mario ovvauoptisolutionscoza hi mark find isp block icmp type 3 pakets regards mario mark martinec wrote mario firewall box route chance block icmp type 3 packets shouldnt otherwise path mtu discovery work type 3 code 4 tcp session hang times hi mark phoned isp lowered mtu modem everything working fine ok although partial workaround work cases eg wont help side packet size bottleneck smaller true solution block icmp type 3 pakets essential ingredient network operation mark fri 08 aug 2008 063917 0200 timeouts