Network - can't ping beween 2 servers on same network

Hello,

I have a problem pinging between 2 hosts.
both have a "production" network card and a "Backup" card.

cards in productions works fine, but backup cards does not work.

exchange server 003 has : 172.16.0.124
exchange server 004 has: 172.16.0.123

can't ping between those to hosts. I can ping between other hosts on the same network like exch001 and 002.

Local firewall is disabled on both. and tried almost everything.

Both are physical (HP G8 servers) with 4 network cards (2 active).
One card works perfect , other card works not so good.

It's connected to a large Cisco MPLS network with some hops beteween the edge switch to PE (Provider Edge) node.
But I have checked that the VLAN tagged are existing on each hop/nodes.

Can it be like network drivers/cabeling that fails.
checked that autodetect on ports are fullduplex, 1000mbp/s.

Best Regards Aamodt
LVL 7
aamodtAsked:
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Istvan KalmarHead of IT Security Division Commented:
HI, is the ip address collusion?

what showa on pc the arp table?
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aamodtAuthor Commented:
ARP tabel show mac addresses from the host that it cant ping. thats whats wierd.
There is no collisions on the network card.

On server its only "destination unreachable" messages because of the one server.
Its no "ip conflict" aswell. servers are standing on a reservation only dhcp network.


From switch:
 EXCH004
     78846907815 packets input, 113148813836006 bytes, 0 no buffer
     Received 1231269 broadcasts (0 multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 104570 multicast, 0 pause input
     0 input packets with dribble condition detected
     40153688541 packets output, 3023626007593 bytes, 0 underruns
     0 output errors, 0 collisions, 1 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier, 0 PAUSE output
     0 output buffer failures, 0 output buffers swapped out






EXCH003
     927285248 packets input, 1391586034219 bytes, 0 no buffer
     Received 153931 broadcasts (18445 multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 18445 multicast, 0 pause input
     0 input packets with dribble condition detected
     176125983 packets output, 13031499332 bytes, 0 underruns
     0 output errors, 0 collisions, 3 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier, 0 PAUSE output
     0 output buffer failures, 0 output buffers swapped out
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BigPapaGottiCommented:
Can you run a "route print" from the command line of both of these servers. Also can you do a "tracert" from both servers to see where the traffic is failing. Are you certain there is no ACL that is blocking icmp? Do these do servers have PVLAN's configured on their switch ports?
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aamodtAuthor Commented:
Interface: 172.16.0.124 --- 0xe
  Internet Address      Physical Address      Type
  172.16.0.123        d8-9d-67-1a-e8-25     dynamic

This is on both servers. can also ping gateway and other hosts like : 172.16.0.153 answers well on both servers..

Very weird problem, first time i've encountered it
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aamodtAuthor Commented:
C:\Users\>tracert 172.16.0.135

Tracing route to [172.16.0.135]
over a maximum of 30 hops:

  1    <1 ms    <1 ms    <1 ms   [172.16.0.135]

<- host that works.
if i try to trace from 172.16.0.124 to  172.16.0.123 it goes in request time out for 30 hops.

Its no ACL's since its a servernet that just have connectivity with eachother and no "internet access" its not even a firewall between the hosts.


its a firewall between the hosts on the other network card, but the is routet right way.
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aamodtAuthor Commented:
Its not a private vlan on ports , its a "public" one.
We dont have the same problem on other pysical/XEN/VM hosts that are connected to same switch/nexus.
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aamodtAuthor Commented:
and they have the same VLAN configurated , only different is that G8 have other network card/infrastuture.

Might be a problem there.

But I work with network , so need to clearify that the network is okey first. before others can look at it.
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GrobpaCommented:
This may sound silly.

Is network file sharing enabled?
did you enable RDP under system properties?

i have seen this is normally an issue.
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aamodtAuthor Commented:
RDP is enabled and file shareing like (drives shares C$ ect).

We have ILO (intergrated ligths outage) on the servers so i can try turning it off and see whats happends.
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AkinsdNetwork AdministratorCommented:
open run window (Windows logo + R)
type firewall.cpl
select Allow a program or feature through windows firewall
look for file and printer sharing
Enable it by checking the box.
Click ok


If the servers are on the same network and the vlan on the switch is set correctly, then this is most likely the problem.

Inability to ping does not always indicate lack of communication, icmp may just be blocked either on the switch or on the server in this case.
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andyalderCommented:
>both have a "production" network card and a "Backup" card.

Would that be backup as in backing up the data or backup as in one port is meant to take over if the other fails?

Either way you've said you have two ports active but only given us one IP address per server and you haven't said that they are teamed. We need more info.
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aamodtAuthor Commented:
backupcard is not a failover, and they are not teamed. backupcard is just functioning as a network to upload data to a backupserver/tape.
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andyalderCommented:
Normal way to have a separate backup/restore LAN is to have it on a different subnet and unbind the normal MS protocols such as file sharing from it and to use interface specific DNS or to not bother to register it in DNS at all. If you have both ports on the same subnet range it's likely that packets will go out of the wrong interface.
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aamodtAuthor Commented:
found out the problem. not me/network problems this time either. was a driver error in HP G8.

Thanks for the help
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aamodtAuthor Commented:
I've requested that this question be closed as follows:

Accepted answer: 0 points for aamodt's comment #a39587384

for the following reason:

Server architect found solution in HP supportpack solution
0
aamodtAuthor Commented:
deploying points for the help.
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