[Sis-SCPS-INTEREST] checksum errors

[Feighery, Patrick D.]

Unfortunately, the Realtek drivers probably have a bug in them that is
only tickled by the way rate control emits packets, which is not
tickled with 'typical internet traffic flow'

Thanks for the posting.

	Pat

>>-----Original Message-----
>>From: sis-scps-interest-bounces at mailman.ccsds.org 
>>[mailto:sis-scps-interest-bounces at mailman.ccsds.org] On 
>>Behalf Of Jayasri Sangu
>>Sent: Friday, June 30, 2006 2:49 PM
>>To: sis-scps-interest at mailman.ccsds.org
>>Subject: RE: [Sis-SCPS-INTEREST] checksum errors
>>
>>Hi All,
>>
>>    Finally I got rid of the checksum errors by swapping the 
>>Realtek(RTL8169S) network cards with Intel network cards.
>>
>>     Without scps gateway, Realtek works fine. But with the 
>>presence of scps gateway it gives checksum errors.
>>
>>Thanks
>>Jayasri
>>
>>    
>>
>>-----Original Message-----
>>From: sis-scps-interest-bounces at mailman.ccsds.org
>>[mailto:sis-scps-interest-bounces at mailman.ccsds.org]On Behalf 
>>Of Jayasri
>>Sangu
>>Sent: Thursday, June 22, 2006 12:01 PM
>>To: sis-scps-interest at mailman.ccsds.org
>>Subject: [Sis-SCPS-INTEREST] checksum errors
>>
>>
>>Hi All,
>>
>>    I have a network setup with 5 machines
>>
>>   A-------- B -------- C ------D --------E
>> 
>>
>>	C is a delay machine with the 600ms roundtrip delay.
>>
>>            B & D have the gateway with the following configuration

>>		./configure --gateway=yes --tun=yes   
>>--low_idle=yes --low_cpu=yes 
>>
>>            The rfile on both B and D is
>>
>>	# GW Resource File - comments are allowed, starting with '#'.
>>#    Comments can be anywhere EXCEPT between parameter values.
>>
>># interface A info
>>AIF_NAME        eth1
>>AIF_RATE        10000000
>>AIF_BUF         32768
>>AIF_CC          1
>>AIF_TCPONLY     1
>>AIF_MTU         1500
>>AIF_TUN_NAME    tun0
>>
>>
>># interface B info
>>BIF_NAME        eth2
>>BIF_BUF         1000000
>>BIF_RATE        1000000
>>BIF_CC          0
>>BIF_MINRTO      600000
>>BIF_TUN_NAME    tun1
>>
>># IPFW info
>>C_DIVPORT       52000
>>C_TUN_NAME	    tun2
>>
>>
>>I am doing file transfer from E to A. 
>>
>>I can see the TCP checksum errors between D and C on some 
>>packets, but I don't see any checksum errors between E and D 
>>on the same packets.
>>
>>
>>Is somethog wrong with my setup??
>>
>>Is this something to do with the tp_Handler() function , 
>>32bit alignment ???     
>>
>>
>>Thanks
>>Jayasri
>>
>>
>>Come see us at CommunicAsia 2006 http://www.communicasia.com/
>>June 20-23, 2006 in Singapore at the US International 
>>Pavilion booth 6F1-03
>>
>>
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