[lwip-devel] [bug #37969] SYN packet dropped as short packet in tcp_input function

[Simon Goldschmidt]

Update of bug #37969 (project lwip):

                  Status:               Need Info => Confirmed              
             Assigned to:                    None => goldsimon              
         Planned Release:                         => 1.5.0                  
            lwIP version:                   1.4.0 => git head               

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Follow-up Comment #3:

Thanks for the info. I've tested it with "PBUF_POOL_BUFSIZE 64" and also got
no connection.

lwIP makes the assumption that all IP/TCP/UDP headers must fit into the first
pbuf. With modern TCP implementations and a pbuf size of 64 bytes, this is
obviously not the case (since many TCP options can make the TCP header quite
big). I guess we'll have to fix that...

As a workaround, you could use "PBUF_POOL_BUFSIZE 128"...

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