Technical data

Troubleshooting Techniques and Tools

1.2 Isolating Problems

Table 1–3

tcpdump

Keywords

Keyword Deﬁnition

type Deﬁnes the object to which the ID name or number refers. The

following types are allowed:

•

host

•

net

•

port

For example:

host foo

net 128.3

port 20

If no type keyword is speciﬁed,

host

is the default.

dir Speciﬁes a particular transfer direction to or from id. The

following directions are allowed:

•

src

•

dst

•

src or dst

•

src and dst

For example:

src foo

dst net 128.3

src or dst port 20

src and dst port 123

If no dir keyword is speciﬁed,

src or dst

is the default.

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1–10 Troubleshooting Techniques and Tools