FC3 traffic can't get thru firewall

Pedro Fernandes Macedo webmaster at margo.bijoux.nom.br
Sun Feb 13 17:05:43 UTC 2005

Bill Gradwohl wrote:

> I even moved the IP address of bigboy around to several other private 
> addresses, and cleared the ARP caches involved to see if it was 
> firewall rule related, and no matter what IP I put bigboy on its 
> always the same thing. Traffic hits the public side of the firewall 
> and disappears.
> I've got ipv6 and Window scaling turned off on the FC3 box.
> Any ideas?
Gonna take a long shot here... Check on /proc/sys/net/ipv4 if tcp_ecn is 
enabled. Some routers silently drop packets if the ECN bit is set... 
maybe your router is one of those...
Also , do a tcpdump when trying to connect from bigboy to an external 
webserver. This way you will know if the data is going through the 
firewall.. if it is , the next step is trying to check the router , as 
it is the most probable cause...

Pedro Macedo

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