Date: Fri, 27 Sep 1996 09:30:26 -0700 From: Amancio Hasty <hasty@rah.star-gate.com> To: Rohit Dube <rohit@cs.UMD.EDU> Cc: dg@Root.COM, freebsd-hackers@FreeBSD.ORG Subject: Re: Giant Sized Ethernet Packets Message-ID: <199609271630.JAA04483@rah.star-gate.com> In-Reply-To: Your message of "Fri, 27 Sep 1996 08:59:16 EDT." <199609271259.IAA11945@darling.cs.UMD.EDU>
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Before I start hacking... Well, you will be non-conformant and some equipment will not work. You have to experiment a little and find out what works. In our case, we had a business reason for trying it out . I personally had good success with UTP machine to machine;however, the project call for thin net. I am sure that Julian can fill in more about TRW's net configuration . Given that you need a modest increase on the size of the packets, all what you need is to enable the BIG PACKET option in the driver and increase the mtu size. My suggestion is to first try two FreeBSD boxes directly connected with UTP to verify that indeed that the big packets works. Amancio >From The Desk Of Rohit Dube : > On Wed, 18 Sep 1996 20:50:52 -0700 dg@root.com writes: > =>I just spent about 15 minutes looking over the DC21140 hardware reference > =>manual. It appears that the chip can except larger frames, but it signals > =>an error condition when this occurs, so I don't think you could do this > =>as a normal mode of operation. It also appears that it is possible to > =>generate larger than 1500 byte packets, but the frames wouldn't be ethernet > =>(the type/length field would not be IEEE 802.3) and you'd have to invent yo ur > =>own encapsulation. ...that's how I read it, anyway. Perhaps Matt Thomas wil l > =>correct me on this. > => > =>-DG > => > =>David Greenman > =>Core-team/Principal Architect, The FreeBSD Project > > Another quick question before I start hacking : DO hubs have a problem > with 1500+ bytes packet. I am using an Asante 100BaseTX hub to hook up > my FreeBSD machines. If the hub is intelligent and drops packets greater > than 1500 bytes in size, then I would be in trouble even before I start. > > Julian/Amancio : care to share you configuartion? > > Thanks. > > --rohit. > >
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