2.4.0 networking ?

[Sarantis Paskalis]

On Sun, 7 Jan 2001, Filippos Slavik wrote:

> [2] To poio periergo apo'la einai pws se merika sites den mporw na anoiksw 
> TCP connection. To remote site, apantaei "connection refused". Me kobh 
> diladi gia kapoion agnwsto logo giati den tithetai thema ACL oute oti 
> kaneis "den akouei" sto ip/port pou dokimazw. Xarakthristikh periptwsh se 
> http: Prospathw na anoiksw thn kentrikh selida tou in.gr kai tzifos (o 
> browser apantaei "connection refused"). Dokimazw "telnet www.in.gr 80" kai 
> pairnw connection-refused. Mpainw se allo linuxaki ekeinh thn stigmi 
> (2.2.16) kai safws to "telnet www.in.gr 80 petyxainei". Bootarw to mhxanami 
> mou se w2000 kai safws eimai se thesi na anoiskw TCP connection. Arxika 
> nomisa pws einai kapoio problhma me to in.gr (mias kai auto htan to prwto 
> site pou dokimasa na anoiksw meta to 2.4.0 compile), alla telika meta apo 
> merikes dokimes ftanw sto symperasma oti exw to idio problima me opoio site 
> den trexei Apache !? Oso kai an fenetai periergo (h egw fainomai 
> "elefantas") den mporw na dw www.in.gr, www.thea.gr (ola IIS) alla px 
> www.ntua.gr/www.mpa.gr blepw ? Epishs apo'tin stigmi pou esthsa ton 2.4.0 
> mou einai adynaton na milisw me HTTP proxy (me ton proxy.forthnet.gr 8080 - 
> squid)
> 
> Pragmatika den mporw na katalabw ti ginetai... pws einai dynaton na min 
> mporw na "milisw" me "epilegmena" mhxanhmata ? Peite mou pws den eimai 
> "elefantas" !

Ftaiei mallon to firewall pou xrhsimopoioun.  O 2.4 kernel exei
yposthriksh gia ECN (Explicit Congestion Notification).  Merika firewall
petane ta paketa pou den katalabainoune kai exoun auta ta bits set.  
Apenergopoihse to me

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

Sarantis

-- 
Sarantis Paskalis