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Cause of NIC changes ...?

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Operating Systems Solaris Cause of NIC changes ...?
# 1  
Old 11-06-2008
Cause of NIC changes ...?
Hi , I came across a SUN server whereby it was installed with additional ethernet card. By right in any configuration, you would probably see the onboard ports Net0,Net1 and so on should correspond to e1000g0,e1000g1...
But instead the ext PCI takes precedence in the order and the Net0 becomes e1000g4 , Net 1 e1000g5 and so on.. Had a hard time troubleshooting untill snoop was run and confirmed that the NIC card was not faulty but instead the "port ordering" has changed. What could be the cause? Any help is much appreciated Smilie
# 2  
Old 11-06-2008
this is no problem. the pci bus is scanned before the internel nics are scanned. so they will become net0 and so on. if you like to have the internal nics to be net0... you have to pull out the additional cards, install the system and then insert the cards again.
# 3  
Old 11-06-2008
Not sure why the system assigned them in that order, but to solve it read man path_to_inst Smilie

Quote:
/etc/path_to_inst records mappings of physical device names
to instance numbers.

The instance number of a device is encoded in its minor
number, and is the way that a device driver determines which
of the possible devices that it may drive is referred to by
a given special file.

In order to keep instance numbers persistent across reboots,
the system records them in /etc/path_to_inst.

This file is read only at boot time, and is updated by
add_drv(1M) and devfsadm(1M).

Note that it is generally not necessary for the system
administrator to change this file, as the system will main-
tain it.

The system administrator can change the assignment of
instance numbers by editing this file and doing a reconfi-
guration reboot. However, any changes made in this file will
be lost if add_drv(1M) or devfsadm(1M) is run before the
system is rebooted.
So, you can change /etc/path_to_inst, then do: touch /reconfigure; init 6.
# 4  
Old 11-06-2008
Quote:
Originally Posted by DukeNuke2
this is no problem. the pci bus is scanned before the internel nics are scanned. so they will become net0 and so on. if you like to have the internal nics to be net0... you have to pull out the additional cards, install the system and then insert the cards again.
Thank you vimes for the info. Smilie
DukeNuke, our practise is to integrate the h/w first then we install the OS. Other systems did not have such issue, only this. But seeing your explanation, it does make sense to follow such procedure.. But for this server, we lack time to do re-installation now..

Thx alot guys! Smilie
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