sysctl.conf

# Uncomment the next line to enable packet forwarding for IPv4
net.ipv4.ip_forward=1

# Uncomment the next line to enable packet forwarding for IPv6
#  Enabling this option disables Stateless Address Autoconfiguration
#  based on Router Advertisements for this host
net.ipv6.conf.all.forwarding=1
net.ipv4.conf.all.proxy_arp = 1
net.core.netdev_max_backlog = 250000



# Usually SIP uses TCP or UDP to carry the SIP signaling messages over the internet (<=> TCP/UDP sockets).
# The receive buffer (socket receive buffer) holds the received data until it is read by the application.
# The send buffer (socket transmit buffer) holds the data until it is read by the underling protocol in the network stack.

#net.core.rmem_max = 10485760
#net.core.rmem_max = 12582912
#net.core.rmem_max = 33554432
net.core.rmem_max = 67108864

#net.core.wmem_max = 10485760
#net.core.wmem_max = 12582912
net.core.wmem_max = 33554432

#net.core.rmem_default = 10485760
net.core.rmem_default = 31457280
#net.core.wmem_default = 10485760
net.core.wmem_default = 31457280

net.ipv4.tcp_rmem = 10240 87380 10485760
net.ipv4.tcp_wmem= 10240 87380 10485760

# Increase the write-buffer-space allocatable
net.ipv4.udp_rmem_min = 131072
net.ipv4.udp_wmem_min = 131072
# net.ipv4.udp_mem = 65536 131072 262144
net.ipv4.udp_mem = 19257652 19257652 19257652
net.ipv4.tcp_mem = 786432 1048576 26777216

# Increase the maximum amount of option memory buffers
net.core.optmem_max = 25165824



# Set the value of somaxconn. This is the Max value of the backlog. The default value is 128.
# If the backlog is greater than somaxconn, it will truncated to it.
net.core.somaxconn = 65535

# The kernel parameter "netdev_max_backlog" is the maximum size of the receive queue.
net.core.netdev_max_backlog = 300000


# change the maximum number of open files
# be sure that /proc/sys/fs/inode-max is 3-4 times the new value of
# /proc/sys/fs/file-max, or you will run out of inodes.
# The upper limit on fs.file-max is recorded in fs.nr_open (which is 1024*1024)
fs.file-max = 500000

# The value 0 makes the kernel swap only to avoid out of memory condition.
# Do less swapping
vm.swappiness = 10
vm.dirty_ratio = 60
vm.dirty_background_ratio = 2

# The default operating system limits on mmap counts is likely to be too low
# used by vmtouch
vm.max_map_count=262144

# the maximum size (in bytes) of a single shared segment that a Linux process can allocate in its virtual address space.
# 1/2 of physical RAM,  shared memory segment theoretically is 2^64bytes. This is correspond to all physical RAM that you have.
kernel.shmmax = 1073741824

# total port range
net.ipv4.ip_local_port_range = 1024 65535


# fast fast fast
net.ipv4.tcp_fastopen = 3

# bbr 
net.core.default_qdisc=fq
net.ipv4.tcp_congestion_control=bbr