8/18/2023 0 Comments Unreplied vs assured connection![]() For this connection, packets have been seen in both directions. mark) appear only if the kernel was built with specific options. sport and dport for TCP and UDP, type and code for ICMP). Please note that some column names appear only for specific protocols (eg. In case the connection tracking cache overflows, these connections are dropped first. : Traffic has not been seen in response direction yet.Then, the first occurrence relates to the request direction and the second occurrence relates to the response direction. A line can contain up to two columns having the same name (eg. ![]() ![]() Sixth column (Not all protocols): The connection state.Īll other columns are named ( key=value) or represent flags (,.Fifth column: The seconds until the entry is invalidated.Fourth column: The transmission layer protocol number.Third column: The transmission layer protocol name (eg.Second column: The network layer protocol number.First column: The network layer protocol name (eg.The term layer refers to the OSI protocol layer model. I'll try to summarize the format of the latter file, as I understand it from the net/netfilter/nf_conntrack_standalone.c, net/netfilter/nf_conntrack_acct.c and the net/netfilter/nf_conntrack_proto_*.c kernel source files. The format of a line from /proc/net/ip_conntrack is the same as for /proc/net/nf_conntrack, except the first two columns are missing.
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