Help! Instable network on 6.06 based SuperMicro server with e1000 Intel driver

Hello everybody,

I'm having a strange problem with a new SuperMicro 5015MT+ server. I recently installed Ubuntu 6.06 on this server (not the LAMP version, but I manually added Mysql, Proftpd, Bind, Postfix, Apache, PHP, Courier-POP3/Courier-IMAP and ISPConfig). When working from the office network, the server responded very fast to network traffic such as HTTP or SSH. However, I yesterday installed the server in a data center, and since then, connecting to the machine is -very- unstable. Sometimes I'm able to connect to it, sometimes I'm not (it just doesn't respond then).

On this server there are two network interfaces. One of them is connected to the internal VLAN, and the other is pretty directly connected to the outside world. Whenever I'm unable to connect to the server using the outside IP, I login to another machine on the internal VLAN and try to connect to the internal IP. That works, most of the time.

Whenever I "/etc/init.d/networking restart", the connection becomes available quite stable for a few minutes, but then after a while it gets unstable again. Nothing seems to be wrong with the actual NIC though, because I'm able to download skype.exe (as a test file) with over 10 mbit/s.

Here is my interfaces file:

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto eth0
iface eth0 inet static
address 80.xx.xx.70
netmask 255.255.255.128
gateway 80.xx.xx.1
broadcast 80.xx.xx.255

auto eth1
iface eth1 inet static
address 10.0.0.70
netmask 255.255.255.0
gateway 10.0.0.1
broadcast 10.0.0.255

This is the current output of ifconfig -a:

eth0 Link encap:Ethernet HWaddr 00:30:48:96:B1:20
inet addr:80.xx.xx.70 Bcast:80.xx.xx.255 Mask: 255.255.255.128
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:20204 errors:0 dropped:0 overruns:0 frame:0
TX packets:4675 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
RX bytes:24130214 (23.0 MiB) TX bytes:533361 (520.8 KiB)
Base address:0x5000 Memory:e8a00000-e8a20000

eth1 Link encap:Ethernet HWaddr 00:30:48:96:B1:21
inet addr:10.0.0.70 Bcast:10.0.0.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:783 errors:0 dropped:0 overruns:0 frame:0
TX packets:927 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
RX bytes:70289 (68.6 KiB) TX bytes:308918 (301.6 KiB)
Base address:0x6000 Memory:e8b00000-e8b20000

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:81 errors:0 dropped:0 overruns:0 frame:0
TX packets:81 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:7335 (7.1 KiB) TX bytes:7335 (7.1 KiB)

Here is the output of "lshw -C network":

*-network
description: Ethernet interface
product: 82573E Gigabit Ethernet Controller (Copper)
vendor: Intel Corporation
physical id: 0
bus info: pci@0d:00.0
logical name: eth0
version: 03
serial: 00:30:48:96:b1:20
size: 100MB/s
capacity: 1GB/s
width: 32 bits
clock: 33MHz
capabilities: bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegociation
configuration: autonegociation=on broadcast=yes driver=e1000 driverversion=7.0.33-k2 duplex=full firmware=0.15-4 ip=80.69.93.70 link=yes multicast=yes port=twisted pair speed=100MB/s
resources: iomemory:e8a00000-e8a1ffff ioport:5000-501f irq:66
*-network
description: Ethernet interface
product: 82573L Gigabit Ethernet Controller
vendor: Intel Corporation
physical id: 0
bus info: pci@0e:00.0
logical name: eth1
version: 00
serial: 00:30:48:96:b1:21
size: 100MB/s
capacity: 1GB/s
width: 32 bits
clock: 33MHz
capabilities: bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegociation
configuration: autonegociation=on broadcast=yes driver=e1000 driverversion=7.0.33-k2 duplex=full firmware=0.5-7 ip=10.0.0.70 link=yes multicast=yes port=twisted pair speed=100MB/s
resources: iomemory:e8b00000-e8b1ffff ioport:6000-601f irq:74

And, the output of "ethtool eth0" and eth1:

Settings for eth0:
Supported ports: [ TP ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Supports auto-negotiation: Yes
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Advertised auto-negotiation: Yes
Speed: 100Mb/s
Duplex: Full
Port: Twisted Pair
PHYAD: 0
Transceiver: internal
Auto-negotiation: on
Supports Wake-on: umbg
Wake-on: g
Current message level: 0x00000007 (7)
Link detected: yes

Settings for eth1:
Supported ports: [ TP ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Supports auto-negotiation: Yes
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Advertised auto-negotiation: Yes
Speed: 100Mb/s
Duplex: Full
Port: Twisted Pair
PHYAD: 0
Transceiver: internal
Auto-negotiation: on
Supports Wake-on: umbg
Wake-on: g
Current message level: 0x00000007 (7)
Link detected: yes

I disabled IPv6, just to see if that makes any differences. Unfortunately, it doesn't seem to change the behavior. Also, I gave the server another IP just to see if that would make the problem disappear.. As you probably guessed, it didn't. In the hosting rack, I have a number of other SuperMicro servers running a home brewn LFS Linux that work just fine (for years already). Also, I have an identical SuperMicro machine (in another data center) with Ubuntu 6.06 running VMware that doesn't have any problems. Also, I updated the e1000 kernel module to the newest version provided by intel.

What could the problem be? Any thoughts on this?

Thanks!--
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