Eion LibraPlus 5845, Руководство пользователя, Страница: 117 / 140

Chapter 6. Monitoring and Statistics
6.1. Host Echo Test
An ICMP echo test can be performed using the utilities ping command.
utilities ping { host }
Description. The command starts to ping the given host. To stop the process press
Enter
.
No-Form. N/A.
Arguments.
host An IP address or a hostname.
Example 6.1. Ping a host
EION: utilities ping google.com
PING google.com (64.233.187.99) 56(84) bytes of data.
64 bytes from jc-in-f99.google.com (64.233.187.99): icmp_seq=1 ttl=242 time=1
64 bytes from jc-in-f99.google.com (64.233.187.99): icmp_seq=2 ttl=242 time=1
64 bytes from jc-in-f99.google.com (64.233.187.99): icmp_seq=3 ttl=242 time=1
6.2. Packet Capturing
LibraPlus allows to view contents of network packets passing through the system. Since the traffic
can be very intensive, you may use specific filters to reduce it. The
utilities tcpdump command is
used for packet capturing and parsing. It has the following synapsis:
utilities tcpdump [ interface ] [ protocol ] [ node | [src node ] [dst node ]] [syslog]
Description. The command shows the packets passing through. The system proceeds to capture
packets until
Enter
is pressed.
No-Form. N/A.
Arguments.
interface
Specifies a network interface to be used for packet capturing, including
interface name and index.
proto
One of the protocol types:
tcp
,
udp
,
icmp
or
ip
, where
ip
is a con-
junction of the
tcp
,
udp
and
icmp
.
node
Specifies either a destination, or source, or both IP addresses in captured
packet headers and a TCP/UDP port (or a port range):
{
ip-address | hostname
} [
port
|
from-port to-port
]
syslog is a keyword that enables sending all captured content to the
remote
syslog service
.
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