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b=ACn/oeGOS3Za3z9xeOU8bbuMqRV2RUHmvVAgflO1TFUbHqR68KDxKjKJCWfK36mHc Qsn5Pk4ByMfrHQJy86nr5fxtrucuYKIKNWDa4QyjfYXxpAmUF1Jo5uxEefKt0Yocmi AzIyHHPco2V67UD1BtDGLFmGDmTcbFn4xETmpsqOF3poi/UZVbZFdhwisq4bAmL563 rcJn2Ge9w41L/5UobcE5Lt6SmZksoEzhMT2fZmcdBNOpL3fOhjUQAlm0PTr+/5zdJp ea9uPV0RGX7z9uUe+vXI1atGScrTPtKiSkApgR0BGeGoo0AMtj/er1YDBR1m+i/YPw 8tXgr37YttyiQ== Date: Tue, 12 Dec 2023 19:30:24 +0000 To: "b.a.t.m.a.n@lists.open-mesh.org" From: Rich Chase Subject: Re: bat0 not capable of MTU > 1500 Message-ID: In-Reply-To: References: Feedback-ID: 93688764:user:proton MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Message-ID-Hash: CDQ6VNSQYPA3KT52Q2TOGLNYRA6T2FFN X-Message-ID-Hash: CDQ6VNSQYPA3KT52Q2TOGLNYRA6T2FFN X-MailFrom: rchase47@proton.me X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; header-match-b.a.t.m.a.n.lists.open-mesh.org-0; header-match-b.a.t.m.a.n.lists.open-mesh.org-1; header-match-b.a.t.m.a.n.lists.open-mesh.org-2; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header X-Mailman-Version: 3.3.8 Precedence: list List-Id: The list for a Better Approach To Mobile Ad-hoc Networking Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: I am trying to create an unimpeded path MTU of 1500 on my OpenWRT router (B= elkin RT-3200). I built the firmware from git Master, with kernel version 6= .1, and batman-adv version 2023.2. I have a batmesh hard-if device mastering an 802.1S mesh, which are both se= t to MTU=3D2304. Using Luci (OpenWRT web gui for uci), I set the MTU of bat0 to 1504 to acco= mmodate .1q vlans on bat0 -- bat0.5, bat0.110, etc. I see in the system log: =C2=A0 =C2=A0 kern.err kernel: [751585.375855] bat0: mtu greater than devic= e maximum Also, if I do: =C2=A0 =C2=A0 #> ip link set bat0 mtu 1504 I get: =C2=A0 =C2=A0 ip: SIOCSIFMTU: Invalid argument and if I test: =C2=A0 =C2=A0 #> ip link show bat0 ...it says that my mtu is 1500 still. For my life I can't see anything I'm doing wrong. Why can't bat0 have MTU greater than 1500? I don't have any other devices mastered by bat0, other than my .1s wifi mes= h link. Throwing myself at your mercy. Help?