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06-06-2012 12:01 AM
06-06-2012 12:01 AM
NFS mount requests going though the Virtual Interface
Scenario:-
An NFS Server, server exports an NFS filesystem called /ignitebkp to an NFS client, client. Share rw access & mount access are given to client only.
The client has a primary interface (lan26) and multiple virtual interfaces (Yes, service guard packages).
Problem:-
mount permission denied on client. On examining the mountd.log on server, I see that the requests to mount are coming from the virtual interface and not from the IP address of client. How can I get the client to send the request for mount and all future access through its primary interface which actually resolves to client in DNS?
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06-06-2012 12:33 AM
06-06-2012 12:33 AM
Re: NFS mount requests going though the Virtual Interface
Are you saying there are multiple IP interfaces on the same subnet? If not, this is a matter of selecting the proper NFS server IP address that routes through the appropriate client interface. If your NFS client has numerous IP interfaces on the same subnet, that gets a little trickier to force the client to send using a specific interface.
If you want the client to send mount requests using the primary IP address of the interface you can try experimenting with the kctune parameter ip_strong_es_model. A setting of 2 might give you the behavior you're looking for.
Dave
[Any personal opinions expressed are mine, and not official statements on behalf of Hewlett Packard Enterprise]
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06-06-2012 02:37 AM
06-06-2012 02:37 AM
Re: NFS mount requests going though the Virtual Interface
Hi Dave.
Thanks for your reply.
Yes, I have multiple interfaces (one physical & many virtual) which are on the same subnet. These virtual interfaces are my service guard package IP addresses.
From your reply, it looks like a common behavior. I would like to know who & what determines which IP address should send the mount request. Meanwhile, I will do some study on ip_strong_es_model and will test it.
But, I am curious to know if this random selection is a known behavior.
Regards,
Naveej
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06-06-2012 09:29 AM
06-06-2012 09:29 AM
Re: NFS mount requests going though the Virtual Interface
Naveej.K.A wrote:But, I am curious to know if this random selection is a known behavior.
I very much doubt this is a "random" selection. More likely it is selecting the best interface to use based on the IP routing tables. You can verify this by examining the routing tables via "netstat -rn". You can also manipulate the routing tables to try to get the preferred interface used during NFS mounts, though I would first experiment with ip_strong_es_model.
Dave
[Any personal opinions expressed are mine, and not official statements on behalf of Hewlett Packard Enterprise]
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06-06-2012 08:58 PM
06-06-2012 08:58 PM
Re: NFS mount requests going though the Virtual Interface
Dave, Thanks for following up.
Well, I have a default gateway for the entire subnet. Both the physical & the virtual interface are on the same subnet, so I guess the routing information is not being used to pick up which interface the client must use.
To make it clear.
10.209.11.82 client client.domain.com ---> plumbed on lan26 10.209.11.89 client6 client6.domain.com ---> plumbed on lan26:4 10.209.11.16 server server.domain.com
client & server resolve to the hostname in DNS. whereas, client6 is my package name. The request for mount is going from client6instead of client.
I can give access permission in my dfstab for client6, but the whole thing will break when my package moves from client toanotherclient.
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06-07-2012 11:28 PM
06-07-2012 11:28 PM
Re: NFS mount requests going though the Virtual Interface
Not sure if this HP-UX routing gray paper (NOT an official HP document) could be of some help in routing in multi-homed environments.
http://www.mayoxide.com/presentations/Understanding_hpux_routing.pdf
Regards
-Rajesh