Hi I know this is OT, but I just need a pointer to some/more information. I have _very_ slow tcp-connections to our qmail smtp/pop3 server, I guess due to some network problems. The mail server is connected to a 100mbit-network (via a 10/100 hub). If I send mails/copy files(via ftp)/tranfer any kind of data, I get about 20-40 kByte/s... but only if the other host is connected via 100mbit too. If I use a host, that has only a 10mbit-link to the hub, the connection is at about 600kByte/s - which is _much_ better. I guess there is some problem with the cable, the nic, or the nub. Is a any good linux-software that allows me to debug this, e.g. to see if there are any tcp-retransmits, or if the ethernet-frames are corrupted??? Greetings, Florian Pflug