How do you optimize TCP window size in Linux?
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Joe Duncan
Systems
Human Resources Development Canada
(613)997-7986
[EMAIL PROTECTED]
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Original Text
From: "David A. Ranch" <[EMAIL PROTECTED]>, on 02/09/98 9:13 pm:
>The question is "Should I expect a big hit in performance with using
>ipmasquerading with a fast cable modem"?
You probably haven't optimized your TCP window size in Linux.
Why this isn't set as default on ALL Linux distributions beats me.
Please let us know if this helps!
Also.. if you are using a strong IPFWADM ruleset, you rules might
not be properly ordered.
--David
>From [Section 15] of
http://www.ecst.csuchico.edu/~dranch/LINUX/TrinityOS.wri
NOTE: This is from a new version of TrinityOS that hasn't
been put up yet. The old version didn't account for
the init-scripts RPM changing the /sbin/ip-up file.
--
Network Optimization:
Both Slackware and Redhat, out of the box, do NOT optimize the TCP/IP
window size. This can make a BIG difference with performance:
Redhat5:
NOTE: Users that have NOT installed the initscripts-3.67-1.i386.rpm
patch RPM, the correct line numbers will be 119 and 134.
Personally, I recommend that you just install the RPM NOW!
Edit "/etc/sysconfig/network-scripts/ifup" and around
lines 134, 136, and 149, find the lines:
"route add -net ${NETWORK} netmask ${NETMASK} ${DEVICE}"
and
"route add -host ${IPADDR} ${DEVICE}"
and
"route add default gw ${GATEWAY} ${DEVICE}"
and change them to:
"route add -net ${NETWORK} netmask ${NETMASK} window 8192
${DEVICE}"
and
"route add -host ${IPADDR} window 8192 ${DEVICE}"
and
"route add default gw ${GATEWAY} window 8192 ${DEVICE}"
Slackware:
Edit /etc/rc.d/rc.inet1" and around lines 47 and 49, find the
following text (note: your setup might look a little different
so make any changes that are needed for your setup)
"/sbin/route add -net ${NETWORK} netmask ${NETMASK} eth0"
and
"if [ ! "$GATEWAY" = "" ]; then
/sbin/route add default gw ${GATEWAY} netmask 0.0.0.0 metric 1
fi"
and replace them with the following:
"/sbin/route add -net ${NETWORK} netmask ${NETMASK} window 8192
eth0"
and
"if [ ! "$GATEWAY" = "" ]; then
/sbin/route add default gw ${GATEWAY} netmask 0.0.0.0 window
8192 metric 1
fi"
.---------------------------------------------------------------------------
-.
| David A. Ranch - Remote Access/Linux/PC hardware [EMAIL PROTECTED]
|
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