Dans mon cas, j'ai donc un soucis avec IGMP !
Concernant le pare-feu, tout est ouvert en sortie.
Dans les logs, je vois bien le décodeur TV à destination de
239.255.255.250:1900 UDP
239.255.255.250 IGMP
Le Décodeur TV reçoit une IP + option (DNS d'Orange) du serveur DHCP du pfSense.
Edit :
J'ai capturé les trames du VLAN840.
Frame 1: 64 bytes on wire (512 bits), 64 bytes captured (512 bits)
Encapsulation type: Ethernet (1)
Arrival Time: Nov 28, 2016 11:08:21.618318000 Paris, Madrid
[Time shift for this packet: 0.000000000 seconds]
Epoch Time: 1480327701.618318000 seconds
[Time delta from previous captured frame: 0.000000000 seconds]
[Time delta from previous displayed frame: 0.000000000 seconds]
[Time since reference or first frame: 0.000000000 seconds]
Frame Number: 1
Frame Length: 64 bytes (512 bits)
Capture Length: 64 bytes (512 bits)
[Frame is marked: False]
[Frame is ignored: False]
[Protocols in frame: eth:ethertype:ip:igmp:igmp]
[Coloring Rule Name: Checksum Errors]
[Coloring Rule String [truncated]: eth.fcs.status=="Bad" || ip.checksum.status=="Bad" || tcp.checksum.status=="Bad" || udp.checksum.status=="Bad" || sctp.checksum.status=="Bad" || mstp.checksum.status=="Bad" || cdp.checksum.status=="Bad" ||]
Ethernet II, Src: ThomsonT_63:ff:00 (00:90:d0:63:ff:00), Dst: IPv4mcast_01 (01:00:5e:00:00:01)
Destination: IPv4mcast_01 (01:00:5e:00:00:01)
Address: IPv4mcast_01 (01:00:5e:00:00:01)
.... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
.... ...1 .... .... .... .... = IG bit: Group address (multicast/broadcast)
Source: ThomsonT_63:ff:00 (00:90:d0:63:ff:00)
Address: ThomsonT_63:ff:00 (00:90:d0:63:ff:00)
.... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
.... ...0 .... .... .... .... = IG bit: Individual address (unicast)
Type: IPv4 (0x0800)
Padding: 0000000000000000000000000000
Frame check sequence: 0x00000000 [incorrect, should be 0xbdd08c9d]
[Expert Info (Error/Checksum): Bad checksum [should be 0xbdd08c9d]]
[Bad checksum [should be 0xbdd08c9d]]
[Severity level: Error]
[Group: Checksum]
[FCS Status: Bad]
Internet Protocol Version 4, Src: 172.28.123.102, Dst: 224.0.0.1
Internet Group Management Protocol
[IGMP Version: 2]
Type: Membership Query (0x11)
Max Resp Time: 10.0 sec (0x64)
Checksum: 0xee9b [correct]
[Checksum Status: Good]
Multicast Address: 0.0.0.0