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Which is the default reject port in nftables?
In a base chain it is equivalent to accept jump : Continue at the first rule of . It will continue at the next rule after a return statement is issued The default reject will be the ICMP type port-unreachable. The icmpx is only used for inet family support.
How to create a list of nftables rules?
% nft list chain filter ouput table ip filter { chain output { type filter hook output priority 0; ip daddr 8 .8.8.8 counter packets 0 bytes 0 tcp dport ssh counter packets 0 bytes 0 } } There are plenty of output text modifiers than can be used when listing your rules, to for example, translate IP addresses to DNS names, TCP protocols, etc.
What can traffic hooks be used for in nftables?
They use the structure of a set and are a powerful component within nftables, as they can include the verdict. Each type of traffic has one or more possible traffic hooks. They can be used to make more specific filters. dport/sport: destination port or source port.
When to use handle as reference in nftables?
If you want to add a rule at a given position, you have to use the handle as reference: % nft list table filter -n -a table filter { chain output { type filter hook output priority 0; ip protocol tcp counter packets 82 bytes 9680 # handle 8 ip saddr 127 .0.0.1 ip daddr 127 .0.0.6 drop # handle 7 } }
Is there a realistic limit to the number of rules nftables can process?
It has a firewall connected to the internet (WAN) with real IP and DNS name which also acts as a DHCP server for the internal network (LAN). On the firewall machine I’ve setup I am designing a large SaaS VPN service and am planning to use nftables. Is there a realistic limit to the number of rules it can process?
What does the NFT stand for in nftables?
nft is the command line tool in order to interact with nftables at userspace. family refers to a one of the following table types: ip, arp, ip6, bridge, inet, netdev . The argument -n shows the addresses and other information that uses names in numeric format. The -a argument is used to display the handle .
What are the different types of nftables hooks?
Possible types are: filter: Supported by arp, bridge, ip, ip6 and inet table families. route: Mark packets (like mangle for the output hook, for other hooks use the type filter instead), supported by ip and ip6. nat: In order to perform Network Address Translation, supported by ip and ip6.