The iptables helper match is supported by Shorewall in the form of the HELPER column in shorewall-mangle (5) and shorewall-tcrules (5). The CT target is supported directly in shorewall-conntrack (5). In these files, Shorewall supports the same module names as iptables; see the table above.
Man page of IPTABLES - Netfilter Iptablesand ip6tablesare used to set up, maintain, and inspect the tables of IPv4 and IPv6 packet filter rules in the Linux kernel. Several different tables may be defined. Each table contains a number of built-in Man page of iptables-extensions - Netfilter iptables -A INPUT -i eth0 -p tcp --dport 80 -m state --state INVALID -j DROP TCPMSS This target allows to alter the MSS value of TCP SYN packets, to control the maximum size for that connection (usually limiting it to your outgoing interface's MTU minus 40 for IPv4 or 60 for IPv6, respectively). IPtables Configure | ZP Helper Jul 29, 2017
#6355 (Possible ongoing conntrack misconfiguration?) – DD-WRT
Iptables is an extremely knowledge intensive tool. This means that iptables takes quite a bit of knowledge to be able to use iptables to it's full extent. Among other things, you must have a very good understanding of the TCP/IP protocol. Linux Iptables Allow NFS Clients to Access the NFS Server
Iptables is an extremely knowledge intensive tool. This means that iptables takes quite a bit of knowledge to be able to use iptables to it's full extent. Among other things, you must have a very good understanding of the TCP/IP protocol.
kern.info kernel: [ 6097.430000] nf_conntrack: automatic helper assignment is deprecated and it will be removed soon. Use the iptables CT target to attach helpers instead. 18.04 - Adding manual iptables rules to UFW - Ask Ubuntu