Serious problem with dual NICS and redhat 6.2

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12-27-2000, 03:57 PM
SKoL

Serious problem with dual NICS and redhat 6.2

Specific help is needed with a very serious and complex problem I have been having for about 2 months..

Scinero : Say I have one NT server. Dual NICS. NIC1 - 3com 3C905B - IP address 207.x.x.x NIC2 - Linksys - IP address 10.0.0.1 Say this NT server is a MS proxy 2.0 server. Been working fine the past year.

Problem : I turned this machine into a redhat 6.2 box. Same NICS, same cat5 cables, same patch panel, etc. The first NIC with the live ip (207) works great, pings internally and internet sites. On the other hand, the SECOND NIC doesnt' work at all. It doesn't show errors on boot up. Yet when i "ifconfig" it isn't up. I "ifup eth1" and it says "Network unreachable"

I have tried 20 different kinds of installs. I have tried different nics. I have tried different cat5, different ports on the switches/patch panels. I have tried everything. What is wrong? I know the Linksys cards work, because some of my other redhat servers (with one nic) have linksys cards. I do a "dmesg" and everything is on a different IRQ, so its not that. What I am doing wrong?? I have converted an ALL NT network (30+ servers) all to redhat 6.2 There are 3 Proxy servers I want to change then I'm done http://forums.justlinux.com/images/i.../2000/10/1.gif Please help! I'll be watching for responses incase anyone needs anymore information.

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12-27-2000, 04:04 PM
Calvin_1976

Is it dhcp or a static ip? And do you have files /etc/sysconfig/network-scripts/ifcfg-eth0 and /etc/sysconfig/network-scripts/ifcfg-eth1 ?
12-27-2000, 04:08 PM
SKoL

All static IP's..

And yes I have both files...they are all there and everything seems to be where it is supposed to.
12-27-2000, 04:09 PM
Calvin_1976

Try bringing the second ip up manualy with ifconfig
12-27-2000, 04:10 PM
SKoL

You mean like I said I had before? with ifup eth1?

Doesn't work.

"Network Unreachable" - it doesnt' make any F#*$#($ING sense, because the NT server had the same cables , nics etc and was working fine on both networks.
12-27-2000, 04:12 PM
Calvin_1976

Like this
ifconfig eth1 xxx.xxx.xxx.xxx up
then ifconfig and see if its there
12-27-2000, 04:18 PM
knute

Is linux seeing your second nic?

If it is pci a simple "cat /proc/pci |less" will show it. (assuming that you are using PCI nics of course http://forums.justlinux.com/images/i.../2000/10/1.gif)

Another thought -- Could they both be trying to use the same resources? If they are then only one will work at a time until one of them is changed...

(If it is the nic's in conflict a simple way to test would be to bring down nic0 and try nic1, but then again that should also show up in the /proc/pci as well... )

Hope it helps...
12-27-2000, 04:38 PM
SKoL

Yes, the card shows up and linux sees it. If there was a resource problem, wouldn't a dmesg tell me its on the same IRQ? *which it doesn't* And.......if it did have a resource problem, how would I go about fixing it.

UGH! See, I've done this 100 times, at home *static DSL connection , redhat 6.2 routes all my household traffic* so its not like i'm a newbie.... http://forums.justlinux.com/images/i.../2000/10/1.gif
12-27-2000, 04:51 PM
Sokertes

what happens if you take eth0 down then bring up eth1. does it come up. then try brining back up eth0. what happens?
12-27-2000, 05:09 PM
SKoL

I haven't tried that (at least I think i haven't) I'll try it tomorrow morn and see if it works..

If anyone else has anymore ideas, thanks....

And thanks to all who have reponded so quickly http://forums.justlinux.com/images/i.../2000/10/1.gif
12-27-2000, 07:54 PM
zGoRNz

dmesg | grep eth

see what that shows if it doesn't show both eth0 and eth1 then you might need to modprobe

try ifconfig -a
this shows down interfaces too

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12-28-2000, 01:21 AM
syn

ps. are all the linksys cards the same kind?
I mean I have linksys cards that work in 6.2 perfectly because they are version 2 cards, version 4 is out now and I bought one of those but havnt had the time to hunt down the drivers yet so it doesnt work yet, just an idea
06-18-2013, 11:08 AM
digg1980

reverse path filtering on RHEL 6

I believe this is due to the new reverse path filtering introduced in RHEL 6. It has changed how Redhat Linux do things a bit from Redhat 5. You can either Google "reverse path filtering" or just look at the following article to start: http://www.virtualizationteam.com/vi...c-to-ping.html

Hope that gets you into the right direction.

Regards,
Erick