I know this is an old discussion - but your problem is, imho, self-inflicted.
Code:
michael@x071:[/home/michael]nfso -h nfs_use_reserved_ports
Purpose:
Specifies using nonreserved IP port number.
Values:
Default: 0
Range: 0 - 1
Type: Dynamic
Unit: On/Off
Tuning:
Value of 0 will use nonreserved IP port number when the NFS client communicates with the NFS server.
In the early 1980's there was this idea that port numbers less than 1024 could be "trusted" because only the super-user (aka root) could access them. This trust has been misplaced since the late 1980's as too many processes can access this so-called trusted ports. Why trust NFS (on port 2049)? It is well above 1024. Why it that number above 2049 trust-worthy and not other numbers.
In short, "trusted ports" exist in that it is still specified that a kernel privilege is needed to "open" aka request a connection from/to any other port.
If someone, even from your local security, says they MUST be 1023 and smaller - of course you can comply - BUT they are causing another security concept to become breached - availability. Not enough ports means no connectivity.
In short, port numbers - there is no added trust because a specific port number is being used. There might be a technical reason (e.g., firewall rules) to stay in a particular range - but the port number itself neither adds nor subtracts from the application security.
Hi Guys,
i am trying to open a port in AIX.
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So please any body can tell me how to open a port in AIX...
Thanks
sanju (2 Replies)
Hi,
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Hello Gurus,
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Discussion started by: Mcipamo
5 Replies
LEARN ABOUT SUSE
straps
straps(8) Tnm Tcl Extension straps(8)__________________________________________________________________________________________________________________________________________________NAME
straps - A simple SNMP trap multiplexer.
SYNOPSIS
straps [ port ]
_________________________________________________________________DESCRIPTION
The straps trap daemon listens on the snmp-trap port (usually port 162/udp) for incoming SNMP trap or inform messages and forwards them to
all connected clients (like scotty). The optional port argument allows to use the straps daemon to forward messages received on a non stan-
dard SNMP trap port. However, port numbers below 1024 will be rejected.
Clients connect to the straps daemon by opening the AF_UNIX domain stream socket /tmp/.straps-port. Thus, the default AF_UNIX domain stream
socket is named /tmp/.straps-162.
Received messages are forwarded using the following format:
4 byte IP address of the sender (network-byte-order).
2 byte Port number of the sender (network byte order).
4 byte Length of the trap message (host-byte-order).
n bytes The trap message itself.
The straps daemon must be installed setuid root because normal operating systems require root permissions to open the standard SNMP trap
port 162/udp. The straps daemon rejects all port numbers below 1024 in order to protect the system security.
SEE ALSO scotty(1), tkined(1), Tnm(n)
AUTHORS
Erik Schoenfelder <schoenfr@gaertner.de>
Juergen Schoenwaelder <schoenw@cs.utwente.nl>
Tnmstraps(8)
08-15-2018
