ping
command? Give at least 3 answers. What does
ping
actually do?
traceroute
command tell the network
manager? Why is traceroute
not recommended for use
in regular network monitoring?
(Hard research question:How does traceroute work?)
/etc/mib.txt
.
ipForwarding OBJECT-TYPE ::= { ip 1 } icmpInEchos OBJECT-TYPE ::= { icmp 8 } tcpMaxConn OBJECT-TYPE ::= { tcp 4 }What are the numeric
OBJECT IDENTIFIERS
of the objects
ipForwarding
, icmpInEchoes
and
tcpMaxConn
.
OBJECT IDENTIFIERS
are encoded for transmission. In
general, the integers which
specify the OBJECT IDENTIFIER
are simply encoded in BER as
a SEQUENCE
of single byte values. However, the first two
integers (let's call them a and b) are encoded
in a compact form, taking only a single byte, of the form 40a +
b. So, for the Internet, the first two integers are 1.3,
therefore they are encoded as the single byte value 43. Can you imagine
a reason why this is done? What does it say about the values of these
first two integers?