The mailserver is dual core Athlon with common ethernet (not shure the model at this time, the server is located to a customer)The firewall is a Zyxel Zywall 35.
but what are the problems if I leave tcp_window_scaling=0 ? thanks On Thu, Jan 29, 2009 at 5:06 PM, Edward St Pierre <[email protected] > wrote: > > 2009/1/29 Francesco Pasqualini <[email protected]> > > On Wed, Jan 28, 2009 at 5:37 PM, Brett Parker >> <[email protected]>wrote: >> >> > On 28 Jan 11:26, Francesco Pasqualini wrote: >> > > net/ipv4/tcp_window_scaling=0 >> > >> > If that fixes it it suggests that you're hitting a broken >> > firewall/router on the way that doesn't pass on TCP/IP window scaling >> > information and breaks it... >> >> >> I agree ! >> >> But I don't know what I have to fix at firewall level ? >> >> What are the tcp/udp port involved ? >> >> The exim4 is behind a firewall in a DMZ with private IP adress NAT (port >> fowarding). >> >> Unfotunately we have only 1 public IP (the firewall one) >> >> Maybe I have to forward some port (ICMP ?? but then I cannot ping the >> firewall) from the firewall to the mail server. >> >> What you think ? >> >> > I have had these problems before but it was related to the firewall > dropping packets where the window scaling was not 100% compliant. But I > later found that the load balancer was padding the Ethernet frame but it was > not the correct length. > > This was using a Fortigate with an NP2 accelerated NIC's and and Foundry > Load Balancer. > > Just out of interest what is being used in your environment? > > -- > ESP > -- ## List details at http://lists.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://wiki.exim.org/
