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Troubleshooting Techniques and Tools

1.2 Isolating Problems

Table 1–3 (Cont.)

tcpdump

Keywords

Keyword Deﬁnition

proto Restricts the match to a particular protocol. The following

protocols are allowed:

•

ether

•

ipv6

•

icmpv6

•

arp

•

tcp

•

udp

For example:

ether src foo

arp net 128.3

tcp port 21

If no proto keyword is speciﬁed, all protocols consistent with the

type are assumed. For example,

src foo

means:

(ip or arp or rarp) src foo

(Note that the latter is not valid syntax.)

net bar

means:

(ip or arp) net bar

port 53

means:

(tcp or udp) port 53

1.2.5.2.2 Keywords for Filtering Traces from non-OpenVMS Systems To ﬁlter

a trace taken on another platform, the following keywords are available:

•

ether

•

fddi

•

ipv6

•

icmpv6

•

arp

•

rarp

•

decnet

•

lat

•

moprc

•

mopdl

•

tcp

•

udp

Troubleshooting Techniques and Tools 1–11

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