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--- advanced-firewall [2023/05/28 04:44] – [Multicast] -clarity-IGMP snooping hogwild
+++ advanced-firewall [2023/05/28 05:05] – [Multicast] -clarity of IGMP Snooping and Force IGMPv2 details hogwild
@@ Line 50: / Line 50: @@
   * LAN0 - Checking this means the LAN0 bridge will participate in IGMP proxy.
   * LAN1 - Checking this means the LAN1 bridge will participate in IGMP proxy.
-  * LAN2 - Checking this means the LAN2 bridge will participate in IGMP proxy/
+  * LAN2 - Checking this means the LAN2 bridge will participate in IGMP proxy.
   * LAN3 - Checking this means the LAN3 bridge will participate in IGMP proxy.
@@ Line 73: / Line 73: @@
 **Udpxy port**- This specifies the port on which you can recive Udpxy information from your router.\\  \\   \\  {{:pasted:20220118-190844.png}}\\  \\
-**Efficient Multicast Forwarding (IGMP Snooping) -** IGMP snooping allows the router's switch to facilitate discovery of Multicast IGMP clients. The goal is to send multicast traffic only towards ports with at least one multicast subscriber?
+**Efficient Multicast Forwarding (IGMP Snooping) -** IGMP snooping makes the router's switch facilitate discovery of Multicast IGMP clients. This will help to send multicast traffic only towards ports with at least one multicast subscriber.
-Caution is advised, as often, UPnP is the only significant multicast application in use on a home network. Thus, multicast configuration issues or other deficiencies can appear as UPnP issues, when they're actually underlying network issues.
+However, caution is advised. Often, UPnP or DLNA is the only significant multicast application in use on a home network. Thus, multicast configuration issues or other deficiencies can appear as UPnP issues, but are actually underlying network issues.
-If IGMP snooping is enabled on a (wireless router)/switch, it will interfere with UPnP/DLNA device discovery (SSDP) if incorrectly or incompletely configured (e.g. without an active querier or IGMP proxy), making UPnP appear unreliable. Typical scenarios observed include a server or client (e.g. smart TV) appearing after power on, and then disappearing after a few minutes (often 30 by default configuration) due to IGMP group membership expiring. On this very topic please beware of the wireless multicast forwarding under [[advanced-wireless|Advanced Wireless]]
+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.
-**Force IGMPv2** - IGMPv2 enhances the IGMP communication supporting additional messages/behavior to optimise the end-to-end communication between client and server. Possibly the most important being the "Group Leave" message which is lacking instead in IGMP v1.\\   \\
+A common symptom of this is a network host (say, a Smart TV) which appears after it's powered on, but then "disappears" from the network after a few minutes. To be more precise, often this period is 30 minutes. This is because the defaut setting for when IGMP group membership will expire. Please be aware of the wireless multicast forwarding setting in the the //Advanced///[[advanced-wireless|Wireless]] menu.
+**Force IGMPv2** - IGMPv2 enhances IGMP with additional messages/behavior to optimize end-to-end client-server communication. Perhaps the most important of these additional messages is the "Group Leave" message. This message did not exist in previous IGMP versions.\\   \\

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