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[lwip-devel] [bug #29080] Remote side seems to uverrun our rcv_wnd with


From: Simon Goldschmidt
Subject: [lwip-devel] [bug #29080] Remote side seems to uverrun our rcv_wnd with ooseq enabled
Date: Mon, 08 Mar 2010 16:51:55 +0000
User-agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; de; rv:1.9.2) Gecko/20100115 Firefox/3.6

Follow-up Comment #4, bug #29080 (project lwip):

Thanks for the pcap files. From reading them, it really looks like the PC is
overrunning lwIP's receive window, e.g. in file dupack_oos_on.pcap, packet
#2351 (which seems to be the one that leads to the failed assertion):

- wireshark says "Number of bytes in flight: 35040"
- but lwIP (192.168.1.100, is that correct?) sends a window of 32768 bytes
only

this means that the PC sends more than it is allowed and we didn't handle
that correctly. Could you tell us which OS and application the pc is running?

BTW: lwIP announces an MSS of 1476 with the SYN, which I doubt is correct.
This should be 1460. Please check your TCP_MSS, the bug might be solved for
you by changing that...

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