Wireshark-bugs: [Wireshark-bugs] [Bug 5727] Wrong packet type association of SNMP trap after TFT

Date: Fri, 25 Feb 2011 09:55:49 -0800 (PST)
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=5727

--- Comment #1 from Stephen Fisher <steve@xxxxxxxxxxxxxxxxxx> 2011-02-25 10:55:48 MST ---
This comment from epan/dissectors/packet-tftp.c explains why this is happening.
 Someone will have to take a closer look to see if this can be improved.

    /*
     * The first TFTP packet goes to the TFTP port; the second one
     * comes from some *other* port, but goes back to the same
     * IP address and port as the ones from which the first packet
     * came; all subsequent packets go between those two IP addresses
     * and ports.
     *
     * If this packet went to the TFTP port, we check to see if
     * there's already a conversation with one address/port pair
     * matching the source IP address and port of this packet,
     * the other address matching the destination IP address of this
     * packet, and any destination port.
     *
     * If not, we create one, with its address 1/port 1 pair being
     * the source address/port of this packet, its address 2 being
     * the destination address of this packet, and its port 2 being
     * wildcarded, and give it the TFTP dissector as a dissector.
     */

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