Date: Wed, 4 May 2016 12:53:00 -0700 From: Freddie Cash <fjwcash@gmail.com> To: Eugene Grosbein <eugen@grosbein.net> Cc: Wayne H <testdog@hotmail.com>, "freebsd-net@freebsd.org" <freebsd-net@freebsd.org> Subject: Re: Not able to raise the MTU on FreeBSD 10.3 Message-ID: <CAOjFWZ7hhjaWfWngG=Uc=yOrwCLPPaY59mq-pH5FOCOUCud7vg@mail.gmail.com> In-Reply-To: <572A513D.5080904@grosbein.net> References: <BLU172-W2076011C8CC090218DCD6EB57B0@phx.gbl> <572A513D.5080904@grosbein.net>
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On Wed, May 4, 2016 at 12:45 PM, Eugene Grosbein <eugen@grosbein.net> 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
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