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advanced-firewall [2022/01/21 02:45] – clarity, formatting 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 |
- | The Firewall page allows you to configure options to protect/facilitate | + | The Firewall page allows you to configure options to protect |
- | {{: | ||
- | **WAN interfaces respond to ping and traceroute** - When enabled, this allows your device will reply to certain ICMP/UDP packets so that //ping //and // | + | ===== Firewall ===== |
- | **Limit communication to **- Specifies | + | {{: |
+ | |||
+ | \\ **WAN interfaces respond to ping and traceroute: | ||
+ | |||
+ | **Limit communication to: | ||
\\ | \\ | ||
- | {{:pasted: | + | **Enable TCP SYN cookies: |
- | **Enable | + | **Enable |
- | **Enable DCSP Fix** - This enables a workaround for a well-known issue related to DSCP (packet marking) when connected to the Comcast ISP. | + | **Allow DHCP Spoofing: |
- | **IPv6 IPSec Passthrough** - FIXME\\ | + | **Smart MTU black hole detection:** |
- | {{: | ||
- | **NAT loopback** | + | ===== NAT ===== |
+ | |||
+ | **NAT loopback:** This technique allows LAN devices to access | ||
* All | * All | ||
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* Disabled | * Disabled | ||
- | **NAT target** - Defines | + | \\ |
+ | |||
+ | {{:: | ||
+ | |||
+ | **NAT target** - This defines | ||
\\ | \\ | ||
- | Multicast\\ {{: | ||
- | **Enable IGMP proxy** - Runs the IGMP (Internet Group Management Protocol) | + | ===== Multicast ===== |
+ | |||
+ | \\ \\ {{: | ||
+ | |||
+ | **Enable IGMP proxy** - Checking this enables | ||
+ | |||
+ | LAN0 - LAN3 Specifies which bridges will participate | ||
+ | |||
+ | | ||
+ | * LAN1 - Checking this means the LAN1 bridge will participate in IGMP proxy. | ||
+ | | ||
+ | * LAN3 - Checking this means the LAN3 bridge will participate in IGMP proxy. | ||
\\ | \\ | ||
- | {{: | + | **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 advanced parameters for the IGMP proxy daemon. Consult official IGMP documentation before using this.\\ | ||
+ | |||
+ | | ||
+ | |||
+ | **Enable Udpxy** - Like IGMP proxy, Udpxy allows multicast communications between devices on different VLANs. Since their behavior is very similar, you are advised to use either Udpxy or IGMP proxy, but not both at once. | ||
+ | |||
+ | **Upstream interface** - Here, enter the stream source is expected to live. (Default: blank). | ||
+ | |||
+ | **LAN0/ | ||
+ | |||
+ | **Enable client statistics** - Enabling this causes FreshTomato to collect statistics about Udpxy clients. | ||
+ | |||
+ | **Max clients - ** This represents the maximum number of simultaneous Udpxy clients. Udpxy is is a lightweight protocol, and only works well for a limited number of clients. For this reason, you might want to impose a maximum limit. | ||
- | **Enable | + | **Udpxy |
- | **Upstream interface** - Defines where the stream source is expected to live. (Default: blank). | + | **Efficient Multicast Forwarding (IGMP Snooping) -** IGMP snooping makes the router' |
- | **LAN0/LAN1/LAN2/LAN3** - This is where the stream clients are expected to live. | + | However, caution is advised. IGMP Snooping can interfere with proper functioning of UPnP or DLNA. This can make Multicast configuration errors or deficiencies appear as UPnP issues. Enabling IGMP snooping on a router' |
- | **Enable client statistics** - Enabling | + | A common symptom of this is a network host (say, a Smart TV) which appears after it's powered on, but then " |
- | **Max clients -** Considering this is a lightwave protocol it works well for a limited number of clients, you might want to impose a maximum number.Specifies | + | **Force IGMPv2** - IGMPv2 enhances IGMP with additional messages/ |
- | **Udpxy port**- This is where you can consult the Udpxy information on your router.\\ | + | 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. |
- | **Efficient Multicast Forwarding | + | MRT (Maximum Response Time) field. This new field in query messages specifies how much time hosts have to respond |
- | **Force IGMPv2** - IGMPv2 enhances the IGMP communication supporting additional messages/ | + | Querier election process. When two routers are connected |