[Sis-SCPS-INTEREST] checksum errors

[Jayasri Sangu]

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


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