Network slow in one direction

Hi,
I have a strange problem. The network is slow in one direction, between a Solaris 10 box and a few Linux/Windows boxes.
Here is test result with iperf:
bash-3.00# ndd -set /dev/tcp tcp_cwnd_max 1048576
bash-3.00# /Desktop/iperf-2.0.3/src/iperf -c slave014 -d
Server listening on TCP port 5001
TCP window size: 48.0 KByte (default)
Client connecting to slave014, TCP port 5001
TCP window size: 48.0 KByte (default)
[ 5] local 192.168.128.175 port 40811 connected with 192.168.128.214 port 5001
[ 6] local 192.168.128.175 port 5001 connected with 192.168.128.214 port 37143
[ 6] 0.0-10.1 sec 900 MBytes 751 Mbits/sec
[ 5] 0.0-10.2 sec 4.66 MBytes 3.85 Mbits/sec
The speed between the linux/window hosts are OK. They are all connected to a unmanaged GB switch.
It does not look like duplex problem:
bash-3.00# dladm show-link
e1000g0 type: non-vlan mtu: 1500 device: e1000g0
e1000g1 type: non-vlan mtu: 1500 device: e1000g1
aggr1 type: non-vlan mtu: 1500 aggregation: key 1
bash-3.00# dladm show-dev
e1000g0 link: up speed: 1000 Mbps duplex: full
e1000g1 link: up speed: 1000 Mbps duplex: full
I've tried different tcp_xmit_hiwat tcp_recv_hiwat tcp_max_buf tcp_cwnd_max settings but it does not appear to help.
Any recommendations will be greatly appreciated.

I'm talking about either basic ethernet or a wifi connection. Basic ethernet has the same speed in either direction ie 'downstream' or 'upstream'. I don't know the specifics of wifi but I'm pretty sure it too has identical speeds in either direction.
I only have an ssh server on my linux machine so I'm always running the copy from the mac. To summarize:
$ scp file1 linux:/tmp -> 2.2Mb/s
$ scp linux:/tmp/file1 . -> 100Kb/s
I know that apple wifi cards sometimes have problems with linksys routers, but even with a normal ethernet connection the speeds are the same.
ibook G4 Mac OS X (10.3.9)

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I'm talking about either basic ethernet or a wifi connection. Basic ethernet has the same speed in either direction ie 'downstream' or 'upstream'. I don't know the specifics of wifi but I'm pretty sure it too has identical speeds in either direction.
I only have an ssh server on my linux machine so I'm always running the copy from the mac. To summarize:
$ scp file1 linux:/tmp -> 2.2Mb/s
$ scp linux:/tmp/file1 . -> 100Kb/s
I know that apple wifi cards sometimes have problems with linksys routers, but even with a normal ethernet connection the speeds are the same.
ibook G4 Mac OS X (10.3.9)

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Thanks, Patrick

Patrick... I had the same problem althjough not quite as complex I believe... see this thread... http://discussions.apple.com/thread.jspa?threadID=2111176&tstart=0
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