c9f9e0e159
I grepped through the code and picked bits about nf_conntrack sysctl api and put that into one documentation file. [ I have mangled this patch including comments from several grammar improvements proposed by Neal Murphy <neal.p.murphy@alum.wpi.edu>, any new grammar error is my mistake --pablo ] Signed-off-by: Jiri Pirko <jiri@resnulli.us> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
176 lines
4.8 KiB
Text
176 lines
4.8 KiB
Text
/proc/sys/net/netfilter/nf_conntrack_* Variables:
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nf_conntrack_acct - BOOLEAN
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0 - disabled (default)
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not 0 - enabled
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Enable connection tracking flow accounting. 64-bit byte and packet
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counters per flow are added.
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nf_conntrack_buckets - INTEGER (read-only)
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Size of hash table. If not specified as parameter during module
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loading, the default size is calculated by dividing total memory
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by 16384 to determine the number of buckets but the hash table will
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never have fewer than 32 or more than 16384 buckets.
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nf_conntrack_checksum - BOOLEAN
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0 - disabled
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not 0 - enabled (default)
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Verify checksum of incoming packets. Packets with bad checksums are
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in INVALID state. If this is enabled, such packets will not be
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considered for connection tracking.
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nf_conntrack_count - INTEGER (read-only)
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Number of currently allocated flow entries.
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nf_conntrack_events - BOOLEAN
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0 - disabled
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not 0 - enabled (default)
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If this option is enabled, the connection tracking code will
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provide userspace with connection tracking events via ctnetlink.
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nf_conntrack_events_retry_timeout - INTEGER (seconds)
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default 15
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This option is only relevant when "reliable connection tracking
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events" are used. Normally, ctnetlink is "lossy", that is,
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events are normally dropped when userspace listeners can't keep up.
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Userspace can request "reliable event mode". When this mode is
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active, the conntrack will only be destroyed after the event was
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delivered. If event delivery fails, the kernel periodically
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re-tries to send the event to userspace.
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This is the maximum interval the kernel should use when re-trying
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to deliver the destroy event.
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A higher number means there will be fewer delivery retries and it
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will take longer for a backlog to be processed.
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nf_conntrack_expect_max - INTEGER
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Maximum size of expectation table. Default value is
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nf_conntrack_buckets / 256. Minimum is 1.
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nf_conntrack_frag6_high_thresh - INTEGER
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default 262144
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Maximum memory used to reassemble IPv6 fragments. When
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nf_conntrack_frag6_high_thresh bytes of memory is allocated for this
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purpose, the fragment handler will toss packets until
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nf_conntrack_frag6_low_thresh is reached.
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nf_conntrack_frag6_low_thresh - INTEGER
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default 196608
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See nf_conntrack_frag6_low_thresh
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nf_conntrack_frag6_timeout - INTEGER (seconds)
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default 60
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Time to keep an IPv6 fragment in memory.
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nf_conntrack_generic_timeout - INTEGER (seconds)
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default 600
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Default for generic timeout. This refers to layer 4 unknown/unsupported
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protocols.
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nf_conntrack_helper - BOOLEAN
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0 - disabled
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not 0 - enabled (default)
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Enable automatic conntrack helper assignment.
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nf_conntrack_icmp_timeout - INTEGER (seconds)
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default 30
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Default for ICMP timeout.
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nf_conntrack_icmpv6_timeout - INTEGER (seconds)
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default 30
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Default for ICMP6 timeout.
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nf_conntrack_log_invalid - INTEGER
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0 - disable (default)
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1 - log ICMP packets
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6 - log TCP packets
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17 - log UDP packets
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33 - log DCCP packets
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41 - log ICMPv6 packets
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136 - log UDPLITE packets
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255 - log packets of any protocol
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Log invalid packets of a type specified by value.
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nf_conntrack_max - INTEGER
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Size of connection tracking table. Default value is
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nf_conntrack_buckets value * 4.
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nf_conntrack_tcp_be_liberal - BOOLEAN
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0 - disabled (default)
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not 0 - enabled
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Be conservative in what you do, be liberal in what you accept from others.
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If it's non-zero, we mark only out of window RST segments as INVALID.
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nf_conntrack_tcp_loose - BOOLEAN
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0 - disabled
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not 0 - enabled (default)
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If it is set to zero, we disable picking up already established
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connections.
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nf_conntrack_tcp_max_retrans - INTEGER
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default 3
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Maximum number of packets that can be retransmitted without
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received an (acceptable) ACK from the destination. If this number
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is reached, a shorter timer will be started.
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nf_conntrack_tcp_timeout_close - INTEGER (seconds)
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default 10
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nf_conntrack_tcp_timeout_close_wait - INTEGER (seconds)
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default 60
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nf_conntrack_tcp_timeout_established - INTEGER (seconds)
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default 432000 (5 days)
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nf_conntrack_tcp_timeout_fin_wait - INTEGER (seconds)
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default 120
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nf_conntrack_tcp_timeout_last_ack - INTEGER (seconds)
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default 30
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nf_conntrack_tcp_timeout_max_retrans - INTEGER (seconds)
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default 300
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nf_conntrack_tcp_timeout_syn_recv - INTEGER (seconds)
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default 60
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nf_conntrack_tcp_timeout_syn_sent - INTEGER (seconds)
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default 120
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nf_conntrack_tcp_timeout_time_wait - INTEGER (seconds)
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default 120
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nf_conntrack_tcp_timeout_unacknowledged - INTEGER (seconds)
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default 300
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nf_conntrack_timestamp - BOOLEAN
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0 - disabled (default)
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not 0 - enabled
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Enable connection tracking flow timestamping.
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nf_conntrack_udp_timeout - INTEGER (seconds)
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default 30
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nf_conntrack_udp_timeout_stream2 - INTEGER (seconds)
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default 180
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This extended timeout will be used in case there is an UDP stream
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detected.
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