Date: Mon, 22 Sep 1997 07:31:55 -0700 From: David Greenman <dg@root.com> To: Joe Beiter <jwb@xioa.cosmic.org> Cc: questions@FreeBSD.ORG Subject: Re: SLIP and MTU Message-ID: <199709221431.HAA25993@implode.root.com> In-Reply-To: Your message of "Mon, 22 Sep 1997 09:23:06 EDT." <199709221323.JAA02814@xioa.cosmic.org>
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>I began tracking a problem with sendmail getting "collect: I/O error blah blah" >The sendmail FAQ cited MTU incompatibilities between myself and my ISP. My >ISP told me my mtu should be set to 1536, which I set on my dip command line. > >However, when I do an "ifconfig sl0", it says my mtu is 552 and will not >let me manually set it to 1536 from the command line claiming it is an >illegal argument. > >Can anyone enlighten me on what is happening here? > >p.s. Don't bother telling me to use PPP. The version of code on the Bay >routers my ISP is using does not like FreeBSD's PPP. Neither Bay nor the >FreeBSD development group are concerned so that is why I'm stuck using slip. The maximum is 1500, so use that. That's a better value anyway since it's also the ethernet MTU, which is often the limiting factor in the Internet. -DG David Greenman Core-team/Principal Architect, The FreeBSD Project
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