> Until then, sysctl is your friend. > > *BSD: sysctl -w net.inet.tcp.sack.enable=0 > L*n*x: sysctl -w net.ipv4.tcp_sack=0 (and I suppose something > equivalent if you use Linux IPv6 support). > > Wietse
Thanks for your suggestions, Ive had both SACK and Window Scaling turned off for the last hour but unfortunately i dont think its made a difference either. I think ive exhausted all possible options. I dont know how would I get a tcpdump upstream from the router. Its not a failing NIC either, because the same problem occurs on both our mailservers. Welcome to more suggestions, before I result to the final working solution: force the stupid admins to allow ICMP traffic with a shotgun :) Petr
