Source port on AIX for NAS is same? Post: 303018982

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Operating Systems AIX Source port on AIX for NAS is same? Post 303018982 by anil1000 on Wednesday 20th of June 2018 02:03:11 PM

06-20-2018

Registered User

Quote:

Originally Posted by Scrutinizer

It seems to me your problem is because of the firewall in between that is interfering with NFS communication. I think that the reason that you are having more problems with nfs_use_reserved_ports=1 is that there are fewer ports in the pool and you are therefore more likely to reuse a port that the Netapp SVM thinks is still in use. It thinks this can happen when the firewall interferes with normal communication and therefore the Netapp SVM has not learned that a port is no longer in use.

The firewall is probably configured to drop, rather than reject packets, so that is something that you could look into. Another thing to investigate is keep-alive signals and timeouts, to ensure that the firewall does not interfere..

That being said, it may be that your particular brand just does not work well with NFS, no matter what you try.

I am guessing that you are using a firewall to limit which systems are allowed to approach the filer, but I think it would be better if you put the firewall around the systems and the storage SVM so that there is a clear path between them, while also limiting which servers can approach the SVM.

Well, we talked with Firewall team as well, but they are saying that it is the normal behavior of the firewall to drop the packets rather than sending reset.

Another plan of action to resolve this issue is
Plan 1
keep both NAS IP and Storage LIF IP in same VLAN and don't keep any firewall in between. (currently both NAS IP and Storage LIF IP are in different VLAN with firewall in between)

but I would like to know
Plan 2
What if we keep the same setup with communication happening from random source ports from client end to storage LIF ports with firewall in between,

which will be more secure plan 1 or Plan 2?

Thanks

anil1000

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fwb_pix

fwb_pix(1)							 Firewall Builder							fwb_pix(1)

NAME

       fwb_ipt - Policy compiler for Cisco PIX

SYNOPSIS

       fwb_pix -fdata_file.xml [-V] [-dwdir] [-i] [-v] [-xc] [-xt] object_name

DESCRIPTION

       fwb_pix	is  firewall  policy  compiler	component  of Firewall Builder (see fwbuilder(1)). Compiler reads objects definitions and firewall
       description from the data file specified with "-f" option and generates resultant Cisco PIX configuration file. The configuration is  writ-
       ten to the file with the name the same as the name of the firewall object, plus extension ".fw".

       The data file and the name of the firewall objects must be specified on the command line. Other command line parameters are optional.

OPTIONS

       -f FILE
	      Specify the name of the data file to be processed.

       -d wdir
	      Specify  working	directory. Compiler creates file with PIX configuration in this directory.  If this parameter is missing, then PIX
	      configuration will be placed in the current working directory.

       -v     Be verbose: compiler prints diagnostic messages when it works.

       -V     Print version number and quit.

       -i     When this option is present, the last argument on the command line is supposed to be firewall object ID rather than its name

       -xc    When output file name is determined automatically (i.e. flags -o or -O are not present), the file name is composed  of  the  cluster
	      name  and  member firewall name rather than just member firewall name. This is used mostly for testing when the same member firewall
	      object can be a part of different clusters with different configurations.

       -xt    This flag makes compiler treat all fatal errors as warnings and continue	processing  rules.  Generated  configuration  script  most
	      likely will be incorrect but will include error message as a comment; this flag is used for testing and debugging.

URL

       Firewall Builder home page is located at the following URL: http://www.fwbuilder.org/

BUGS

       Please report bugs using bug tracking system on SourceForge:

       http://sourceforge.net/tracker/?group_id=5314&atid=105314

SEE ALSO

       fwbuilder(1), fwb_ipf(1), fwb_ipt(1) fwb_pf(1)

FWB
																	fwb_pix(1)