13df433f8c
- add SPDX header; - add a document title; - mark lists as such; - add to networking/index.rst. Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
179 lines
4.8 KiB
ReStructuredText
179 lines
4.8 KiB
ReStructuredText
.. SPDX-License-Identifier: GPL-2.0
|
|
|
|
===================================
|
|
Netfilter Conntrack Sysfs variables
|
|
===================================
|
|
|
|
/proc/sys/net/netfilter/nf_conntrack_* Variables:
|
|
=================================================
|
|
|
|
nf_conntrack_acct - BOOLEAN
|
|
- 0 - disabled (default)
|
|
- not 0 - enabled
|
|
|
|
Enable connection tracking flow accounting. 64-bit byte and packet
|
|
counters per flow are added.
|
|
|
|
nf_conntrack_buckets - INTEGER
|
|
Size of hash table. If not specified as parameter during module
|
|
loading, the default size is calculated by dividing total memory
|
|
by 16384 to determine the number of buckets but the hash table will
|
|
never have fewer than 32 and limited to 16384 buckets. For systems
|
|
with more than 4GB of memory it will be 65536 buckets.
|
|
This sysctl is only writeable in the initial net namespace.
|
|
|
|
nf_conntrack_checksum - BOOLEAN
|
|
- 0 - disabled
|
|
- not 0 - enabled (default)
|
|
|
|
Verify checksum of incoming packets. Packets with bad checksums are
|
|
in INVALID state. If this is enabled, such packets will not be
|
|
considered for connection tracking.
|
|
|
|
nf_conntrack_count - INTEGER (read-only)
|
|
Number of currently allocated flow entries.
|
|
|
|
nf_conntrack_events - BOOLEAN
|
|
- 0 - disabled
|
|
- not 0 - enabled (default)
|
|
|
|
If this option is enabled, the connection tracking code will
|
|
provide userspace with connection tracking events via ctnetlink.
|
|
|
|
nf_conntrack_expect_max - INTEGER
|
|
Maximum size of expectation table. Default value is
|
|
nf_conntrack_buckets / 256. Minimum is 1.
|
|
|
|
nf_conntrack_frag6_high_thresh - INTEGER
|
|
default 262144
|
|
|
|
Maximum memory used to reassemble IPv6 fragments. When
|
|
nf_conntrack_frag6_high_thresh bytes of memory is allocated for this
|
|
purpose, the fragment handler will toss packets until
|
|
nf_conntrack_frag6_low_thresh is reached.
|
|
|
|
nf_conntrack_frag6_low_thresh - INTEGER
|
|
default 196608
|
|
|
|
See nf_conntrack_frag6_low_thresh
|
|
|
|
nf_conntrack_frag6_timeout - INTEGER (seconds)
|
|
default 60
|
|
|
|
Time to keep an IPv6 fragment in memory.
|
|
|
|
nf_conntrack_generic_timeout - INTEGER (seconds)
|
|
default 600
|
|
|
|
Default for generic timeout. This refers to layer 4 unknown/unsupported
|
|
protocols.
|
|
|
|
nf_conntrack_helper - BOOLEAN
|
|
- 0 - disabled (default)
|
|
- not 0 - enabled
|
|
|
|
Enable automatic conntrack helper assignment.
|
|
If disabled it is required to set up iptables rules to assign
|
|
helpers to connections. See the CT target description in the
|
|
iptables-extensions(8) man page for further information.
|
|
|
|
nf_conntrack_icmp_timeout - INTEGER (seconds)
|
|
default 30
|
|
|
|
Default for ICMP timeout.
|
|
|
|
nf_conntrack_icmpv6_timeout - INTEGER (seconds)
|
|
default 30
|
|
|
|
Default for ICMP6 timeout.
|
|
|
|
nf_conntrack_log_invalid - INTEGER
|
|
- 0 - disable (default)
|
|
- 1 - log ICMP packets
|
|
- 6 - log TCP packets
|
|
- 17 - log UDP packets
|
|
- 33 - log DCCP packets
|
|
- 41 - log ICMPv6 packets
|
|
- 136 - log UDPLITE packets
|
|
- 255 - log packets of any protocol
|
|
|
|
Log invalid packets of a type specified by value.
|
|
|
|
nf_conntrack_max - INTEGER
|
|
Size of connection tracking table. Default value is
|
|
nf_conntrack_buckets value * 4.
|
|
|
|
nf_conntrack_tcp_be_liberal - BOOLEAN
|
|
- 0 - disabled (default)
|
|
- not 0 - enabled
|
|
|
|
Be conservative in what you do, be liberal in what you accept from others.
|
|
If it's non-zero, we mark only out of window RST segments as INVALID.
|
|
|
|
nf_conntrack_tcp_loose - BOOLEAN
|
|
- 0 - disabled
|
|
- not 0 - enabled (default)
|
|
|
|
If it is set to zero, we disable picking up already established
|
|
connections.
|
|
|
|
nf_conntrack_tcp_max_retrans - INTEGER
|
|
default 3
|
|
|
|
Maximum number of packets that can be retransmitted without
|
|
received an (acceptable) ACK from the destination. If this number
|
|
is reached, a shorter timer will be started.
|
|
|
|
nf_conntrack_tcp_timeout_close - INTEGER (seconds)
|
|
default 10
|
|
|
|
nf_conntrack_tcp_timeout_close_wait - INTEGER (seconds)
|
|
default 60
|
|
|
|
nf_conntrack_tcp_timeout_established - INTEGER (seconds)
|
|
default 432000 (5 days)
|
|
|
|
nf_conntrack_tcp_timeout_fin_wait - INTEGER (seconds)
|
|
default 120
|
|
|
|
nf_conntrack_tcp_timeout_last_ack - INTEGER (seconds)
|
|
default 30
|
|
|
|
nf_conntrack_tcp_timeout_max_retrans - INTEGER (seconds)
|
|
default 300
|
|
|
|
nf_conntrack_tcp_timeout_syn_recv - INTEGER (seconds)
|
|
default 60
|
|
|
|
nf_conntrack_tcp_timeout_syn_sent - INTEGER (seconds)
|
|
default 120
|
|
|
|
nf_conntrack_tcp_timeout_time_wait - INTEGER (seconds)
|
|
default 120
|
|
|
|
nf_conntrack_tcp_timeout_unacknowledged - INTEGER (seconds)
|
|
default 300
|
|
|
|
nf_conntrack_timestamp - BOOLEAN
|
|
- 0 - disabled (default)
|
|
- not 0 - enabled
|
|
|
|
Enable connection tracking flow timestamping.
|
|
|
|
nf_conntrack_udp_timeout - INTEGER (seconds)
|
|
default 30
|
|
|
|
nf_conntrack_udp_timeout_stream - INTEGER (seconds)
|
|
default 120
|
|
|
|
This extended timeout will be used in case there is an UDP stream
|
|
detected.
|
|
|
|
nf_conntrack_gre_timeout - INTEGER (seconds)
|
|
default 30
|
|
|
|
nf_conntrack_gre_timeout_stream - INTEGER (seconds)
|
|
default 180
|
|
|
|
This extended timeout will be used in case there is an GRE stream
|
|
detected.
|