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advanced-firewall [2023/05/28 05:05] – [Multicast] -clarity of IGMP Snooping and Force IGMPv2 details hogwild | advanced-firewall [2023/05/28 05:39] (current) – [Multicast] -condense, list/explain additional features of new IGMPv2 messages hogwild | ||
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**Udpxy port**- This specifies the port on which you can recive Udpxy information from your router.\\ | **Udpxy port**- This specifies the port on which you can recive Udpxy information from your router.\\ | ||
- | **Efficient Multicast Forwarding (IGMP Snooping) -** IGMP snooping makes the router' | + | **Efficient Multicast Forwarding (IGMP Snooping) -** IGMP snooping makes the router' |
- | However, caution is advised. | + | However, caution is advised. |
- | Enabling IGMP snooping on a wireless router's/switch will interfere with UPnP/DLNA device discovery. Specifically, the SSDP protocol transmissions. If IGMP snooping is incorrectly or incompletely configured (say, without an active querier or IGMP proxy), this make UPnP appear unreliable. | + | A common symptom of this is a network host (say, a Smart TV) which appears after it' |
- | A common symptom | + | **Force IGMPv2** - IGMPv2 enhances IGMP with additional messages/ |
- | **Force | + | Other features of IGMPv2 |
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+ | Group specific membership query. The router can now send a membership query for a specific group address. When the router receives a leave group message, it will use this query to check if there are still any hosts interested in receiving the multicast traffic. | ||
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+ | MRT (Maximum Response Time) field. This new field in query messages | ||
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+ | Querier election process. When two routers are connected to the same subnet, only one of them should send query messages. Having an "election" | ||