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Re: [lwip-devel] SYN-SENT state does not accept SYN only segment


From: address@hidden
Subject: Re: [lwip-devel] SYN-SENT state does not accept SYN only segment
Date: Wed, 14 Mar 2012 21:53:39 +0100
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:10.0.2) Gecko/20120216 Thunderbird/10.0.2

narke wrote:
I found in lwIP,  when an active open pcb in its SYN-SENT state and
received an segment sent from peer which has SYN flag but w/o ACK
flag,  the pcb just ignore the segment.  However, in RFC 793, it is
required to accept the SYN only segment in SYN-SENT state and switch
to SYN-RCVD state.

Can anyone please confirm this?  It's a bug or a dedicated design?

Well spotted, I think your observations are correct! I don't think it's a dedicated design, although I've never seen a stack behaving like that. Therefore I'd regard this as low prio (not targeting 1.4.1). Would you mind filing a bug?

Thanks,
Simon



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