How to choose between ip 2 identical ethernet cards

How to choose between ip 2 identical ethernet cards

[don fisher]

Sorry for a bit off topic.

I have a Dell 8200 laptop and a docking station, both with 3c905C 
ethenet chips. I wish to use the 3c905c internal to the docking 
station when the system is docked. Otherwise the 3c905c internal to 
the 8200. In my office I would like to run with both eth0 and eth1, 
but I need to be able to connect the correct interface to the correct 
cable. The same module is loaded for both devices.

The HOWTOs I found all assumed you had old cards with fixed addresses. 
These could be specified as options in modules.conf. From the Net-HOWTO:
         alias eth0 ne
         alias eth1 ne
         alias eth2 ne
         options ne io=0x220,0x240,0x300
But this does not seem to apply to the 3c59x driver. modinfo doesn't 
even list "io" as a valid option.

I did find:
  1) in /proc/ioports, one of the devices is listed with "(#2)" after it.
  2) in /etc/sysconfig/hwconf, one of the devices has
subDeviceId = 00d4, the other 00de.

I have tried changing the order of loading modules, along with a few 
vain attempts in modules.conf. For info, this is a Redhat system. 
Where is the definition as to which device will be associated with 
eth0 made?

Any assistance would be appreciated. I did try to RTFM, I just can't 
find the correct "fine manual";-)
thanks
don

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|    Don Fisher				  dfisher@as.arizona.edu  |
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Re: How to choose between ip 2 identical ethernet cards

[Valdis.Kletnieks]

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On Fri, 29 Aug 2003 17:29:29 PDT, don fisher <dfisher@as.arizona.edu>  said:

> I have tried changing the order of loading modules, along with a few 
> vain attempts in modules.conf. For info, this is a Redhat system. 
> Where is the definition as to which device will be associated with 
> eth0 made?

'man nameif'

Works great, less filling - my Dell 840 has up to *4* ethernets (the onboard
built-in, the dock, the built-in wireless, and a Xircom card that's a combo
56k modem/100BaseT).

My /etc/mactab looks like this:

# Onboard 10/100 port
eth0 00:06:5b:b9:5e:27
# 10/100 port on Xircom 10/100/56K card
eth2 00:10:a4:9c:a8:86
# wireless card
wvlan0 00:02:2d:5c:11:48
eth1 00:02:2d:5c:11:48
# 10/100 port on dock...
eth3 00:06:5b:ea:8e:4e

(yes, there's 2 entries for the wireless - 2.4 kernel wants wvlanX, 2.6 calls it ethX.

The magic under a RedHat system happens in:

/etc/sysconfig/network-scripts/ifup

Hope that helps.




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RE: How to choose between ip 2 identical ethernet cards

[David Schwartz]

> On Fri, 29 Aug 2003 17:29:29 PDT, don fisher
> <dfisher@as.arizona.edu>  said:

> The magic under a RedHat system happens in:
>
> /etc/sysconfig/network-scripts/ifup
>
> Hope that helps.

	Yep, quite painless. Just specify the mac address in the 'ifcfg-<name>'
configuration file.

	DS

Re: How to choose between ip 2 identical ethernet cards

[Randy.Dunlap]

On Fri, 29 Aug 2003 17:29:29 -0700 don fisher <dfisher@as.arizona.edu> wrote:

| Sorry for a bit off topic.
| 
| I have a Dell 8200 laptop and a docking station, both with 3c905C 
| ethenet chips. I wish to use the 3c905c internal to the docking 
| station when the system is docked. Otherwise the 3c905c internal to 
| the 8200. In my office I would like to run with both eth0 and eth1, 
| but I need to be able to connect the correct interface to the correct 
| cable. The same module is loaded for both devices.
| 
| The HOWTOs I found all assumed you had old cards with fixed addresses. 
| These could be specified as options in modules.conf. From the Net-HOWTO:
|          alias eth0 ne
|          alias eth1 ne
|          alias eth2 ne
|          options ne io=0x220,0x240,0x300
| But this does not seem to apply to the 3c59x driver. modinfo doesn't 
| even list "io" as a valid option.
| 
| I did find:
|   1) in /proc/ioports, one of the devices is listed with "(#2)" after it.
|   2) in /etc/sysconfig/hwconf, one of the devices has
| subDeviceId = 00d4, the other 00de.
| 
| I have tried changing the order of loading modules, along with a few 
| vain attempts in modules.conf. For info, this is a Redhat system. 
| Where is the definition as to which device will be associated with 
| eth0 made?
| 
| Any assistance would be appreciated. I did try to RTFM, I just can't 
| find the correct "fine manual";-)
| thanks
| don

I did a mini-howto for 'nameif'.  URL is below.  Maybe it can
help you.

http://www.xenotime.net/linux/doc/network-interface-names.txt

--
~Randy
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On Fri, 29 Aug 2003 17:29:29 -0700 don fisher <dfisher@as.arizona.edu> wrote:

| Sorry for a bit off topic.
| 
| I have a Dell 8200 laptop and a docking station, both with 3c905C 
| ethenet chips. I wish to use the 3c905c internal to the docking 
| station when the system is docked. Otherwise the 3c905c internal to 
| the 8200. In my office I would like to run with both eth0 and eth1, 
| but I need to be able to connect the correct interface to the correct 
| cable. The same module is loaded for both devices.
| 
| The HOWTOs I found all assumed you had old cards with fixed addresses. 
| These could be specified as options in modules.conf. From the Net-HOWTO:
|          alias eth0 ne
|          alias eth1 ne
|          alias eth2 ne
|          options ne io=0x220,0x240,0x300
| But this does not seem to apply to the 3c59x driver. modinfo doesn't 
| even list "io" as a valid option.
| 
| I did find:
|   1) in /proc/ioports, one of the devices is listed with "(#2)" after it.
|   2) in /etc/sysconfig/hwconf, one of the devices has
| subDeviceId = 00d4, the other 00de.
| 
| I have tried changing the order of loading modules, along with a few 
| vain attempts in modules.conf. For info, this is a Redhat system. 
| Where is the definition as to which device will be associated with 
| eth0 made?
| 
| Any assistance would be appreciated. I did try to RTFM, I just can't 
| find the correct "fine manual";-)
| thanks
| don

I did a mini-howto for 'nameif'.  URL is below.  Maybe it can
help you.

http://www.xenotime.net/linux/doc/network-interface-names.txt

--
~Randy