picoquic supports 3 test cases of connection migration.
```
-f migration_mode Force client to migrate to start migration:
-f 1 test NAT rebinding,
-f 2 test CNXID renewal,
-f 3 test migration to new address.
```
ATS passed `-f 2` and `-f 3`, but failed on `-f 1`.
Debug logs of ATS is below
```
[Sep 27 14:39:24.754] {0x70000b309000} DEBUG: <QUICPacketHandler.cc:242
(_recv_packet)> (quic_sec) [8a898384-d3ee8c82] recv LH
packet from 127.0.0.1:63750 size=1252
[Sep 27 14:39:24.754] {0x70000b309000} DEBUG: <QUICPacketHandler.cc:305
(_recv_packet)> (quic_sec) [8a898384-d3ee8c82] client
initial dcid=d3ee8c8259882d11
[Sep 27 14:39:24.754] {0x70000b309000} DEBUG: <QUICNetVConnection.cc:105
(init)> (quic_net) [8a898384-08bfc615]
dcid=8a8983845d8732f2 scid=08bfc615e0f069433e2fe8d603afaf0c3a98
...
[Sep 27 14:39:24.879] {0x70000b2f7000} DEBUG: <HQSessionAccept.cc:56 (accept)>
(hq) [8a898384-08bfc615] accepted
connection from 127.0.0.1:63750 transport type = 6
[Sep 27 14:39:24.879] {0x70000b2f7000} DEBUG: <QUICNetVConnection.cc:1738
(_switch_to_e> (quic_net) [8a898384-08bfc615] Enter
state_connection_established
[Sep 27 14:39:24.879] {0x70000b2f7000} DEBUG: <QUICNetVConnection.cc:1739
(_switch_to_e> (quic_net) [8a898384-08bfc615] Negotiated
cipher suite: TLS_AES_256_GCM_SHA384
...
[Sep 27 14:39:24.888] {0x70000b2f7000} DEBUG: <QUICPacketHandler.cc:129
(_send_packet)> (quic_sec) [8a898384-08bfc615] send LH
packet to 127.0.0.1:63750 size=949
[Sep 27 14:39:24.955] {0x70000b309000} DEBUG: <QUICPacketHandler.cc:270
(_recv_packet)> (quic_sec) [00000000-08bfc615] recv SH
packet from 127.0.0.1:49808 size=146
[Sep 27 14:39:24.955] {0x70000b309000} DEBUG: <QUICPacketHandler.cc:270
(_recv_packet)> (quic_sec) [00000000-08bfc615] recv SH
packet from 127.0.0.1:49808 size=1440
...
[Sep 27 14:39:25.211] {0x70000b2f7000} DEBUG: <QUICPacketHandler.cc:129
(_send_packet)> (quic_sec) [8a898384-00000000] send SH
packet to 127.0.0.1:63750 size=891
[Sep 27 14:39:25.470] {0x70000b309000} DEBUG: <QUICPacketHandler.cc:270
(_recv_packet)> (quic_sec) [00000000-08bfc615] recv SH
packet from 127.0.0.1:49808 size=148
...
```
It looks like the client changed port from `63750` to `49808` (NAT rebinding
simulation), but ATS keep sending packets to old port.
[ Full content available at:
https://github.com/apache/trafficserver/issues/4326 ]
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