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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 Monitor'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 products are shipped with an initial IP address that conforms to recent zero-configuration link-
local standards. This allows multiple E3Switch Monitors on the same IP network to initialize with unique
IP addresses without conflict and allows simple ping/HTTP/SNMP access to the Monitors using hostnames
e3switch.local or e3switch-2.local,... provided that, free,
the machine attempting to communicate with the Monitor. Do not prefix www. prior to e3switch.local.
www.e3switch.local will not work.
If multiple WAN Monitors are powered-up on a connected LAN, they will negotiate between themselves to
determine which 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 unit after power cycles, the system manager will
probably want to use/set the monitor'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
The Monitor can also be contacted at its initial default IP numeric address which always takes the form
169.254.aa.bbb. Units typically have the initial IP address listed on top of the chassis or can be initially
contacted at the IP address above where aa.bbb matches the serial number listed on the front label.
●
The Monitor'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 Monitor's IP address if lost or forgotten. Note that once
determined, management communication with the unit may only be possible from a host configured to the
same IP subnet address if the unit's default router address is invalid.
To manually discover a unit's IP address, unplug all LAN and BNC cables from the Monitor and power
cycle the unit. 30 seconds after powerup, the Monitor 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 Monitor 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 Monitors 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 modifiable within the first several minutes after powerup 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 any powerup. If
ZeroConf
ZeroConf
mDNS and
Link-local
or Avahi is available for Windows/Linux/Unix machines.
mDNS software has been installed on
IPV4LL ip addresses. Free ZeroConf
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