Network routing problem

[MaxBurn]

I have this problem with a customer, they can only receive SNMP traps when the sending server has its second NIC disabled. Have tried two different software packages in sending SNMP traps, they both behave the same way. I am not really skilled enough to spot anything wrong in a routing table though. Help?

Server IP addresses are:
10.20.8.170
10.23.248.88 - this address goes to a backup file server, SNMP only works when this is disabled for some reason.

The Openview SNMP receiver IP is 10.20.8.104/24 - this is the one that doesn't always work. Customer says that that IP always pings.

The Software sending SNMP traps is set to send to these IP addresses:
728, 18-Feb-2009 21:06:21.81, info, "TrapTarget 1: 10.31.8.104,public,162", "LxSswrmConfig",
729, 18-Feb-2009 21:06:21.81, info, "TrapTarget 2: 10.20.8.104,public,162", "LxSswrmConfig",

I don't know if the second destination works all the time or not. I have asked for a tracerout with that second NIC enabled verses disabled.

What else should I do?

Routing table from server;

C:\Documents and Settings\lgs>route print

IPv4 Route Table
===========================================================================
Interface List
0x1 ........................... MS TCP Loopback interface
0x10004 ...00 11 85 fe 9e f3 ...... HP NC7782 Gigabit Server Adapter #2
===========================================================================
===========================================================================
Active Routes:
Network Destination        Netmask          Gateway       Interface  Metric
          0.0.0.0          0.0.0.0        10.20.8.1      10.20.8.170     10
        10.20.8.0    255.255.255.0      10.20.8.170      10.20.8.170     10
      10.20.8.170  255.255.255.255        127.0.0.1        127.0.0.1     10
      10.50.8.106  255.255.255.255        10.20.8.1      10.20.8.170     10
   10.255.255.255  255.255.255.255      10.20.8.170      10.20.8.170     10
        127.0.0.0        255.0.0.0        127.0.0.1        127.0.0.1      1
        224.0.0.0        240.0.0.0      10.20.8.170      10.20.8.170     10
  255.255.255.255  255.255.255.255      10.20.8.170      10.20.8.170      1
Default Gateway:         10.20.8.1
===========================================================================
Persistent Routes:
  None

C:\Documents and Settings\lgs>route print

IPv4 Route Table
===========================================================================
Interface List
0x1 ........................... MS TCP Loopback interface
0x10004 ...00 11 85 fe 9e f3 ...... HP NC7782 Gigabit Server Adapter #2
0x40003 ...00 11 85 fe 9e f2 ...... HP NC7782 Gigabit Server Adapter
===========================================================================
===========================================================================
Active Routes:
Network Destination        Netmask          Gateway       Interface  Metric
          0.0.0.0          0.0.0.0        10.20.8.1      10.20.8.170     10
        10.20.8.0    255.255.255.0      10.20.8.170      10.20.8.170     10
      10.20.8.170  255.255.255.255        127.0.0.1        127.0.0.1     10
      10.23.248.0    255.255.254.0     10.23.248.88     10.23.248.88     10
     10.23.248.88  255.255.255.255        127.0.0.1        127.0.0.1     10
      10.50.8.106  255.255.255.255        10.20.8.1      10.20.8.170     10
   10.255.255.255  255.255.255.255      10.20.8.170      10.20.8.170     10
   10.255.255.255  255.255.255.255     10.23.248.88     10.23.248.88     10
        127.0.0.0        255.0.0.0        127.0.0.1        127.0.0.1      1
        224.0.0.0        240.0.0.0      10.20.8.170      10.20.8.170     10
        224.0.0.0        240.0.0.0     10.23.248.88     10.23.248.88     10
  255.255.255.255  255.255.255.255      10.20.8.170      10.20.8.170      1
  255.255.255.255  255.255.255.255     10.23.248.88     10.23.248.88      1
Default Gateway:         10.20.8.1
===========================================================================
Persistent Routes:
  None

 

[Mercutio]

Does the system sending the messages have any kind of log of its own?

 

[MaxBurn]

Yep, nothing out of ordinary. Whenever it sees the config file changed it reloads it and you can see that in the log along with the destinations that were configured. No failures listed.

Customer is asking how to bind it to a specific network adapter and there is no such thing, windows handles the routing. If it were listening for traps that would be a different thing, but it isn't.

 

[ddrueding]

Where do you have default gateways set? Traceroutes with the NIC enabled/disabled would be helpful.

 

[MaxBurn]

Doesn't the NIC's gateway show up in the routing table as 10.20.8.1? That's what I assumed that was. On the two pieces of software for sending traps that we have tried there is no gateway or mask configuration, just the destination IP.

Yeah, I am really interested in those traceroutes too.

 

[Mercutio]

Default Gateway should be specified on only one adapter. Windows will bitch if you try to set up two.

 

[Chewy509]

Other option is to set a static (or persistant) route...

Also toy with the routing costs as well to set the cost on LAN1 to be lower than LAN2.

 

[MaxBurn]

I will ping them again today, it rather annoys me when I am kept out of the loop on the solution if there is one.