Server oriented optimalization. Be careful this is not 100% RFC compatible, but working nice on my servers

echo “32767″ >/proc/sys/net/ipv4/tcp_max_tw_buckets_ub
echo “1024 65000″ >/proc/sys/net/ipv4/ip_local_port_range
echo “250 32000 100 128″ >/proc/sys/kernel/sem
echo “65536″ >/proc/sys/net/ipv4/tcp_max_orphans
echo “4096 87380 16777216″ >/proc/sys/net/ipv4/tcp_rmem
echo “4096 65536 16777216″ >/proc/sys/net/ipv4/tcp_wmem
echo “16777216″ >/proc/sys/net/core/rmem_max
echo “16777216″ >/proc/sys/net/core/wmem_max
echo “262144″ >/proc/sys/net/core/netdev_max_backlog
echo “15″>/proc/sys/net/ipv4/tcp_fin_timeout
echo “1″ >/proc/sys/net/ipv4/icmp_echo_ignore_broadcasts
echo “1″ >/proc/sys/net/ipv4/icmp_echo_ignore_all
echo “1″ >/proc/sys/net/ipv4/
icmp_ignore_bogus_error_responses
echo “1″ >/proc/sys/net/ipv4/ip_no_pmtu_disc
echo “0″ >/proc/sys/net/ipv4/tcp_rfc1337
echo “1″ >/proc/sys/net/ipv4/tcp_orphan_retries
echo “1″ >/proc/sys/net/ipv4/tcp_tw_recycle
echo “1″ >/proc/sys/net/ipv4/tcp_tw_reuse
echo “10″>/proc/sys/net/ipv4/tcp_keepalive_intvl
echo “2″ >/proc/sys/net/ipv4/tcp_keepalive_probes
echo “0″ >/proc/sys/net/ipv4/tcp_sack
echo “0″ >/proc/sys/net/ipv4/tcp_timestamps
echo “0″ >/proc/sys/net/ipv4/tcp_window_scaling
echo “30″>/proc/sys/net/ipv4/tcp_keepalive_time
echo “65536″ >/proc/sys/fs/file-max
ulimit -n 65536
ifconfig eth0 txqueuelen 2000
ifconfig eth0 mtu 1400

// lower MTU for some connections, possible values are
// 1400 (safe), 1436, 1492
// 9000 for 1GBit connections (for less interrupts per second :-)

Realtek RTL8186 Datasheet v0.95

// eth0 – interface connected directly to 5-port switch
// eth1 – interface WAN
// wlan0 – wifi minipci directly connected to IC
// maximum transmit thru NAT-router 18Mbit/s
// maximum transmit thru wireless device 23Mbit/s WIFI (54g)
// maximum transmit thru bridge 52Mbit/s (WAN-LAN)
// measured latency thru linux router 1ms
// RTL8305SC Switch
// — maximum throughput in switch 91Mbit/s (halfduplex port-port)
// — maximum throughput in switch 160Mbit-s (fullduplex port-port)
// CPU – MIPS R3000 clone 180Mhz
// better to use AES WPA2 than any other because of HW acceleration

TUNING PARAMETERS IN BASH —

iwpriv wlan0 set_mib disable_olbc=1
iwpriv wlan0 set_mib ack_timeout=22
ifconfig eth0 txqueuelen 32
ifconfig eth1 txqueuelen 32
ifconfig br0 txqueuelen 32
ifconfig wlan0 txqueuelen 32
echo "0 0">/proc/sys/vm/pagetable_cache
echo "0" >/proc/sys/vm/max-readahead
echo "0" >/proc/sys/vm/min-readahead
echo "200">/proc/sys/net/core/netdev_max_backlog
echo "50" >/proc/sys/net/core/mod_cong
echo "30" >/proc/sys/net/core/lo_cong
echo "10" >/proc/sys/net/core/no_cong
echo "131072" >/proc/sys/net/core/wmem_max
echo "131072" >/proc/sys/net/core/rmem_max
echo "0" >/proc/sys/net/ipv4/tcp_retrans_collapse
echo "0" >/proc/sys/net/ipv4/tcp_timestamps
echo "0" >/proc/sys/net/ipv4/tcp_window_scaling
echo "0" >/proc/sys/net/ipv4/tcp_sack
echo "1" >/proc/sys/net/ipv4/ip_no_pmtu_disc
echo "30" >/proc/sys/net/ipv4/tcp_keepalive_time
echo "2" >/proc/sys/net/ipv4/tcp_keepalive_probes
echo "10" >/proc/sys/net/ipv4/tcp_keepalive_intvl
echo "15" >/proc/sys/net/ipv4/tcp_fin_timeout
echo "1" >/proc/sys/net/ipv4/tcp_tw_recycle
echo "0" >/proc/sys/net/ipv4/tcp_rfc1337
echo "1024 4096" >/proc/sys/net/ipv4/ip_local_port_range
echo "1" >/proc/sys/net/ipv4/icmp_echo_ignore_all
echo "1" >/proc/sys/net/ipv4/icmp_echo_ignore_broadcasts
echo "1" >/proc/sys/net/ipv4/icmp_ignore_bogus_error_responses
echo "4096 65536 131072" >/proc/sys/net/ipv4/tcp_wmem
echo "4096 87378 131072" >/proc/sys/net/ipv4/tcp_rmem
echo "0" >/proc/sys/net/ipv4/conf/all/accept_source_route
echo "0" >/proc/sys/net/ipv4/conf/all/accept_redirects
echo "1" >/proc/sys/net/ipv4/conf/all/rp_filter
echo "0" >/proc/sys/net/ipv4/conf/default/accept_source_route
echo "0" >/proc/sys/net/ipv4/conf/default/accept_redirects
echo "1" >/proc/sys/net/ipv4/conf/default/rp_filter
echo "1800">/proc/sys/net/ipv4/netfilter/ip_conntrack_tcp_timeout_established
echo "300">/proc/sys/net/ipv4/netfilter/ip_conntrack_generic_timeout
echo "60" >/proc/sys/net/ipv4/netfilter/ip_conntrack_tcp_timeout_close_wait
echo "30" >/proc/sys/net/ipv4/netfilter/ip_conntrack_tcp_timeout_syn_recv
echo "60" >/proc/sys/net/ipv4/netfilter/ip_conntrack_tcp_timeout_syn_sent
echo "30" >/proc/sys/net/ipv4/netfilter/ip_conntrack_tcp_timeout_time_wait
echo "60" >/proc/sys/net/ipv4/netfilter/ip_conntrack_tcp_timeout_fin_wait
echo "5" >/proc/sys/net/ipv4/netfilter/ip_conntrack_tcp_timeout_close
echo "4096">/proc/sys/net/ipv4/route/max_size
echo "2048">/proc/sys/net/ipv4/route/gc_thresh

TUNING PARAMETERS IN BASH —

// Select “G Mode only” in configuration
// Beacon Interval 800ms
// ACK Timeout 22μsec (up to 300 meters) or 91μsec (long distance)
// Short Preamble
// 802.11g Protection – Disabled