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Chapter 4: Remote Management HTTP and SNMP
Other than the e3switch.local addresses described below, all IP addresses used within the converter's
management interface must be in xxx.xxx.xxx.xxx numeric format rather than a human-readable DNS-
resolvable hostname.
Automatic Link-Local IP Address
E3Switch converters are shipped with an initial IP address that conforms to recent zero-configuration link-
local standards. This allows multiple E3Switch converters on the same IP network to initialize with unique
IP addresses without conflict and allows simple ping/HTTP/SNMP access to the converters using
hostnames e3switch.local or e3switch-2.local,... provided that the free
installed on the machine attempting to communicate with the converter. Do not prefix www. prior to
e3switch.local. www.e3switch.local will not work.
The converters negotiate between themselves to determine which converter is assigned name e3switch.local
and which receives e3switch-2.local and so on. Since the assigned name will not necessarily be fixed to a
particular converter after power cycles, the system manager will probably want to use/set the converter's
numeric IP address sometime during or after initial installation.
Web descriptions are available for
software such as
Bonjour for Windows
Initial Numeric IP Address
When received from the factory, the converter can also be contacted at its initial default IP numeric address
which always takes the form 169.254.aa.bbb. Units can be initially contacted at this IP address where
aa.bbb matches the serial number listed on the front label.
The converter's current IP and MAC addresses are both shown at the HTTP management screen.
Unknown IP Address Recovery
The following methods may be used to determine a converter's IP address if lost or forgotten. Note that
once determined, management communication may only be possible from the same IP network if the
converter's default router address is invalid.
Unplug all LAN and BNC cables from the converter and power cycle the unit. 30 seconds after power-up,
the converter will begin blinking out its IP address on the leftmost LED. Each digit is counted up as an
orange blink with a pause between digits and a short blink for a 0. A decimal in the IP address is indicated
with a green blink. For example, <orange><orange><pause><short-orange><pause><green>... would be
an IP address that begins "20."
For those with access to packet sniffers, upon power-up, the converter will broadcast several gratuitous
ARP packets on its network ports which can be examined with a sniffer or packet monitoring software to
determine a unit's IP address. The source Ethernet MAC address of such packets and E3Switch converters
is 00:50:C2:6F:xx:xx. Tcpdump or Wireshark are two readily available software packages to examine
network packets.
Additionally, examination of the MAC address table of an attached LAN switch or router may provide the
IP address if the E3Switch MAC address prefix (00:50:C2:6F:xx:xx) can be located.
Management Passwords
The HTTP management statistics page is initially accessible without a password. The HTTP settings page
is initially accessible within the first several minutes after power-up with username admin and no password.
If the unit has not had its default password changed, after several minutes the settings page will be locked
for security reasons. It is desirable to change the default password of the unit. For security reasons,
changing the default password of the unit must be done within the first several minutes of power-up. If the
HTTP management password is lost or forgotten, it may be reset by accessing the HTTP management
settings within the first minute after power-up and with no BNC cables attached to the unit.
ZeroConf
mDNS and
Link-local
or Avahi is available for Windows/Linux/Unix machines.
ZeroConf
mDNS software has been
IPV4LL ip addresses. Free ZeroConf
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