Hi, It was found on Sun Fire V440 with Solaris 9. NIC is ce and MTU is set to 1500. During the TCP connect phase, the TCP MSS value returned in the SYN ACK packet by V440 is 110. We can't figure out why the value is so small, 'cause in most cases it should be 1460. By using ethereal, we captured the packets for both nomal case (MSS is 1460) and abnormal case (MSS is 110), we found the only difference is: In normal case, the IP DSCP value of the initial connection request from client is set to 0, while in the abnormal case, DSCP value is set to 0x12. We don't know if that's the root cause of getting a small MSS in SYN ACK? If yes, how DSCP value affects the MSS calculation in brief? If no, where else should we look for the root cause?
Thank you for helping. -- Hunter This message posted from opensolaris.org _______________________________________________ networking-discuss mailing list [email protected]
