[CentOS] A question on networking (CentOS 6)

[KM]

seems to be a driver issue or something, according to some co-workers.  Thanks for the help, but I guess I need to upgrade the OS or use another card.
ThxKM

      From: KM <info4km at yahoo.com>
 To: KM <info4km at yahoo.com>; CentOS mailing list <centos at centos.org> 
 Sent: Monday, February 13, 2017 1:31 PM
 Subject: Re: [CentOS] A question on networking (CentOS 6)
   
Like I said, wishful thinking. The light is still out, so it could be the HW. 
I ran those commands (ip addr show, ip route show) on the 2 servers.  The output is identical except for the IP addresses and the MAC addresses, except on the server with the new card, it is missing the following IPV6 info for the interface name p2p1 which is the interface in question.
inet6 fe80::6a05:caff:fe06:9122/64 scope link
       valid_lft forever preferred_lft forever

Somehow I doubt we are using IPV6 but does it need to be there for some reason?  .... and if so , what do I do about it.
I apologize if these questions make no sense.  Other than the original setup, and sometimes editing the ifcfg files I usually don't have to do much else to get my network connections going.
KM

      From: KM <info4km at yahoo.com>
 To: CentOS mailing list <centos at centos.org> 
 Sent: Monday, February 13, 2017 12:49 PM
 Subject: Re: [CentOS] A question on networking (CentOS 6)
  

I will get back to the mailing list.   But to answer your questions, yes the IP addresses and interface names are as expected (as before) with the new MAC/HW addresses.  I have someone else looking into it because when we plugged in the cable the light on the card did not light up.   when we connect the pair server to another separate server it did.  Once the server is back up I will try these things that you suggest, and compare them to the pair server we are trying to connect to.  We are hoping that reseating the card will work.  Probably wishful thinking.
Thx.KM

      From: Gordon Messmer <gordon.messmer at gmail.com>
 To: CentOS mailing list <centos at centos.org> 
 Sent: Monday, February 13, 2017 12:08 PM
 Subject: Re: [CentOS] A question on networking (CentOS 6)
  
On 02/13/2017 06:55 AM, KM wrote:
> The NIC went bad and it has been replaced.  I knew enough to update the HW address in the ifcfg-* files.  The network service restarts successfully without errors.  However I cannot connect via ping or ssh with the pt2pt network setup on 192.168.x.*.  When I use our internal network ip addresses it is fine.

That's not much to go on.  The output of "ip addr show" and "ip route 
show" might help you figure out what's going on.  Do your interfaces 
have the expected names?  Do they have the expected IP addresses?

One thing that might be problematic is that there are multiple systems 
that attempt to maintain consistent interface names.  If your interface 
names are not what you expect, you might need to look at 
/etc/udev/rules.d/70-persistent-net.rules where there may be additional 
rules mapping specific MAC addresses to an interface name.

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