[CentOS] OT: Slow browsers or slow connections?
annkok2001 at yahoo.com
Wed Nov 14 19:58:13 UTC 2007
Can I ask the question?
What is the latest CentOS to use the TCP scaling
algorithm to the RFC?
When I use this CentOs as router, ls there any
--- Mark Hull-Richter <mhullrich at gmail.com> wrote:
> On Tue, 2007-11-13 at 11:54 -0500, Ross S. W. Walker
> > 3 possible scenarios:
> > 1) DNS not properly configured
> > Make sure your resolv.conf is properly configured,
> if you are doing
> > DHCP look into having your resolv.conf set through
> it, if you are
> > using PPPOE you can have the ppp daemon set it too
> if the DNS is
> > passed over the ppp connection.
> Don't have a resolve.conf.
> > 2) TCP MTU and blackhole router if PPPOE
> > If you are doing PPPOE then make sure the MTU on
> the ppp interface
> > link is set to 1492 as pppoe uses 8 bytes for ppp
> framing. If it is
> > set to 1500 then some large packets will drop and
> the stack will
> > have to resend smaller and smaller till it goes
> through. If ICMP
> > need to frag messages are dropped then the
> connections will stall
> > completely.
> 1492, by default.
> > 3) TCP scaling window and broken router
> > The latest CentOS uses the TCP scaling window
> algorithm to the RFC
> > spec which some routers don't support. Some people
> have noticed
> > that this solves the problem when communicating to
> other hosts
> > over the Internet.
> > sysctl -w net.ipv4.tcp_window_scaling=0
> I tried it - will see. BTW, this wouldn't muck up
> my keyboard
> shortcuts, would it? I noticed that after I
> executed this, some of them
> stopped working - again.
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