Date: Thu, 5 May 2016 02:45:01 +0700 From: Eugene Grosbein <eugen@grosbein.net> To: 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: <572A513D.5080904@grosbein.net> In-Reply-To: <BLU172-W2076011C8CC090218DCD6EB57B0@phx.gbl> References: <BLU172-W2076011C8CC090218DCD6EB57B0@phx.gbl>
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05.05.2016 2:33, Wayne H пишет: > 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 soon as I try to write to it the NFS hangs. If I umount and reset the MTU 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.
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