6.2 mtu now limits size of incomming packet

[Stephen Clark]

Artyom Viklenko wrote:

>Artem Belevich wrote:
>  
>
>>Here's one example where MTU!=MRU would be useful.
>>
>>Think of asymmetric bandwith-limited ADSL links. Lower MTU would allow
>>lower TX latency for high priority packets when upstream is saturated,
>>yet large MRU on the downstream would be great for downloads.
>>
>>Right now with 6.2 one has to trade off lower latency  for faster download.
>>
>>--Artem
>>    
>>
>
>You can prioritize small packets with ACKs, for example, by other
>techniques - ALTQ one of them.
>Unconditional lovering MTU even on ADSL tend to loss throughtput.
>
>And let's think about TCP MSS. When TCP connection establishes,
>TCP stack uses MTU as measure to choose MSS.
>
>Any two hosts, connected to single Layer2 network MUST use
>same MTU. Any other cases lead to hard-to-solve problems.
>
>This is all IMHO. But I would not like to see different
>MTU and MRU on my Ethernet interfaces! :)
>
>  
>
Yes but the mss is what the endpoints in the connection know about their 
own mtu's,
at this point there is no knowledge of the mtu/mru's of intermediate 
routers.

Steve

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