Speed ​​Internet Connection in Linux Ubuntu

Speed ​​internet connection in linux ubuntu can be improved in many ways. One of them by optimizing the basic settings. So you can increase speed ​​internet connection without any software. How it works together to improve the internet connection between linux ubuntu with windows 7. This arrangement will maximize internet connection. And the result, internet connection speeds have increased from the previous.
Settings to increase speed ​​internet connection in linux ubuntu :

$sudo gedit /etc/sysctl.conf
#net.ipv4.conf.default.rp_filter=1
#net.ipv4.conf.all.rp_filter=1
#net.ipv4.tcp_syncookies=1
#net.ipv4.ip_forward=1
#net.ipv6.conf.all.forwarding=1
#net.ipv4.conf.all.secure_redirects = 1
#net.ipv4.conf.all.log_martians = 1
#net.core.rmem_max = 16777216
#net.core.wmem_max = 16777216
#net.ipv4.tcp_rmem = 87380
#net.ipv4.tcp_wmem = 87380
#net.ipv4.tcp_no_metrics_save = 1
#net.ipv4.tcp_moderate_rcvbuf = 1
#net.core.netdev_max_backlog = 2500
#net.core.netdev_max_backlog = 30000
#net.ipv4.tcp_timestamps = 0
#net.ipv4.tcp_sack = 0
#net.ipv4.tcp_window_scaling = 1
#net.ipv4.tcp_fin_timeout = 60
#net.ipv4.tcp_retries1 = 3
#net.ipv4.tcp_keepalive_probes = 9
#net.ipv4.tcp_keepalive_time = 7200
#net.ipv4.tcp_syn_retries = 5

$sudo gedit /etc/network/interfaces
auto lo
iface lo inet loopback

$sudo gedit /etc/ppp/ip-up
$3   The link speed    115200

$sudo gedit /etc/ppp/ip-down
$3   The link speed    115200

$sudo gedit /etc/nsswitch.conf
hosts: files mdns4_minimal [NOTFOUND=return] dns mdns4
hosts: files dns