Is it defined for packets or for frames? I'm finding conflicting definitions on google. The book says that the MTU is the "length of the largest link-layer frame that can be sent by the local sending host"-- hence my confusion since we're not provided any link layer header info. But, if I understand what you've said earlier, we're to assume it's strictly going to only have IP header anyway.
<br><br><div><span class="gmail_quote">On 9/20/07, <b class="gmail_sendername">Jorge Ortiz</b> <<a href="mailto:jortiz@cs.berkeley.edu">jortiz@cs.berkeley.edu</a>> wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
The MTU is the largest sized packet that can be passed. This includes<br>header information.<br><br><br>On 9/20/07, Nescio Nomen <<a href="mailto:nescionomen@gmail.com">nescionomen@gmail.com</a>> wrote:<br>> Oh wait, I think I understand-- you're saying that MTU does not include the
<br>> link header size?<br>><br>><br>> On 9/20/07, Nescio Nomen < <a href="mailto:nescionomen@gmail.com">nescionomen@gmail.com</a>> wrote:<br>> > I'm not sure I understand. (in a real life problem) why wouldn't we need
<br>> to know the size of the frame header just because we are given the MTU?<br>> Wouldn't we try to find the amount of 'real data' that could fit by doing<br>> something along the lines of MTU - frame header size - IP header size -
<br>> Layer 4 header size?<br>> ><br>> ><br>> ><br>> > On 9/20/07, Jonathan D. Ellithorpe < <a href="mailto:jde@berkeley.edu">jde@berkeley.edu</a>> wrote:<br>> > > I think the MTU is actually defined as being the maximum amount of data
<br>> > > that a link layer frame can encapsulate. Thus, we don't need to consider<br>> > > the size of the frame, since we're just given the MTU of the link-layer.<br>> > ><br>> > >
<br>> > > Jorge Ortiz wrote:<br>> > > > On 9/20/07, Nescio Nomen <<a href="mailto:nescionomen@gmail.com">nescionomen@gmail.com</a>> wrote:<br>> > > ><br>> > > >> For hmwk Problem #2, P16, do we know if the datagram will have a TCP
<br>> header<br>> > > >> inside? (Is it necessarily the case that a datagram always<br>> encapsulated a<br>> > > >> TCP header?)<br>> > > >><br>> > > ><br>> > > > If it's specified as only being a plane datagram (as it is in the
<br>> > > > problem), we only need to include the IP header.<br>> > > ><br>> > > ><br>> > > >> Also, when we are transmitting into the link, how big is the<br>> > > >> frame header?
<br>> > > >><br>> > > ><br>> > > > Treat the packet as having only an IP header and the data you wish to<br>> send.<br>> > > ><br>> > > ><br>> > > >> We haven't really talked about this layer yet. Does the size
<br>> > > >> of the frame header depend on the technology, i.e. optical?<br>> > > >><br>> > > ><br>> > > > It may, yes. Different mediums may have different header definitions.
<br>> > > ><br>> > > > jorge<br>> > > ><br>> > > ><br>> > > >> _______________________________________________<br>> > > >> ee122 mailing list<br>
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