound on the host for DNS, DNS works.

If the jail uses an off-host solution (e.g. my gateway), DNS does not work.

When configured to use off-host DNS, and it is failing, the following change to
the cloned NIC allows DNS to work:

`sudo ifconfig epair47a -txcsum`

I'm happy to create a more simple solution and test. The host is question is
not used for anything else at the moment.

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