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Network Diagnostic Tools
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• using an HTTP client on another machine (typically a command-line client utility such as
curl
)
The output is streamed so that, when used with
curl
and
tcpdump
, you can monitor traffic in real time.
Limited filtering is provided by the FB6000, so you will normally apply any additional filtering you need via
tcpdump
.
13.3.1. Dump parameters
Table 13.1 lists the parameters you can specify to control what gets dumped. The "Parameter name" column
shows the exact parameter name to specify when constructing a URL to use with an HTTP client. The "Web-
form field" column shows the label of the equivalent field on the user interface form.
Table 13.1. Packet dump parameters
Parameter name
Web-form field
Function
interface
Interface
One
or
more
interfaces,
as
the name of the interface. e.g.
interface=WAN, also applies for
name of PPPoE on an interface
snaplen
Snaplen
The maximum capture length for a
packet can be specified, in bytes.
Default 0 (auto). See notes below.
timeout
Timeout
The maximum capture time can be
specified in seconds. Default 10.
ip
IP address (2-off)
Up to two IPs can be specified to
filter packets
self
Include my IP
By default any traffic to or from the
IP which is connecting to the web
interface to access pcap is excluded.
This option allows such traffic. Use
with care else you dump your own
dump traffic.
13.3.2. Security settings required
The following criteria must be met in order to use the packet dump facility :-
• You must be accessing from an IP listed as trusted in the HTTP service configuration (see Section 12.3).
• You must use a user and password for a "DEBUG level" user - the user level is set with the
level
attribute
on the
user
object.
Note
These security requirements are the most likely thing to cause your attempts to packet dump to fail. If
you are getting a simple "404" error response, and think you have specified the correct URL (if using
an HTTP client), please check security settings are as described here.
13.3.3. IP address matching
You may optionally specify upto two IP address to be checked for a match in packets on the interface(s) and/or
L2TP session(s) specified. If you do not specify any IP addresses, then all packets are returned. If you specify
one IP address then all packets containing that IP address (as source or destination) are returned. If you specify
two IP addresses then only those packets containing both addresses (each address being either as source or
destination) are returned.
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