7b7a569c   
   From: grahn+nntp@snipabacken.se   
      
   On Tue, 2012-04-24, Madhur wrote:   
   > Hi,   
   >   
   >     I am having a setup as given below   
   >   
   >   
   > (TCP client)Mobile ---[Wireless]----Station 1---[ethernet]-----   
   > Station2---[ethernet]----Station 3(TCP Server)   
   >   
   > TCP client is pulling data from TCP server. When I am trying to do   
   > this I Observe TCP payload size between at Station 2 I observe data   
      
   I guess "between at Station 2" means "to the right of 2"?   
      
   > packet sizes in multiples of MTU sizes like, 3000, 4500, 6000,...   
      
   What does this mean? The MTU is the max size of the Ethernet data, and   
   you seem to say MTU is 1500 on those links. So are you saying you see   
   up to four IP fragments for each IP datagram? That seems crazy.   
      
   > The   
   > application/forwarding agent at Station 2   
      
   Uh, what's an "application/forwarding agent"? Isn't it just a router   
   you have there?   
      
   > expects packets of size 1500   
   > or less only. Hence packets are dropped at Station 2. After 300ms, TCP   
   > is retransmitting packets with smaller packet size(<1500) and hence it   
   > reaches TCP Client. Eventually i observe poor throughput.   
   >   
   > I am very greatful if someone points to me, as why I am finding packet   
   > sizes more than 1500 bytes at station 2. I have tried setting TCP MSS   
   > at TCP server. MTU sizes on interfaces are 1500. The negotiated MSS is   
   > less than 1500. I am clueless.   
      
   I kind of suspect you're describing a path where MTU is small S1--S2,   
   but you have jumbo frames S2--S3 ... but that is just a guess, and if   
   it's a correct guess I don't understand why you didn't simply say so.   
      
   /Jorgen   
      
   --   
     // Jorgen Grahn    O  o   .   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)