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advanced-firewall [2023/05/28 04:26] – [Multicast] -clarity-very hard to understand hogwild | advanced-firewall [2023/05/28 05:39] (current) – [Multicast] -condense, list/explain additional features of new IGMPv2 messages hogwild | ||
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===== Firewall ===== | ===== Firewall ===== | ||
- | {{: | + | {{: |
- | **Limit communication | + | |
- | | + | **Limit communication to: **This specifies the maximum number of requests per second to which the Firewall will reply. Setting a limit number is recommended to prevent DDoS attacks.\\ |
+ | |||
+ | \\ | ||
+ | |||
+ | **Enable TCP SYN cookies: | ||
**Enable DCSP Fix: **Checking this enables a workaround for packet marking, a well-known issue related to DSCP when connected to Comcast. | **Enable DCSP Fix: **Checking this enables a workaround for packet marking, a well-known issue related to DSCP when connected to Comcast. | ||
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* LAN0 - Checking this means the LAN0 bridge will participate in IGMP proxy. | * LAN0 - Checking this means the LAN0 bridge will participate in IGMP proxy. | ||
* LAN1 - Checking this means the LAN1 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. | * LAN3 - Checking this means the LAN3 bridge will participate in IGMP proxy. | ||
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**Enable quick leave** - This is a feature of IGMP v2 and later. Enabling this allows the router to stop streaming multicast to an IP address as soon as that device sends a "quick leave" IGMP packet. | **Enable quick leave** - This is a feature of IGMP v2 and later. Enabling this allows the router to stop streaming multicast to an IP address as soon as that device sends a "quick leave" IGMP packet. | ||
- | **Custom Configuration** - This option allows you to set up advanced parameters for the IGMP proxy daemon. | + | **Custom Configuration** - This option allows you to set advanced parameters for the IGMP proxy daemon. |
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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 | + | **Efficient Multicast Forwarding (IGMP Snooping) -** IGMP snooping |
+ | |||
+ | However, caution is advised. IGMP Snooping can interfere with proper functioning of UPnP or DLNA. This can make Multicast configuration errors or deficiencies | ||
+ | |||
+ | A common symptom of this is a network host (say, a Smart TV) which appears | ||
+ | |||
+ | **Force IGMPv2** - IGMPv2 enhances IGMP with additional messages/ | ||
+ | |||
+ | Other features of IGMPv2 include: | ||
+ | |||
+ | 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. | ||
+ | |||
+ | MRT (Maximum Response Time) field. This new field in query messages specifies how much time hosts have to respond to the query. | ||
- | **Force IGMPv2** - IGMPv2 enhances the IGMP communication supporting additional messages/ | + | Querier election process. When two routers are connected |