On Sat, 2010-09-18 at 21:08 -0400, Genes MailLists wrote:
Anyone got any suggestions for this.
I have a linksys sr2024 Gb switch
Several things are plugged into this - all using cat 5e or cat 6 cables.
Some things are connecting with full Gb speed but the main firewall wont.
The machine has 3 intel nic's -
lspci | egrep -i ethernet
04:00.0 Ethernet controller: Intel Corporation 82573L Gigabit Ethernet
Controller (rev 01)
05:04.0 Ethernet controller: Intel Corporation 82541PI Gigabit Ethernet
Controller (rev 05)
05:05.0 Ethernet controller: Intel Corporation 82541PI Gigabit Ethernet
Controller (rev 05)
The 82573 is on board and not used - the other 2 nic's are used - one
for internal subnet and one for external.
The internet side is connected to a cisco 800 router (which I believe
is 10/100 only .. tho I cudnt swear for sure)
The inside is connected to the SR2024 Gb switch.
Both nic's come up in 100 Mb/s - I rebooted the switch, and I plugged
and unplugged the cables, I tried ethtool -r ethx a few times to no avail.
Other machines on same switch are happily running at full gigabit speeds.
Nothing in logs suggests a problem
Is there a problem with multi nics of same brand where they need to run
at diff speeds ? Or is this a quirk with some hardware somewhere ? Or ???
We use Intel NIC's (both 1GbE and 10GbE) extensively (up to 16 linkes
per machine) for link monitoring without issues.
Appreciate any suggesions ... its getting tiring forcing
Try connecting the two links to each other.
Set their respective IP's to 220.127.116.11/255.255.255.0 (eth1) and
Now, check that they both auto negotiate to 1GbE/Full duplex.
If they don't, you have a wire issue. (Is it CAT 5 or above?)
If they do, do the following:
1. Install iptraf. ($ yum install iptraf -y)
2. Launch iptrag and configure it to work in promiscuous mode (Configure
-> Force promiscuous mode).
3. Go back, select the "general interface statistics".
4. From another console, start flood pinging.
ping -s 1400 -f -i eth2 -b 18.104.22.168
5. Return to the iptraf console, you should the see the packet increase
linearly on both interfaces. If it doesn't, something is broken, if it
does - you have a switch problem.