[NCLUG] wierd problem

[Kevin Fenzi]

>>>>> "dmiles" == dmiles  <dmiles at holly.ColoState.EDU> writes:

dmiles> I have a *really* strange problem with my linux box that I was
dmiles> hoping somebody could help me with.

dmiles> I can't get www.sun.com to come into my computer. I know it's
dmiles> up because I can ssh into a friend's computer and use lynx to
dmiles> get it but my system won't do it. The other oddity is that
dmiles> it's only the sun website... I can even get java.sun.com but
dmiles> not sun.com...

dmiles> ... snipp...

dmiles> Does anybody have *any* clue what's going on?

dmiles> Is my system filtering those packets for some reason? Has sun
dmiles> blocked my IP or something?

Just a wild guess... do you have a custom compiled kernel? 

Did you enable TCP_ECN? 

you can check by doing: 

cat /proc/sys/net/ipv4/tcp_ecn

if it's 1 then it's enabled. Disable it with: 

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

and then try connecting to sun again... 

ECN is a cool way of lessening congestion on the backbone routers, but
some broken firewalls drop packets with the ECN bit set. :( 

If it's not ECN, can you ping www.sun.com? traceroute to it? 
Do you have a firewall possibly blocking it? 

kevin
-- 
Kevin Fenzi
MTS, tummy.com, ltd.
http://www.tummy.com/  KRUD - Kevin's Red Hat Uber Distribution