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TCP/IP ports
Observer Console
NAT
124
TCP/IP ports
Appendix A TCP/IP ports, NAT, and VPN
This section discusses the TCP/IP ports, NAT, and VPN.
Observer and all Network Instruments probes use ports 25901 and
25903 to communicate. These ports are registered ports to Network
Instruments.
All Network Instruments probes initiate connection with Observer
using port 25901. Observer listens on port 25901. After a connection
is established all communication between Observer and the probes
occurs on port 25901, except probe redirection and administration,
which uses port 25903.
Figure 85 Port connections
redirection request
n
n
Port
2
5
request approved
p
9
connection request
o
n
n
0
1
connection established
e
e
If you use network address translation (NAT) in your environment,
you must make some configuration changes in Observer. Using the
TCP/IP port information in "TCP/IP ports" on page 124, you should
be able to set up the NAT properly.
If the probe is outside the network where Observer is running, you
must forward port 25901 from the probe's address to the system
running Observer.
When redirecting the probe, you must specify the NAT outside IP
address instead of the address that Observer puts in automatically. By
default, Observer tries to use its local IP address, which the probe will
not be able to find. Select "Redirect to a specified IP address" in the
Redirecting Probe or Probe Instance dialog (Figure 86).
Port
25903
25901
Any Probe
25901
rev. 1
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