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Operating Systems AIX Source port on AIX for NAS is same? Post 303018983 by Scrutinizer on Wednesday 20th of June 2018 02:30:25 PM
Old 06-20-2018
Quote:
Originally Posted by anil1000
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.
That is a matter of choice. To drop packets is more so legitimate in an Internet facing situation, but if you are using it for internal segmentation dropping will break stuff, while a reject is more graceful. There are pros and cons, but it is not "normal behavior" in the sense that it is the only possibility.

Besides this, there are options to keep connections alive, to change timeouts or to make the time longer before the firewall interferes.

Quote:
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
With plan 2 I think you may still have the problem once in a while. just less frequently. I personally would typically avoid sharing NFS through a firewall, unless you are using NFS with Kerberos. If you are using standard NFS with auth_sys authentication then in my opinion that is usually not a very secure situation and using reserved ports is not going to help that. But even with all that you described I do not know enough about your situation...

Last edited by Scrutinizer; 06-20-2018 at 04:49 PM..
 

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ldns-notify(1)						      General Commands Manual						    ldns-notify(1)

NAME
ldns-notify - notify DNS servers that updates are available SYNOPSIS
ldns-notify [options] -z zone servers DESCRIPTION
ldns-notify sends a NOTIFY message to DNS servers. This tells them that an updated zone is available at the master servers. It can perform TSIG signatures and it can add a SOA serial number of the updated zone. If a server already has that serial number it will disregard the message. OPTIONS
-z zone The zone that is updated. -h Show usage and exit -v Show the version and exit -s serial Append a SOA record indicating the serial number of the updated zone. -p port Use port as destination port (default the DNS port 53) for the UDP packets. -y key:data Use the given TSIG key and base64-data to sign the NOTIFY. Uses the hmac-md5 algorithm. -d Print verbose debug information. The query that is sent and the query that is received. -r num Specify the maximum number of retries before notify gives up trying to send the UDP packet. EXIT CODE
The program exits with a 0 exit code if all servers replied an acknowledgement to the notify message, and a failure exit code otherwise. AUTHOR
Written by the ldns team as an example for ldns usage. REPORTING BUGS
Report bugs to <ldns-team@nlnetlabs.nl>. COPYRIGHT
Copyright (C) 2005 NLnet Labs. This is free software. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PUR- POSE. 9 Jan 2007 ldns-notify(1)
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