[Samba] internalDNS more TCP connections without closing

[市川＠フォーミックス]

Hi.


I upgrade samba-ad-dc  4.12.6 to 4.13.2.

I use GoogleWifiAP, it sometime access SambaAD-DC internal DNS by TCP protocol.
Since recently, I troubled More and more connections without closing.

TCPDUMPed(and wireshark)
> No. Time Source Destination Protocol Length Info
> 23 2020-11-10 19:21:40.775442 [GoogleWifiAP] [SambaAD-DC] TCP 74 48861 → 53 [SYN] Seq=0 Win=29200 Len=0 MSS=1460 SACK_PERM=1 TSval=194291876 TSecr=0 WS=64
> 24 2020-11-10 19:21:40.775505 [SambaAD-DC] [GoogleWifiAP] TCP 74 53 → 48861 [SYN, ACK] Seq=0 Ack=1 Win=28960 Len=0 MSS=1460 SACK_PERM=1 TSval=1380837521 TSecr=194291876 WS=128
> 25 2020-11-10 19:21:40.776362 [GoogleWifiAP] [SambaAD-DC] TCP 66 48861 → 53 [ACK] Seq=1 Ack=1 Win=29248 Len=0 TSval=194291877 TSecr=1380837521
> 26 2020-11-10 19:21:40.777510 [GoogleWifiAP] [SambaAD-DC] TCP 68 48861 → 53 [PSH, ACK] Seq=1 Ack=1 Win=29248 Len=2 TSval=194291877 TSecr=1380837521 [TCP segment of a reassembled PDU]
> 27 2020-11-10 19:21:40.777553 [SambaAD-DC] [GoogleWifiAP] TCP 66 53 → 48861 [ACK] Seq=1 Ack=3 Win=29056 Len=0 TSval=1380837523 TSecr=194291877
> 28 2020-11-10 19:21:40.777568 [GoogleWifiAP] [SambaAD-DC] TCP 1514 48861 → 53 [ACK] Seq=3 Ack=1 Win=29248 Len=1448 TSval=194291877 TSecr=1380837521 [TCP segment of a reassembled PDU]
> 29 2020-11-10 19:21:40.777577 [SambaAD-DC] [GoogleWifiAP] TCP 66 53 → 48861 [ACK] Seq=1 Ack=1451 Win=31872 Len=0 TSval=1380837523 TSecr=194291877
> 30 2020-11-10 19:21:40.778090 [GoogleWifiAP] [SambaAD-DC] DNS 340 Standard query 0xd7fa TKEY sig-dc01c.fmxad.fourmix.co.jp TKEY
> 31 2020-11-10 19:21:40.778105 [SambaAD-DC] [GoogleWifiAP] TCP 66 53 → 48861 [ACK] Seq=1 Ack=1725 Win=34816 Len=0 TSval=1380837523 TSecr=194291877
> 32 2020-11-10 19:21:40.778478 [SambaAD-DC] [GoogleWifiAP] DNS 190 Standard query response 0xd7fa TKEY sig-dc01c.fmxad.fourmix.co.jp TKEY
> 33 2020-11-10 19:21:40.779092 [GoogleWifiAP] [SambaAD-DC] TCP 66 48861 → 53 [ACK] Seq=1725 Ack=125 Win=29248 Len=0 TSval=194291877 TSecr=1380837524
 ...
> 214 2020-11-10 21:25:58.275138 [SambaAD-DC] [GoogleWifiAP] TCP 66 [TCP Keep-Alive] 53 → 48861 [ACK] Seq=124 Ack=1725 Win=34816 Len=0 TSval=1388294996 TSecr=194291877
> 226 2020-11-10 21:25:58.276080 [GoogleWifiAP] [SambaAD-DC] TCP 66 [TCP Keep-Alive ACK] 48861 → 53 [ACK] Seq=1725 Ack=125 Win=29248 Len=0 TSval=195037623 TSecr=1380837524
> 354 2020-11-10 23:28:18.307073 [SambaAD-DC] [GoogleWifiAP] TCP 66 [TCP Keep-Alive] 53 → 48861 [ACK] Seq=124 Ack=1725 Win=34816 Len=0 TSval=1395635003 TSecr=195037623
> 366 2020-11-10 23:28:18.308213 [GoogleWifiAP] [SambaAD-DC] TCP 66 [TCP Keep-Alive ACK] 48861 → 53 [ACK] Seq=1725 Ack=125 Win=29248 Len=0 TSval=195771623 TSecr=1380837524
 ... TCP Keep-Alive continue by 2 hours


Which shuld send FIN or RST ?
Can it be solved by changing some settings?


Regards,