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advanced-firewall [2022/01/18 19:14] – rs232 | advanced-firewall [2023/05/28 05:05] – [Multicast] -clarity of IGMP Snooping and Force IGMPv2 details hogwild | ||
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+ | ====== Firewall ====== | ||
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+ | The Firewall page allows you to configure options to protect or facilitate various types of network communications. | ||
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===== Firewall ===== | ===== Firewall ===== | ||
- | The Firewall page allows | + | {{: |
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+ | \\ **WAN interfaces respond to ping and traceroute: | ||
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+ | **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.\\ | ||
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+ | \\ | ||
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+ | **Enable TCP SYN cookies: | ||
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+ | **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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+ | **Allow DHCP Spoofing: ** | ||
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+ | **Smart MTU black hole detection: | ||
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+ | |||
+ | ===== NAT ===== | ||
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+ | **NAT loopback:** This technique allows LAN devices to access each other via the router' | ||
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+ | * All | ||
+ | * Forwarded Only | ||
+ | * Disabled | ||
+ | |||
+ | \\ | ||
+ | |||
+ | {{:: | ||
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+ | **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. | ||
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+ | \\ | ||
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+ | ===== Multicast ===== | ||
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+ | \\ \\ {{: | ||
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+ | **Enable IGMP proxy** - Checking this enables the IGMP (Internet Group Management Protocol) service. | ||
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+ | LAN0 - LAN3 Specifies which bridges will participate in IGMP, with the router acting as a proxy between selected LANs. This allows IGMP to work between VLANs. | ||
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+ | * 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. | ||
+ | * 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. | ||
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+ | **Custom Configuration** - This option allows you to set advanced parameters for the IGMP proxy daemon. Consult official IGMP documentation before using this.\\ | ||
+ | |||
+ | \\ {{: | ||
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+ | **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. | ||
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+ | **Upstream interface** - Here, enter the stream source is expected to live. (Default: blank). | ||
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+ | **LAN0/ | ||
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+ | **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. | ||
- | {{: | + | **Udpxy port**- This specifies the port on which you can recive Udpxy information from your router.\\ |
- | **WAN interfaces respond to ping and traceroute** - When enabled this option allows your device to respond to certain ICMP/UDP packets so that a '' | + | |
- | **Limit communication to**: This number imposes a maximum number of requests per seconds. It is advised to set up a limit to prevent DDOS attacks.\\ | + | |
- | {{: | + | **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. |
- | **Enable TCP SYN cookies** - Enabling this will protect | + | |
- | **Enable DCSP Fix** - This enables a work-around for a well-known issue related SCP (packet marking) when connected to the ISP Comcast\\ | + | |
- | **IPv6 IPSec Passthrough** - FIXME\\ | + | |
- | {{: | + | However, caution |
- | **NAT loopback** - NAT loopback a.k.a Hairpinning | + | |
- | **NAT target** - Define the way NAT is implemented for the sake of Hairpinning. Masquerade is the default however this involves an additional lookup ad the mapping of done towards an interface. SNAT is faster (if ever measurable) | + | |
- | Multicast\\ | + | Enabling |
- | {{: | + | |
- | **Enable | + | |
- | **LAN0/LAN1/LAN2/LAN3** - where enabled the bridges will partecipate in IGMP subscription using the router as a proxy between | + | |
- | **Enable quick leave** - This is a feature of IGMP v2 and allows the router to stop streaming of the multicast IP as soon as the end device sends the quick leave IGMP packet.\\ | + | |
- | **Custom Configuration** - This option allows you to set up some advanced parameters for the IGMP proxy daemon. Make sure to consult the official documentation.\\ | + | |
- | {{: | + | A common symptom of this is a network host (say, a Smart TV) which appears after it's powered on, but then " |
- | **Enable Udpxy** - Similarly to IGMP proxy Udpxy allows multicast communication between sender and receiver sitting in different VLANs. NOTE: since the behavior | + | |
- | **Upstream interface** - leave empty for default - Defines where the stream source | + | |
- | **LAN0/ | + | |
- | **Enable client statistics** - As the option suggest if enabled statistical information about the clients is collected.\\ | + | |
- | **Max clients** | + | |
- | **Udpxy port**- This is where you can consult the Udpxy information on your router.\\ | + | |
- | {{: | + | **Force IGMPv2** - IGMPv2 enhances IGMP with additional messages/ |
- | **Efficient Multicast Forwarding (IGMP Snooping)** - IGMP snooping is a way to have the switch (router) facilitating the discovery of multicast (IGMP) clients. Beware that enabling IGMP snooping might interfare with some multicast based applications/ | + | |
- | **Force IGMPv2** - IGMPv2 enhances | + | |