Low Bandwidth on intercontinental connections

[Ingo Flaschberger]

> nearly every packet is fragmented, if i read th [TCP segment of a
> reassembled PDU] correct. Those have a length of 1364. Thera are also
> lots of [TCP Window Update] (every two to three acks from the receiving
> host, where the tcpdump took place). After some time, there were lots of
> [TCP Dup ACK] from the receiving host and the throughput went to a crawl
> and had lots of retransmissions. After 30 sec. everything went back to
> "normal" as of transmitting pakets without dubs and retransmissions.

how you can detect fragmented packets:
tcpdump at sender and at receiver site.
If you send 1500 byte packets but receive 2 differnt sized packets (a 
bigger and a smaller one) at the other site - than there is fragmentation.

1364 packet length seems strage, as your
max icmp packet is 1322 byte + 20byte IP header + 8byte icmp = mtu 1350?


> The same tcpdump collect on the Linux hosts, the packets had a length of
> 1514 and no dubs or retransmissions.

1514? max mtu on ethernet is 1500

can you send me (directly) a send and receive site tcpdump from linux 
and freebsd for a whole data-transfer?

Kind regards,
     Ingo Flaschberger