IBM 6.1.X manual N U T W O R K T U N I N G

L I N U X

N E T W O R K T U N I N G

For Red Hat Linux and z/Linux (Suse Linux on zOS), we add the following settings to file /etc/sysctl.conf, then run the command: sysctl -p

To inspect current TCP parameters, run the command: sysctl -a fgrep tcp

Table 12: Linux Network Settings

Parameter	Value
net.ipv4.ip_forward	0
net.ipv4.conf.default.rp_filter	1
net.ipv4.conf.default.accept_source_route	0
net.core.rmem_max	16777216
net.core.wmem_max	16777216
net.ipv4.tcp_rmem	4096 87380 16777216
net.ipv4.tcp_wmem	4096 65536 16777216
net.ipv4.tcp_fin_timeout	30
net.core.netdev_max_backlog	3000
net.core.somaxconn	10000
net.ipv4.tcp_keepalive_intvl	15
net.ipv4.tcp_keepalive_probes	5

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N E T W O R K T U N I N G

Use the regedit command, the following registry settings were made in the section

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\

Tcpip\Parameters. Create a new REG_DWORD named below.

Table 13: Windows Network Settings

Parameter		Value
MaxFreeTcbs		dword:00011940
MaxHashTableSize		dword:0000ffff
MaxUserPort		dword:0000fffe
TcpTimedWaitDelay		dword:0000001e
TcpWindowSize		dword:0000ffff (65535)
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	W E BS P HE R E P O R T AL V 6 . 1 T U N I N G G U I D E