D’ailleurs je reçoit bien du multicast de la nouvelle gateway qui est en 192.168.1.17 :
pi@JeedomBureau:~ $ sudo tcpdump -i eth0 -s0 -vv host 192.168.1.17 and net 224.0.0.0/4
tcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 262144 bytes
12:50:58.600463 IP (tos 0x0, ttl 255, id 13418, offset 0, flags [DF], proto UDP (17), length 221)
192.168.1.17.mdns > 224.0.0.251.mdns: [udp sum ok] 0*- [0q] 2/0/2 17.1.168.192.in-addr.arpa. (Cache flush) PTR Aqara-Hub-M1S-8F58.local., 8.5.F.8.5.2.E.F.F.F.4.4.F.E.6.5.0.0.0.0.0.0.0.0.0.0.0.0.0.8.E.F.ip6.arpa. (Cache flush) PTR Aqara-Hub-M1S-8F58.local. ar: 17.1.168.192.in-addr.arpa. (Cache flush) NSEC, 8.5.F.8.5.2.E.F.F.F.4.4.F.E.6.5.0.0.0.0.0.0.0.0.0.0.0.0.0.8.E.F.ip6.arpa. (Cache flush) NSEC (193)
12:50:58.619680 IP (tos 0xc0, ttl 1, id 0, offset 0, flags [DF], proto IGMP (2), length 40, options (RA))
192.168.1.17 > igmp.mcast.net: igmp v3 report, 1 group record(s) [gaddr 224.0.0.251 to_ex { }]
12:50:59.109033 IP (tos 0x0, ttl 255, id 13430, offset 0, flags [DF], proto UDP (17), length 169)
192.168.1.17.mdns > 224.0.0.251.mdns: [udp sum ok] 0 [2q] [3n] ANY (QU)? Aqara-Hub-M1S-1617._hap._tcp.local. ANY (QU)? Aqara-Hub-M1S-8F58.local. ns: Aqara-Hub-M1S-1617._hap._tcp.local. SRV Aqara-Hub-M1S-8F58.local.:36281 0 0, Aqara-Hub-M1S-8F58.local. A 192.168.1.17, Aqara-Hub-M1S-8F58.local. AAAA fe80::56ef:44ff:fe25:8f58 (141)
12:50:59.368999 IP (tos 0x0, ttl 255, id 13445, offset 0, flags [DF], proto UDP (17), length 169)
192.168.1.17.mdns > 224.0.0.251.mdns: [udp sum ok] 0 [2q] [3n] ANY (QM)? Aqara-Hub-M1S-1617._hap._tcp.local. ANY (QM)? Aqara-Hub-M1S-8F58.local. ns: Aqara-Hub-M1S-1617._hap._tcp.local. SRV Aqara-Hub-M1S-8F58.local.:36281 0 0, Aqara-Hub-M1S-8F58.local. A 192.168.1.17, Aqara-Hub-M1S-8F58.local. AAAA fe80::56ef:44ff:fe25:8f58 (141)
12:50:59.609559 IP (tos 0x0, ttl 255, id 13454, offset 0, flags [DF], proto UDP (17), length 221)
192.168.1.17.mdns > 224.0.0.251.mdns: [udp sum ok] 0*- [0q] 2/0/2 17.1.168.192.in-addr.arpa. (Cache flush) PTR Aqara-Hub-M1S-8F58.local., 8.5.F.8.5.2.E.F.F.F.4.4.F.E.6.5.0.0.0.0.0.0.0.0.0.0.0.0.0.8.E.F.ip6.arpa. (Cache flush) PTR Aqara-Hub-M1S-8F58.local. ar: 17.1.168.192.in-addr.arpa. (Cache flush) NSEC, 8.5.F.8.5.2.E.F.F.F.4.4.F.E.6.5.0.0.0.0.0.0.0.0.0.0.0.0.0.8.E.F.ip6.arpa. (Cache flush) NSEC (193)
12:50:59.719176 IP (tos 0x0, ttl 255, id 13462, offset 0, flags [DF], proto UDP (17), length 169)
192.168.1.17.mdns > 224.0.0.251.mdns: [udp sum ok] 0 [2q] [3n] ANY (QM)? Aqara-Hub-M1S-1617._hap._tcp.local. ANY (QM)? Aqara-Hub-M1S-8F58.local. ns: Aqara-Hub-M1S-1617._hap._tcp.local. SRV Aqara-Hub-M1S-8F58.local.:36281 0 0, Aqara-Hub-M1S-8F58.local. A 192.168.1.17, Aqara-Hub-M1S-8F58.local. AAAA fe80::56ef:44ff:fe25:8f58 (141)
12:50:59.979391 IP (tos 0x0, ttl 255, id 13470, offset 0, flags [DF], proto UDP (17), length 338)
192.168.1.17.mdns > 224.0.0.251.mdns: [udp sum ok] 0*- [0q] 6/0/2 Aqara-Hub-M1S-1617._hap._tcp.local. (Cache flush) TXT "c#=1" "ff=2" "id=3D:4C:89:29:AE:21" "md=ZHWG15LM" "pv=1.1" "s#=1" "sf=1" "ci=2" "sh=91GK7A==", _services._dns-sd._udp.local. PTR _hap._tcp.local., _hap._tcp.local. PTR Aqara-Hub-M1S-1617._hap._tcp.local., Aqara-Hub-M1S-1617._hap._tcp.local. (Cache flush) SRV Aqara-Hub-M1S-8F58.local.:36281 0 0, Aqara-Hub-M1S-8F58.local. (Cache flush) A 192.168.1.17, Aqara-Hub-M1S-8F58.local. (Cache flush) AAAA fe80::56ef:44ff:fe25:8f58 ar: Aqara-Hub-M1S-1617._hap._tcp.local. (Cache flush) NSEC, Aqara-Hub-M1S-8F58.local. (Cache flush) NSEC (310)
12:51:00.989083 IP (tos 0x0, ttl 255, id 13526, offset 0, flags [DF], proto UDP (17), length 338)
192.168.1.17.mdns > 224.0.0.251.mdns: [udp sum ok] 0*- [0q] 6/0/2 Aqara-Hub-M1S-1617._hap._tcp.local. (Cache flush) TXT "c#=1" "ff=2" "id=3D:4C:89:29:AE:21" "md=ZHWG15LM" "pv=1.1" "s#=1" "sf=1" "ci=2" "sh=91GK7A==", _services._dns-sd._udp.local. PTR _hap._tcp.local., _hap._tcp.local. PTR Aqara-Hub-M1S-1617._hap._tcp.local., Aqara-Hub-M1S-1617._hap._tcp.local. (Cache flush) SRV Aqara-Hub-M1S-8F58.local.:36281 0 0, Aqara-Hub-M1S-8F58.local. (Cache flush) A 192.168.1.17, Aqara-Hub-M1S-8F58.local. (Cache flush) AAAA fe80::56ef:44ff:fe25:8f58 ar: Aqara-Hub-M1S-1617._hap._tcp.local. (Cache flush) NSEC, Aqara-Hub-M1S-8F58.local. (Cache flush) NSEC (310)
12:51:01.619248 IP (tos 0x0, ttl 255, id 13531, of