no ipv4That is the IPv6 firewall to your LAN devices. Is that really what you want? Is Transmission really running on a server on your LAN and using IPv6 only?
admin@asus:/tmp/home/root# ncat -l -p 20000
test
^C
root@hz ~ # telnet XX.XX.XX.XX 20000
Trying XX.XX.XX.XX...
Connected to XX.XX.XX.XX.
Escape character is '^]'.
test
Connection closed by foreign host.
admin@asus:/tmp/home/root# ncat -l -p 20000
root@hz ~ # telnet XX.XX.XX.XX 20000
Trying XX.XX.XX.XX...
telnet: Unable to connect to remote host: Connection timed out
May 6 15:37:54 kernel: DROP IN=eth0 OUT= MAC= SRC= DST= LEN=60 TOS=0x00 PREC=0x00 TTL=51 ID=62482 DF PROTO=TCP SPT=55396 DPT=20000 SEQ=1915437760 ACK=0 WINDOW=65535 RES=0x00 SYN URGP=0 OPT (020405B40402080A2570116A000000000103030A) MARK=0x8000000
iptables -I INPUT 9 -p tcp --dport 40000 -j ACCEPT
admin@asus:/tmp/home/root# iptables -L -v -n --line-numbers
Chain INPUT (policy ACCEPT 0 packets, 0 bytes)
num pkts bytes target prot opt in out source destination
1 6670 859K ACCEPT all -- * * 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED
2 0 0 DROP all -- * * 0.0.0.0/0 0.0.0.0/0 state INVALID
3 822 123K PTCSRVWAN all -- !br0 * 0.0.0.0/0 0.0.0.0/0
4 109 7331 PTCSRVLAN all -- br0 * 0.0.0.0/0 0.0.0.0/0
5 109 7331 ACCEPT all -- br0 * 0.0.0.0/0 0.0.0.0/0 state NEW
6 119 32080 ACCEPT all -- lo * 0.0.0.0/0 0.0.0.0/0 state NEW
7 703 91098 OVPN all -- * * 0.0.0.0/0 0.0.0.0/0 state NEW
8 93 30783 ACCEPT udp -- * * 0.0.0.0/0 0.0.0.0/0 udp spt:67 dpt:68
9 52 2768 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:40000
10 0 0 ACCEPT icmp -- * * 0.0.0.0/0 0.0.0.0/0
11 558 57547 DROP all -- * * 0.0.0.0/0 0.0.0.0/0
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