From owner-freebsd-net@freebsd.org Wed May 4 19:53:01 2016 Return-Path: Delivered-To: freebsd-net@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 4C81FB2DA9D for ; Wed, 4 May 2016 19:53:01 +0000 (UTC) (envelope-from fjwcash@gmail.com) Received: from mail-io0-x232.google.com (mail-io0-x232.google.com [IPv6:2607:f8b0:4001:c06::232]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 1D1BF1A9E for ; Wed, 4 May 2016 19:53:01 +0000 (UTC) (envelope-from fjwcash@gmail.com) Received: by mail-io0-x232.google.com with SMTP id d62so65165274iof.2 for ; Wed, 04 May 2016 12:53:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc; bh=bIhlpQ2CprzI/9EWE4nEkYzNemhT62nOgUY0PZa+L0o=; b=Y6YHZOQZgNIKkhbLeAv880AEiByexy7vNUcZ03JqKliyV3iyKmU+BHovu4k91dH8Ld wB2oeidSW4PSNw1SpA79xBW3mNBnWW31vgCuCiBlwb26RQR6Dje6D0HVBvhxA6wdOAyH zY/ucZYq09ZXQ4JckLPsFKYu5jauIXialGISJJg7asnVFQEwkRqZPOW3r3xmT8+lpSo7 l9a3vtrIKhiPYyjuusFZCG3zlpE5Fw1Ky/lFK6L1FaoNzZFZxJ2Upqc0oeaR3fKlCvAB uHFZ4gxiemE22EO4HkPtIoMjStcZqasZI/QddBQcp/8B8kkqZmwvOR8B5i8FQ1wkPECR sfbA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc; bh=bIhlpQ2CprzI/9EWE4nEkYzNemhT62nOgUY0PZa+L0o=; b=hv6BkMasor2JObBMoTmhpWRymsK/xJluu9p6NG/KcfYJsd6p6p0gCmJXugdzwnMnCZ enJFmulehvygNtTVYu9Tyupp51H7K1ZC9VdDC0OnAHXMb5PT8j2EzJxCiRHVTJZqQf2B v51mVph74dUU5VzJ6m5FkFhVPNT4762pKvLgMntqpAj/k6q/pfv7nuIvXFPRh5vmjc1n Lnzbh8mF7f3i5kB7OdDJAGWHJniwxwwnIlqYH5JIyeShUfDRPvExpvkzQ5blFLJxE1+d 0tiMzPxdvPYWTOz0Z78y91Zbgod/LXCzXIWOgLvkrwEI9gVyEmFFWBnRhTYb2nQX8LST KCUQ== X-Gm-Message-State: AOPr4FUJcxhuOSTdD/yu9ILLGq+yPMdkStnmJs4ta7TkcUs79EMI2HQO1nrVneLUQgkPV3NOPtPOer0sD75zRA== MIME-Version: 1.0 X-Received: by 10.107.134.24 with SMTP id i24mr12778416iod.130.1462391580593; Wed, 04 May 2016 12:53:00 -0700 (PDT) Received: by 10.107.161.6 with HTTP; Wed, 4 May 2016 12:53:00 -0700 (PDT) In-Reply-To: <572A513D.5080904@grosbein.net> References: <572A513D.5080904@grosbein.net> Date: Wed, 4 May 2016 12:53:00 -0700 Message-ID: Subject: Re: Not able to raise the MTU on FreeBSD 10.3 From: Freddie Cash To: Eugene Grosbein Cc: Wayne H , "freebsd-net@freebsd.org" Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Content-Filtered-By: Mailman/MimeDel 2.1.22 X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 04 May 2016 19:53:01 -0000 On Wed, May 4, 2016 at 12:45 PM, Eugene Grosbein wrote= : > 05.05.2016 2:33, Wayne H =D0=BF=D0=B8=D1=88=D0=B5=D1=82: > >> I have two new servers connected together with 10 gig Intel and 1 gig >> Nic cards. It doesn't matter if I have them connected via a switch or >> directly connected to each other. I am unable to pass ping packets above >> 1472. If I set the MTU to anything up to 9000 I till can't pass anything >> above 1472. I have the 10 gig connected via an Intel SFP+ Cable between = the >> servers. I also tried connecting the 1 gig Nics between the servers. >> >> I would like to use jumbo frames to mount these servers to a NFS server. >> If I set the MTU to 9000 in rc.conf on boot up I can mount the NFS but a= s >> soon as I try to write to it the NFS hangs. If I umount and reset the MT= U >> to 1500 it works fine. >> >> Anyone know what I am doing wrong? >> > > First increase MTU, then assign IP address. > Or delete it and reassign after increase of MTU to recreate "interface > route" having its own MTU > inherited by interface MTU. This MTU of the "interface route" limits you > and it is not changed > automatically with interface MTU in your version of FreeBSD. > =E2=80=8BYou can also manually delete and re-add the route with the -mtu op= tion, if you don't want to drop/add the IP.=E2=80=8B --=20 Freddie Cash fjwcash@gmail.com