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тАО09-29-2010 02:56 AM
тАО09-29-2010 02:56 AM
Network Issue
I am facing a disturbing problem.
We have an Alpha server running tru64 and datase application.
Users connect to databse application by telnet.
There are two type of users those that are in a samme bulding of the server and those that are on another buldings.
Now to increase the performence we have buy a new rx 6600 server running hpux 11iv3 based opreating system and installed the database application on the rx server.
We have also an application that monitoring our network.
The rx server and aplha server use the same gateway.
Every morning users connect to the Alpha server and woat this work, all is fine at this.
At afternoon we ask users to connect to rx server and problem begins.
Our network minotoring application show us that all network link failed, by putting the link in red like in the picture attached and user lose connection. But user in the same bulding of rx server still connected.
When use ask user to reconnect to aplha server the link become green that means all is fine.
Now I don't no where to investigate anymore.
I ready to give more information if you.
Please help me.
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тАО09-29-2010 03:58 PM
тАО09-29-2010 03:58 PM
Re: Network Issue
HP-UX has a feature called dead gateway detection - it will periodically ping the configured gateways (eg the the default gateway) if if it does not receive a reply after a certain number of tries, will assume the gateway is down and mark that route as unuable. If your gateways are configured to not respond to pings (eg ICMP Echo Requests) this could cause the HP-UX system to mistakenly believe the gateway is down.
This functionality can be controlled via an ndd setting (man ndd) called ip_ire_gateway_probe:
$ ndd -h ip_ire_gw_probe
ip_ire_gw_probe:
Enable dead gateway probes. This option should only be disabled on
networks containing gateways which do not respond to ICMP echo
requests (ping).
[0-1] Default: 1 (probe for dead gateways)
you can set that by hand and then edit the /etc/rc.config.d/netconf file - do be certain to read the comments in that file and make sure you do the right things with the indicies for the variables and such...
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тАО09-29-2010 06:11 PM
тАО09-29-2010 06:11 PM
Re: Network Issue
In addition to Ricks suggestion,
1. Are you using virtual IPs for the application?
2. "Our network minotoring application show us that all network link failed"
Are you able to ping (or check the connectivity manually). the server from other building, after you see the application shows connections are disabled?
3. Please confirm, if your samebuilding users are connected via router ( different subnet)
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тАО09-30-2010 10:52 AM
тАО09-30-2010 10:52 AM
Re: Network Issue
There are in the same subnet.
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тАО09-30-2010 12:28 PM
тАО09-30-2010 12:28 PM
Re: Network Issue
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тАО09-30-2010 01:01 PM
тАО09-30-2010 01:01 PM
Re: Network Issue
Ask your networking guys if the spanning tree root bridge is moving between the main switches for the buildings is moving around when the network load moves from building to building. It needs to be reviewed per vlan, per managed switch that can/does tree spanning, while keeping in mind that most any enterprise class switch falls into this category.
I've seen that one, where the root bridge of a VLAN can move around with a load moving at a time to a diff switch. You'll probably want to set priorities on those switch so that they can't decide for themselves who owns the root bridge. If you talk to the network guys and they don't know what you're talking about, you probably need a little outside help to explain to your team what it is and how it works, and how to set it up and maintain it properly. It's an important step that can be easy to overlook. It manifests itself as temporary outages, to full on persistent ones. All occurences I've seen are more wave like in function, of duration 5 to 15 minutes. Besides looking directly inside the switch for topology change events (there is a counter in there), a big tip off is a big landslide of unexplained broadcast traffic during the connectivity event. That's the root switch event itself, trying to figure out new paths to all the assets out there.
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тАО10-02-2010 08:56 AM
тАО10-02-2010 08:56 AM
Re: Network Issue
We are able to ping our gateway.
Do you think that despite this ndd -ip_ire_gw_probe can solve my problem?
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тАО10-04-2010 12:08 PM
тАО10-04-2010 12:08 PM