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advanced-firewall [2022/01/21 01:34] – -clarity, spelling, formatting hogwild | advanced-firewall [2023/05/28 05:05] – [Multicast] -clarity of IGMP Snooping and Force IGMPv2 details hogwild | ||
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+ | ====== Firewall ====== | ||
+ | |||
+ | The Firewall page allows you to configure options to protect or facilitate various types of network communications. | ||
+ | |||
+ | |||
===== Firewall ===== | ===== Firewall ===== | ||
- | The Firewall page allows you to configure options to protect/ | + | {{: |
- | {{: | + | \\ **WAN interfaces respond to ping and traceroute: |
- | **WAN interfaces respond | + | **Limit communication |
- | **Limit communication to**: Specifies | + | \\ |
+ | |||
+ | **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. | ||
+ | |||
+ | **Allow DHCP Spoofing: ** | ||
+ | |||
+ | **Smart MTU black hole detection: | ||
+ | |||
+ | |||
+ | ===== NAT ===== | ||
+ | |||
+ | **NAT loopback:** This technique allows LAN devices to access each other via the router' | ||
+ | |||
+ | * All | ||
+ | * Forwarded Only | ||
+ | * Disabled | ||
+ | |||
+ | \\ | ||
+ | |||
+ | {{:: | ||
+ | |||
+ | **NAT target** - This defines the way NAT is implemented for use during loopback. Masquerade is the default, but involves an additional lookup. ad the mapping of done towards an interface. SNAT is minutely faster, as the NAT mapping points directly to the destination IP and so it bypasses the lookup stage. However, SNAT is less reliable than Masquerade. | ||
\\ | \\ | ||
- | {{: | ||
- | **Enable | + | ===== Multicast ===== |
+ | |||
+ | \\ \\ {{: | ||
+ | |||
+ | **Enable | ||
+ | |||
+ | LAN0 - LAN3 Specifies which bridges will participate in IGMP, with the router | ||
+ | |||
+ | * 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 | ||
+ | * 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** | ||
+ | |||
+ | **LAN0/LAN1/ | ||
- | **Enable | + | **Enable |
- | **IPv6 IPSec Passthrough** - FIXME\\ | + | **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. |
- | {{: | + | **Udpxy port**- This specifies the port on which you can recive Udpxy information from your router.\\ |
- | **NAT loopback** - also known as " | + | **Efficient Multicast Forwarding (IGMP Snooping) -** IGMP snooping makes the router's switch facilitate discovery |
- | **NAT target** - Defines the way NAT is implemented for the sake of Hairpinning. Masquerade | + | However, caution |
- | Multicast\\ | + | Enabling |
- | {{: | + | A common symptom of this is a network host (say, a Smart TV) which appears after it's powered on, but then " |
- | {{: | + | **Force IGMPv2** - IGMPv2 enhances IGMP with additional messages/ |