From owner-freebsd-net@freebsd.org Wed May 4 19:33:57 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 862B3B2D625 for ; Wed, 4 May 2016 19:33:57 +0000 (UTC) (envelope-from testdog@hotmail.com) Received: from BLU004-OMC2S26.hotmail.com (blu004-omc2s26.hotmail.com [65.55.111.101]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (Client CN "*.outlook.com", Issuer "Microsoft IT SSL SHA2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 450721F89 for ; Wed, 4 May 2016 19:33:56 +0000 (UTC) (envelope-from testdog@hotmail.com) Received: from BLU172-W20 ([65.55.111.72]) by BLU004-OMC2S26.hotmail.com over TLS secured channel with Microsoft SMTPSVC(7.5.7601.23008); Wed, 4 May 2016 12:33:50 -0700 X-TMN: [GJrQ88FqMFXBprwigf7+PkSq/AgtsY8C] X-Originating-Email: [testdog@hotmail.com] Message-ID: From: Wayne H To: "freebsd-net@freebsd.org" Subject: Not able to raise the MTU on FreeBSD 10.3 Date: Wed, 4 May 2016 19:33:50 +0000 Importance: Normal MIME-Version: 1.0 X-OriginalArrivalTime: 04 May 2016 19:33:50.0808 (UTC) FILETIME=[E2C1AD80:01D1A63B] Content-Type: text/plain; charset="iso-8859-1" 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 19:33:57 -0000 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 as soo= n as I try to write to it the NFS hangs. If I umount and reset the MTU to 1= 500 it works fine. Anyone know what I am doing wrong? root@backgate1:/usr/home/wayne # ping -D -s 1472 10.168.48.145 PING 10.168.48.145 (10.168.48.145): 1472 data bytes 1480 bytes from 10.168.48.145: icmp_seq=3D0 ttl=3D64 time=3D0.111 ms 1480 bytes from 10.168.48.145: icmp_seq=3D1 ttl=3D64 time=3D0.059 ms ^C --- 10.168.48.145 ping statistics --- 2 packets transmitted=2C 2 packets received=2C 0.0% packet loss round-trip min/avg/max/stddev =3D 0.059/0.085/0.111/0.026 ms root@backgate1:/usr/home/wayne # ping -D -s 1473 10.168.48.145 PING 10.168.48.145 (10.168.48.145): 1473 data bytes ping: sendto: Message too long ping: sendto: Message too long ^C --- 10.168.48.145 ping statistics --- 2 packets transmitted=2C 0 packets received=2C 100.0% packet loss FreeBSD 10.3-RELEASE #0 r297264: Fri Mar 25 02:10:02 UTC 2016 root@rele= ng1.nyi.freebsd.org:/usr/obj/usr/src/sys/GENERIC Intel(R) Ethernet Connection XL710 Driver=2C Version - 1.4.3 ixl0@pci0:5:0:0: class=3D0x020000 card=3D0x00078086 chip=3D0x1572808= 6 rev=3D0x01 hdr=3D0x00 vendor =3D 'Intel Corporation' device =3D 'Ethernet Controller X710 for 10GbE SFP+' class =3D network ntel(R) PRO/1000 Network Connection=2C Version - 2.5.3-k =20 igb0@pci0:11:0:0: class=3D0x020000 card=3D0x152115d9 chip=3D0x1521808= 6 rev=3D0x01 hdr=3D0x00 vendor =3D 'Intel Corporation' device =3D 'I350 Gigabit Network Connection' class =3D network ixl0: flags=3D8843 metric 0= mtu 9000 options=3D6407bb ether 3c:fd:fe:9d:5c:24 inet 10.168.48.144 netmask 0xffffff00 broadcast 10.168.48.255 nd6 options=3D29 media: Ethernet autoselect (10Gbase-Twinax ) status: active igb0: flags=3D8843 metric 0= mtu 9000 options=3D403bb ether 0c:c4:7a:32:f0:51 inet 172.16.48.244 netmask 0xffffff00 broadcast 172.16.48.255 nd6 options=3D29 media: Ethernet autoselect (1000baseT ) status: active Thanks =