PE 2950 III network issue with fedora 9 and centos 5.2

[Sebastien Deseille]

Hi

I have a very strange network issue with dell poweredge 2950 III server.
I tried with two OS installation (Fedora 9 and Centos 5.2) and one  
liveCD (opensolaris).

Symptoms are following :
When I try to surf the internet I use time out when the files are  
larger than 5792 bytes. I found this size limit by making several  
trial download FTP.

The most strange is that I can connect to an FTP site to browse the  
tree and download files as they are less than 5792 bytes.

This problem is blocking any update by the tool yum.

I check firewall rules and wire connection with windows laptop with success.

Here is the server configuration :

lspci
00:00.0 Host bridge: Intel Corporation 5000X Chipset Memory Controller  
Hub (rev 12)
00:02.0 PCI bridge: Intel Corporation 5000 Series Chipset PCI Express  
x4 Port 2 (rev 12)
00:03.0 PCI bridge: Intel Corporation 5000 Series Chipset PCI Express  
x4 Port 3 (rev 12)
00:04.0 PCI bridge: Intel Corporation 5000 Series Chipset PCI Express  
x8 Port 4-5 (rev 12)
00:05.0 PCI bridge: Intel Corporation 5000 Series Chipset PCI Express  
x4 Port 5 (rev 12)
00:06.0 PCI bridge: Intel Corporation 5000 Series Chipset PCI Express  
x8 Port 6-7 (rev 12)
00:07.0 PCI bridge: Intel Corporation 5000 Series Chipset PCI Express  
x4 Port 7 (rev 12)
00:10.0 Host bridge: Intel Corporation 5000 Series Chipset FSB  
Registers (rev 12)
00:10.1 Host bridge: Intel Corporation 5000 Series Chipset FSB  
Registers (rev 12)
00:10.2 Host bridge: Intel Corporation 5000 Series Chipset FSB  
Registers (rev 12)
00:11.0 Host bridge: Intel Corporation 5000 Series Chipset Reserved  
Registers (rev 12)
00:13.0 Host bridge: Intel Corporation 5000 Series Chipset Reserved  
Registers (rev 12)
00:15.0 Host bridge: Intel Corporation 5000 Series Chipset FBD  
Registers (rev 12)
00:16.0 Host bridge: Intel Corporation 5000 Series Chipset FBD  
Registers (rev 12)
00:1c.0 PCI bridge: Intel Corporation 631xESB/632xESB/3100 Chipset PCI  
Express Root Port 1 (rev 09)
00:1d.0 USB Controller: Intel Corporation 631xESB/632xESB/3100 Chipset  
UHCI USB Controller #1 (rev 09)
00:1d.1 USB Controller: Intel Corporation 631xESB/632xESB/3100 Chipset  
UHCI USB Controller #2 (rev 09)
00:1d.2 USB Controller: Intel Corporation 631xESB/632xESB/3100 Chipset  
UHCI USB Controller #3 (rev 09)
00:1d.3 USB Controller: Intel Corporation 631xESB/632xESB/3100 Chipset  
UHCI USB Controller #4 (rev 09)
00:1d.7 USB Controller: Intel Corporation 631xESB/632xESB/3100 Chipset  
EHCI USB2 Controller (rev 09)
00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev d9)
00:1f.0 ISA bridge: Intel Corporation 631xESB/632xESB/3100 Chipset LPC  
Interface Controller (rev 09)
00:1f.1 IDE interface: Intel Corporation 631xESB/632xESB IDE  
Controller (rev 09)
01:00.0 RAID bus controller: LSI Logic / Symbios Logic MegaRAID SAS  
1078 (rev 04)
02:00.0 PCI bridge: Broadcom EPB PCI-Express to PCI-X Bridge (rev c3)
03:00.0 Ethernet controller: Broadcom Corporation NetXtreme II BCM5708  
Gigabit Ethernet (rev 12)
04:00.0 PCI bridge: Intel Corporation 6311ESB/6321ESB PCI Express  
Upstream Port (rev 01)
04:00.3 PCI bridge: Intel Corporation 6311ESB/6321ESB PCI Express to  
PCI-X Bridge (rev 01)
05:00.0 PCI bridge: Intel Corporation 6311ESB/6321ESB PCI Express  
Downstream Port E1 (rev 01)
05:01.0 PCI bridge: Intel Corporation 6311ESB/6321ESB PCI Express  
Downstream Port E2 (rev 01)
06:00.0 PCI bridge: Broadcom EPB PCI-Express to PCI-X Bridge (rev c3)
07:00.0 Ethernet controller: Broadcom Corporation NetXtreme II BCM5708  
Gigabit Ethernet (rev 12)
0e:0d.0 VGA compatible controller: ATI Technologies Inc ES1000 (rev 02)

ethtool -i eth0
driver: bnx2
version: 1.7.4
firmware-version: 4.4.1 ipms 1.6.0
bus-info: 0000:07:00.0

ethtool -k eth0
Offload parameters for eth0:
rx-checksumming: off
tx-checksumming: off
scatter-gather: off
tcp segmentation offload: off
udp fragmentation offload: off
generic segmentation offload: off

Is anyone can help me ?
I don't know what to try.

regards