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From: Chris Ross <cross+freebsd@distal.com>
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Subject: Re: IPv6 networking problems in 14.3
Date: Mon, 15 Sep 2025 13:20:16 -0400
In-Reply-To: <092f8b7a-9b98-4e2a-b6c5-361b40549cce@denninger.net>
Cc: freebsd-net@freebsd.org, Roy Marples <roy@marples.name>
To: Karl Denninger <karl@denninger.net>
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> On Sep 15, 2025, at 08:59, Karl Denninger <karl@denninger.net> wrote:
>=20
> Hmmmmm.... just came in via git pull:
>=20
>     dhclient: improve UDP checksum handling
>=20
> This could potentially apply to other bpf-using things -- which =
includes dhcpcd.  And you have tso/lro turned on.
>=20
> It is a patch to dhclient, not dhcpcd but does the same issue =
potentially apply?
>=20

I don=E2=80=99t know, but I think that isn=E2=80=99t my problem.  It =
seems like the NS that
dhcpcd is sending is alright, and tcpdump doesn=E2=80=99t see an NA =
coming
back in at all.

- Chris


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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"overflow-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;"><br =
id=3D"lineBreakAtBeginningOfMessage"><div><br><blockquote =
type=3D"cite"><div>On Sep 15, 2025, at 08:59, Karl Denninger =
&lt;karl@denninger.net&gt; wrote:</div><br =
class=3D"Apple-interchange-newline"><div>

 =20
    <meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3DUTF-8">
 =20
  <div><p>Hmmmmm.... just came in via git pull:</p><p>&nbsp; &nbsp; =
dhclient: improve UDP checksum handling<br>
      <br>This could potentially apply to other bpf-using things -- =
which
      includes dhcpcd.&nbsp; And you have tso/lro turned on.</p><p>It is =
a patch to dhclient, not dhcpcd but does the same issue
      potentially apply?</p></div></div></blockquote><div><br></div>I =
don=E2=80=99t know, but I think that isn=E2=80=99t my problem. &nbsp;It =
seems like the NS that</div><div>dhcpcd is sending is alright, and =
tcpdump doesn=E2=80=99t see an NA coming</div><div>back in at =
all.</div><div><br></div><div>- Chris</div><div><br></div></body></html>=

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