Hi Can I ask the question? What is the latest CentOS to use the TCP scaling window algorithm to the RFC? When I use this CentOs as router, ls there any problem? Thank you --- Mark Hull-Richter <mhullrich at gmail.com> wrote: > On Tue, 2007-11-13 at 11:54 -0500, Ross S. W. Walker > wrote: > > > 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. > > mhr > > > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos > ____________________________________________________________________________________ Never miss a thing. Make Yahoo your home page. http://www.yahoo.com/r/hs