Jumbo frame Question

Adrian Chadd adrian at creative.net.au
Thu Nov 25 18:19:27 CST 2010


TCP maximum window sizes.

Application socket buffer sizes.

Fix those and re-test!



Adrian

On Fri, Nov 26, 2010, Harris Hui wrote:
> 
> 
> Hi
> 
> Does anyone have experience on design / implementing the Jumbo frame
> enabled network?
> 
> I am working on a project to better utilize a fiber link across east coast
> and west coast with the Juniper devices.
> 
> Based on the default TCP windows in Linux / Windows and the latency between
> east coast and west coast (~80ms) and the default MTU size 1500, the
> maximum throughput of a single TCP session is around ~3Mbps but it is too
> slow for us to backing-up the huge amount of data across 2 sites.
> 
> The following is the topology that we are using right now.
> 
> Host A NIC (MTU 9000) <--- GigLAN ---> (MTU 9216) Juniper EX4200 (MTU 9216)
> <---GigLAN ---> (MTU 9018) J-6350 cluster A (MTU 9018) <--- fiber link
> across site ---> (MTU 9018) J-6350 cluster B (MTU 9018) <--- GigLAN --->
> (MTU 9216) Juniper EX4200 (MTU 9216) <---GigLAN ---> (MTU 9000) NIC - Host
> B
> 
> I was trying to test the connectivity from Host A to the J-6350 cluster A
> by using ICMP-Ping with size 8000 and DF bit set but it was failed to ping.
> 
> Does anyone have experience on it? please advise.
> 
> Thanks :-)
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