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Linux gator3171.hostgator.com 4.19.286-203.ELK.el7.x86_64 #1 SMP Wed Jun 14 04:33:55 CDT 2023 x86_64 |
| Current File : //etc/conntrackd/conntrackd.conf |
# See also: http://conntrack-tools.netfilter.org/support.html
#
# There are 3 different modes of running conntrackd: "alarm", "notrack" and "ftfw"
#
# The default package ships with a FTFW configuration, see /usr/share/doc/conntrackd*
# for example configurations for other modes.
#
# Synchronizer settings
#
Sync {
Mode FTFW {
#
# Size of the resend queue (in objects). This is the maximum
# number of objects that can be stored waiting to be confirmed
# via acknoledgment. If you keep this value low, the daemon
# will have less chances to recover state-changes under message
# omission. On the other hand, if you keep this value high,
# the daemon will consume more memory to store dead objects.
# Default is 131072 objects.
#
# ResendQueueSize 131072
#
# This parameter allows you to set an initial fixed timeout
# for the committed entries when this node goes from backup
# to primary. This mechanism provides a way to purge entries
# that were not recovered appropriately after the specified
# fixed timeout. If you set a low value, TCP entries in
# Established states with no traffic may hang. For example,
# an SSH connection without KeepAlive enabled. If not set,
# the daemon uses an approximate timeout value calculation
# mechanism. By default, this option is not set.
#
# CommitTimeout 180
#
# If the firewall replica goes from primary to backup,
# the conntrackd -t command is invoked in the script.
# This command schedules a flush of the table in N seconds.
# This is useful to purge the connection tracking table of
# zombie entries and avoid clashes with old entries if you
# trigger several consecutive hand-overs. Default is 60 seconds.
#
# PurgeTimeout 60
# Set the acknowledgement window size. If you decrease this
# value, the number of acknowlegdments increases. More
# acknowledgments means more overhead as conntrackd has to
# handle more control messages. On the other hand, if you
# increase this value, the resend queue gets more populated.
# This results in more overhead in the queue releasing.
# The following value is based on some practical experiments
# measuring the cycles spent by the acknowledgment handling
# with oprofile. If not set, default window size is 300.
#
# ACKWindowSize 300
#
# This clause allows you to disable the external cache. Thus,
# the state entries are directly injected into the kernel
# conntrack table. As a result, you save memory in user-space
# but you consume slots in the kernel conntrack table for
# backup state entries. Moreover, disabling the external cache
# means more CPU consumption. You need a Linux kernel
# >= 2.6.29 to use this feature. By default, this clause is
# set off. If you are installing conntrackd for first time,
# please read the user manual and I encourage you to consider
# using the fail-over scripts instead of enabling this option!
#
# DisableExternalCache Off
}
#
# Multicast IP and interface where messages are
# broadcasted (dedicated link). IMPORTANT: Make sure
# that iptables accepts traffic for destination
# 225.0.0.50, eg:
#
# iptables -I INPUT -d 225.0.0.50 -j ACCEPT
# iptables -I OUTPUT -d 225.0.0.50 -j ACCEPT
#
Multicast {
#
# Multicast address: The address that you use as destination
# in the synchronization messages. You do not have to add
# this IP to any of your existing interfaces. If any doubt,
# do not modify this value.
#
IPv4_address 225.0.0.50
#
# The multicast group that identifies the cluster. If any
# doubt, do not modify this value.
#
Group 3780
#
# IP address of the interface that you are going to use to
# send the synchronization messages. Remember that you must
# use a dedicated link for the synchronization messages.
#
IPv4_interface 192.168.100.100
#
# The name of the interface that you are going to use to
# send the synchronization messages.
#
Interface eth2
# The multicast sender uses a buffer to enqueue the packets
# that are going to be transmitted. The default size of this
# socket buffer is available at /proc/sys/net/core/wmem_default.
# This value determines the chances to have an overrun in the
# sender queue. The overrun results packet loss, thus, losing
# state information that would have to be retransmitted. If you
# notice some packet loss, you may want to increase the size
# of the sender buffer. The default size is usually around
# ~100 KBytes which is fairly small for busy firewalls.
#
SndSocketBuffer 1249280
# The multicast receiver uses a buffer to enqueue the packets
# that the socket is pending to handle. The default size of this
# socket buffer is available at /proc/sys/net/core/rmem_default.
# This value determines the chances to have an overrun in the
# receiver queue. The overrun results packet loss, thus, losing
# state information that would have to be retransmitted. If you
# notice some packet loss, you may want to increase the size of
# the receiver buffer. The default size is usually around
# ~100 KBytes which is fairly small for busy firewalls.
#
RcvSocketBuffer 1249280
#
# Enable/Disable message checksumming. This is a good
# property to achieve fault-tolerance. In case of doubt, do
# not modify this value.
#
Checksum on
}
#
# You can specify more than one dedicated link. Thus, if one dedicated
# link fails, conntrackd can fail-over to another. Note that adding
# more than one dedicated link does not mean that state-updates will
# be sent to all of them. There is only one active dedicated link at
# a given moment. The `Default' keyword indicates that this interface
# will be selected as the initial dedicated link. You can have
# up to 4 redundant dedicated links. Note: Use different multicast
# groups for every redundant link.
#
# Multicast Default {
# IPv4_address 225.0.0.51
# Group 3781
# IPv4_interface 192.168.100.101
# Interface eth3
# # SndSocketBuffer 1249280
# # RcvSocketBuffer 1249280
# Checksum on
# }
#
# You can use Unicast UDP instead of Multicast to propagate events.
# Note that you cannot use unicast UDP and Multicast at the same
# time, you can only select one.
#
# UDP {
#
# UDP address that this firewall uses to listen to events.
#
# IPv4_address 192.168.2.100
#
# or you may want to use an IPv6 address:
#
# IPv6_address fe80::215:58ff:fe28:5a27
#
# Destination UDP address that receives events, ie. the other
# firewall's dedicated link address.
#
# IPv4_Destination_Address 192.168.2.101
#
# or you may want to use an IPv6 address:
#
# IPv6_Destination_Address fe80::2d0:59ff:fe2a:775c
#
# UDP port used
#
# Port 3780
#
# The name of the interface that you are going to use to
# send the synchronization messages.
#
# Interface eth2
#
# The sender socket buffer size
#
# SndSocketBuffer 1249280
#
# The receiver socket buffer size
#
# RcvSocketBuffer 1249280
#
# Enable/Disable message checksumming.
#
# Checksum on
# }
#
# Other unsorted options that are related to the synchronization.
#
# Options {
#
# TCP state-entries have window tracking disabled by default,
# you can enable it with this option. As said, default is off.
# This feature requires a Linux kernel >= 2.6.36.
#
# TCPWindowTracking Off
# }
}
#
# General settings
#
General {
#
# Set the nice value of the daemon, this value goes from -20
# (most favorable scheduling) to 19 (least favorable). Using a
# very low value reduces the chances to lose state-change events.
# Default is 0 but this example file sets it to most favourable
# scheduling as this is generally a good idea. See man nice(1) for
# more information.
#
Nice -20
#
# Select a different scheduler for the daemon, you can select between
# RR and FIFO and the process priority (minimum is 0, maximum is 99).
# See man sched_setscheduler(2) for more information. Using a RT
# scheduler reduces the chances to overrun the Netlink buffer.
#
# Scheduler {
# Type FIFO
# Priority 99
# }
#
# Number of buckets in the cache hashtable. The bigger it is,
# the closer it gets to O(1) at the cost of consuming more memory.
# Read some documents about tuning hashtables for further reference.
#
HashSize 32768
#
# Maximum number of conntracks, it should be double of:
# $ cat /proc/sys/net/netfilter/nf_conntrack_max
# since the daemon may keep some dead entries cached for possible
# retransmission during state synchronization.
#
HashLimit 131072
#
# Logfile: on (/var/log/conntrackd.log), off, or a filename
# Default: off
#
LogFile on
#
# Syslog: on, off or a facility name (daemon (default) or local0..7)
# Default: off
#
#Syslog on
#
# Lockfile
#
LockFile /var/lock/conntrack.lock
#
# Unix socket configuration
#
UNIX {
Path /var/run/conntrackd.ctl
Backlog 20
}
#
# Netlink event socket buffer size. If you do not specify this clause,
# the default buffer size value in /proc/net/core/rmem_default is
# used. This default value is usually around 100 Kbytes which is
# fairly small for busy firewalls. This leads to event message dropping
# and high CPU consumption. This example configuration file sets the
# size to 2 MBytes to avoid this sort of problems.
#
NetlinkBufferSize 2097152
#
# The daemon doubles the size of the netlink event socket buffer size
# if it detects netlink event message dropping. This clause sets the
# maximum buffer size growth that can be reached. This example file
# sets the size to 8 MBytes.
#
NetlinkBufferSizeMaxGrowth 8388608
#
# If the daemon detects that Netlink is dropping state-change events,
# it automatically schedules a resynchronization against the Kernel
# after 30 seconds (default value). Resynchronizations are expensive
# in terms of CPU consumption since the daemon has to get the full
# kernel state-table and purge state-entries that do not exist anymore.
# Be careful of setting a very small value here. You have the following
# choices: On (enabled, use default 30 seconds value), Off (disabled)
# or Value (in seconds, to set a specific amount of time). If not
# specified, the daemon assumes that this option is enabled.
#
# NetlinkOverrunResync On
#
# If you want reliable event reporting over Netlink, set on this
# option. If you set on this clause, it is a good idea to set off
# NetlinkOverrunResync. This option is off by default and you need
# a Linux kernel >= 2.6.31.
#
# NetlinkEventsReliable Off
#
# By default, the daemon receives state updates following an
# event-driven model. You can modify this behaviour by switching to
# polling mode with the PollSecs clause. This clause tells conntrackd
# to dump the states in the kernel every N seconds. With regards to
# synchronization mode, the polling mode can only guarantee that
# long-lifetime states are recovered. The main advantage of this method
# is the reduction in the state replication at the cost of reducing the
# chances of recovering connections.
#
# PollSecs 15
#
# The daemon prioritizes the handling of state-change events coming
# from the core. With this clause, you can set the maximum number of
# state-change events (those coming from kernel-space) that the daemon
# will handle after which it will handle other events coming from the
# network or userspace. A low value improves interactivity (in terms of
# real-time behaviour) at the cost of extra CPU consumption.
# Default (if not set) is 100.
#
# EventIterationLimit 100
#
# Event filtering: This clause allows you to filter certain traffic,
# There are currently three filter-sets: Protocol, Address and
# State. The filter is attached to an action that can be: Accept or
# Ignore. Thus, you can define the event filtering policy of the
# filter-sets in positive or negative logic depending on your needs.
# You can select if conntrackd filters the event messages from
# user-space or kernel-space. The kernel-space event filtering
# saves some CPU cycles by avoiding the copy of the event message
# from kernel-space to user-space. The kernel-space event filtering
# is prefered, however, you require a Linux kernel >= 2.6.29 to
# filter from kernel-space. If you want to select kernel-space
# event filtering, use the keyword 'Kernelspace' instead of
# 'Userspace'.
#
Filter From Userspace {
#
# Accept only certain protocols: You may want to replicate
# the state of flows depending on their layer 4 protocol.
#
Protocol Accept {
TCP
SCTP
DCCP
# UDP
# ICMP # This requires a Linux kernel >= 2.6.31
# IPv6-ICMP # This requires a Linux kernel >= 2.6.31
}
#
# Ignore traffic for a certain set of IP's: Usually all the
# IP assigned to the firewall since local traffic must be
# ignored, only forwarded connections are worth to replicate.
# Note that these values depends on the local IPs that are
# assigned to the firewall.
#
Address Ignore {
IPv4_address 127.0.0.1 # loopback
IPv4_address 192.168.0.100 # virtual IP 1
IPv4_address 192.168.1.100 # virtual IP 2
IPv4_address 192.168.0.1
IPv4_address 192.168.1.1
IPv4_address 192.168.100.100 # dedicated link ip
#
# You can also specify networks in format IP/cidr.
# IPv4_address 192.168.0.0/24
#
# You can also specify an IPv6 address
# IPv6_address ::1
}
#
# Uncomment this line below if you want to filter by flow state.
# This option introduces a trade-off in the replication: it
# reduces CPU consumption at the cost of having lazy backup
# firewall replicas. The existing TCP states are: SYN_SENT,
# SYN_RECV, ESTABLISHED, FIN_WAIT, CLOSE_WAIT, LAST_ACK,
# TIME_WAIT, CLOSED, LISTEN.
#
# State Accept {
# ESTABLISHED CLOSED TIME_WAIT CLOSE_WAIT for TCP
# }
}
}