Jozsef Kadlecsik escribió:
The TCP keepalived packet in the output above is invalid: it's sequence
number is wrong.
Best regards,
Jozsef
Thanks for your reply Jozsef. After your reply I look at RFC 1122, It say:
"Some TCP implementations, however, have included a keep-alive
mechanism. To confirm that an idle connection is still active, these
implementations send a probe segment designed to elicit a response from
the peer TCP. Such a segment generally contains SEG.SEQ = SND.NXT-1"
..."so that this SEG.SEQ will be outside the window. Therefore, the
probe causes the receiver to return an acknowledgment segment"
When I try with a linux box sending TCP KA, I see that this sets the ACK
flag on TCP KeepAlive and that works correctly. I think that my remote
equipments (GPRS Modems) are making TCP KA is the wrong way. Or maybe
the GPRS Service Provider are touching my packets.
Thanks Again.
Regards
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