Possible same issue on upgraded 8.04 and 6.10.

When I connect from the same IP subnet all goes OK, but when I pass
through a router or firewall the copy is stalled. The rest of network
traffic seems to be ok.

Tested on different machines all with different gigabit ethernet cards,
and with different connections:

* Case 1: Standard 64 bit PC w/ Ubuntu 8.04 Desktop and gigabit ethernet
connected to a 100 Mbit switch -> gateway (Linux box with IPtables
enabled to run as firewall) -> Cisco PIX -> Cisco router -> Destination
machine (Sun Fire x2200 w/ Ubuntu 8.04 Server).

* Case 2: same as case 1 but destination machine has Ubuntu 6.10.

* Case 3: same as case 1 and 2 but destination machine is a Compaq
laptop running non-ubuntu Linux.

* Case 4: Standard Pentium 4 PC w/ gigabit ethernet card connected to a
gigabit switch -> Linksys DSL router -> (public Internet) -> Unknown
router -> Standard AMD Opteron PC w/ 100 mbit network card running
Ubuntu 8.04 server.

I solved the issue adding the "-l" parameter to scp, ranges below the
maximum net troughput runs ok, values larger ends to a stalled
connection.

Examples:
---- bad transfer ----
[EMAIL PROTECTED]:~$ scp VMware-server-1.0.6-91891.tar.gz [EMAIL PROTECTED]:/tmp
[EMAIL PROTECTED]'s password: 
VMware-server-1.0.6-91891.tar.gz                2% 2204KB   1.3MB/s - stalled -

---- good transfer ----
[EMAIL PROTECTED]:~$ scp -l 10000 VMware-server-1.0.6-91891.tar.gz [EMAIL 
PROTECTED]:/tmp
[EMAIL PROTECTED]'s password: 
VMware-server-1.0.6-91891.tar.gz              100%  102MB   1.2MB/s   01:24

-- 
heavy network activity stalls network (on both ends)
https://bugs.launchpad.net/bugs/234484
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