[Lugge] Re: Kernel & TCP

  • From: ianezz@xxxxxxxxxx
  • To: lugge@xxxxxxxxxxxxx
  • Date: Wed, 8 May 2002 16:34:49 +0200

Marco Ciullini, pigiando tasti a caso sul citofono, ha scritto:

 > Riavvio con il vecchio kernel... e tutto va a meraviglia. C'e` qualcuno che 
 > mi 
 > puo` aiutare a capire cosa c'e` che non va nel mio kernel? 

Puo` darsi che sia un problema con l'ECN?

Dalla configurazione del kernel (leggere in particolare il secondo
paragrafo):

   CONFIG_INET_ECN:                                                             
  
                            
      Explicit Congestion Notification (ECN) allows routers to notify           
   
      clients about network congestion, resulting in fewer dropped packets
      and increased network performance. This option adds ECN support to the
      Linux kernel, as well as a sysctl (/proc/sys/net/ipv4/tcp_ecn) which
      allows ECN support to be disabled at runtime.                             
                             
                                                                 
      Note that, on the Internet, there are many broken firewalls which        
      refuse connections from ECN-enabled machines, and it may be a while       
                    
      before these firewalls are fixed. Until then, to access a site behind
      such a firewall (some of which are major sites, at the time of this       
                                 
      writing) you will have to disable this option, either by saying N now
      or by using the sysctl.            
                                                   
      If in doubt, say N. 

Per cui e` disabilitabile a runtime tramite un semplice

      echo 0 > /proc/sys/net/ipv4/tcp_ecn

eseguito ovviamente da root. 

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