Lingyun Li wrote:
> 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?
Are you saying that Solaris 9 is sending out a SYN/ACK with MSS
option value equals to 110? If this is true, I guess there is
a bug, possibly memory corruption, somewhere. Did you also see
this with another NIC?
--
K. Poon.
[EMAIL PROTECTED]
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