PDS-104G PoE Switch
Power Over Ethernet PowerView Pro User Guide
Copyright © 2016
Microsemi
Page 44 of 48
Rev. 1.0
CPG
– PoE BU
One Enterprise Aliso Viejo, CA 92656 USA
9
Recovering from Unknown Username, Password
The procedure below describes how to recover from a scenario in which the user is unable to access the unit by
Web or Telnet/SSH due to unknown unit username or password.
NOTE:
The recovery procedure can be performed
only
from the user local LAN (not over the Internet or from
another IP Network). User should be able to turn the unit power off when needed. All PoE ports
need
to
be disconnected, and the unit must have only a
single
active Ethernet link.
For security concerns - username, password recovery can be performed only from Unit local LAN using unit
IPv6 Link-Local address as FE80::9C39:DB8b:62DE:7CD4:
IPv6 Link-Local is limited to local LAN since it is blocked by all routers, meaning that password recovery
can be done only from the local LAN network, and not over the Internet or from remote IP Network.
No need to configure laptop or unit IPv6 Link-Local address since it is generated automatically (MAC
address-based).
9.1 Summarized Username, Password Recovery Procedure (for Experts)
1.
Only one
unit Ethernet link
may be up, leaving the other Ethernet ports disconnected.
2.
No PD device
is connected, meaning no power is provided by the unit to PD device.
3.
Turn unit power Off
. Wait 10 seconds or so to make sure the unit is completely off.
4. Apply back power to the unit. And
wait around
30
seconds.
5. The entire procedure described below should be done in
less than
120
seconds since power was
applied to the unit.
6. Connect to the unit Link-Local IPv6 address over
Telnet over TCP port 2525
(use the help of SysLog
Server in order to find out unit IPv6 Link-Local address). Use
passwordrecovery
both as username
and password. Trying to access the unit using any other known unit IPv4/IPv6 address will not lead to
recovering the unit from unknown username, password.
7. Upon successful login, the user will be given the option to restore the unit to
complete factory default
including all unit Network configuration
parameters, or cancel. Selecting the restore option will cause
the unit to
restore completely to factory default parameters including all unit Network configuration
parameters.
8. After unit reset, the user can regain control over unit configuration by browsing to IPv4 address
192.168.0.50, using the default username
admin
, and the default password
password
.
9.2 Detailed Step-by-Step Username, Password Recovery Procedure
1. Please disconnect from the unit all except for one Ethernet cable (only one Ethernet port should be
active).
2. Run IPv4 capable SysLog Server on your laptop/PC (make sure the firewall is turned off, or enable
UDP port
514
to pass through).
3. Turn the unit off, wait 10 seconds, and turn it back on. A SysLog message similar to the one in
Figure
9-1: Find Unit IPv6 Link-Local address from Power-Up SysLog Report below should appear after
15 seconds or so. Please identify unit IPv6 address (IPv6 Link-Local address always starts with FE80).