a IP packet is 'upper' in spite to 'ethernet', keyword 'encapsulating' above means it: a single IP packet is encapsulated in one, or several ethernet datagrams.both nodes will be replying CRC (cyclic redundancy check) that validate whether a packet was sent successfully, so the check will be, at least, erractic.This does not work in practice for, at least, two reasons:
#Blacklist mac address wifi mac
If two devices in the same physical network have the same MAC address, they will be receiving data at the same time no matter which one is the target for that packet of data.Īt first, one could think it could work, because while both parties are receiving datagrams, each one will receive a datagram encapsulating a IP address they have, so they could just discard the packet if not addressed to their IP address and use the ones for them. The MAC address is equivalent to the IP address (192.168.1.2 for example) when locating devices in the immediately local network (which usually share the same IP address range). Then you may be asking yourself: Why you can't just have all devices directly to it with the same MAC address? This address is a lower-than-IP level layer for local network communication.
#Blacklist mac address wifi full
You'd then just need to add the MAC of that router to the other one and connect any device you want to the second router.Īll traffic coming to the remote router, assuming you are using its dedicated WAN port (or wireless dedicated client port) will be presented only with the "new" router, whilst you will have full management access to it. then you have rules to ACCEPT only the MAC addresses you want and DROP all others.One way to do what you want is by having another WIFI/Wired router (which then you can use stronger encryption methods, or whatever) and connect this router to the mac-filtered one.You can prevent DHCP requests by blocking communication on these ports.Īppend one or more rules to the end of the selected chain. DHCP uses ports 67 and 68 and the UDP protocol.
the raw table provides PREROUTING(for packets arriving via any network interface), -A appends the rule to your chain.There must be no target of that name already. and create a new chain name to reference.Ĭreate a new user-defined chain by the given name.This option specifies the packet matching table which the command should operate on. It provides the following built-in chains: PREROUTING (for packets arriving via any network interface) OUTPUT (for packets generated by local processes) -t, -table table
It registers at the netfilter hooks with higher priority and is thus called before ip_conntrack, or any other IP tables. Raw: This table is used mainly for configuring exemptions from connection tracking in combination with the NOTRACK target. Iptables -t raw -A DHCP_clients -m mac -mac-source -j ACCEPT
Iptables -t raw -A PREROUTING -p udp -dport 67 -j DHCP_clients # Incoming DHCP, pass to chain processing DHCP # Create the DHCP_clients chain in the 'raw' table
You can try using iptables to filter by MAC address.
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