EBW-E100
Functions
87
12.6.9
Debugging
Various tools of the EBW-E100 enable to analyse problems with network
connections.
The "PING" tool allows to send ICMP pings (ping packets). This enables to test,
whether a specific machine is available in the network, easily. The "TRACEROUTE"
tool shows the route of an IP packet to its destination. The "DNS LOOKUP" tool
allows to request DNS information via an IP address or a domain name. The
"TCPDUMP" tool allows to record network packets.
Configuration via web interface (menu "System", page "Debugging")
In order to send a ping packet, select the tool "PING" for IPv4 pings or
"PING6" for IPv6 pings in the drop-down list field, enter the IP address,
to which you want to send the ping packet, or the domain name into the
field "Parameter" and click on "OK". Optionally, you may enter additional
parameters before, like -s 300 (sends 300 bytes as payload in ICMP ping)
or -c 3 (sends subsequent 3 pings) for example. The reply will be
displayed on the bottom of the page.
In order to trace the route of an IP packet, select the tool "TRACEROUTE"
for IPv4 packets or "TRACEROUTE6" for IPv6 packets in the drop-down
list field, enter the IP address, to which you want to send the IP packet,
or the domain name into the field "Parameter" and click on "OK".
Optionally, you may increase the standard number of 3 hops by
increasing the number of hops to 5 for example using the parameter "-m
5" before. The reply will be displayed on the bottom of the page.
In order to query DNS information, select the tool "DNS LOOKUP" in the
drop-down list field, enter the IP address or domain name to be queried
into the field "Parameter" and click on "OK". If no DNS server has been
configured or assigned by an external provider or router, this query may
take up to 40 seconds.
In order to start recording of network packets, select the tool
"TCPDUMP" in the drop-down list field, specify at least the network
device using the parameter "-i" in the field "Parameter" (e.g. "-i br0" for
the LAN interface) and click on "OK". The available network devices can
be identified by selecting the link "Show current system state" in the
menu "System" on the page "System data". After starting, the recording
will continue until it is stopped manually, the logged network interface is
closed (e.g. the cellular radio interface), or has reached a size of 1 MB.
The recording will be displayed in text format immediately after stopping
and can be downloaded as a file using the link "TCPDUMP
recording"that will then be displayed. It can be viewed on an external
machine using "tcpdump" or "wireshark". The recording will not be
stored in case of a restart of the device.
