Lancom Systems LCOS 3.50 User Manual

Page 157

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Chapter 8: Firewall

LANCOM Reference Manual LCOS 3.50

157

Fi

rew

a

ll

The table contains the following elements:

Element

Element meaning

Src addr.

Source address of the connection

Dst addr.

Destination address of the connection

Protocol

Used protocol (TCP/UDP etc.). The protocol is decimally indicated.

Src port

Source port of the connection. The port is only indicated with port-related
protocols (TCP/UDP) or protocols, which own a comparable field (ICMP/
GRE).

Dst port

Destination port of the connection (with UDP connections, this one is occu-
pied only with the first answer).

Timeout

Each entry ages out with the time of this table, thus the table does not over-
flow with "died" connections.

Flags

In the flags the condition of the connection and further (internal) informa-
tion are stored in a bit field.(

page 158)

As conditions the following values are possible: new, establish, open,
closing, closed, rejected
(corresponding to the TCP flags: SYN, SYN ACK,
ACK, FIN, FIN ACK and RST).
UDP connections know the conditions new, open and closing (the last one
only, if the UDP connection is linked with a condition-afflicted control path.
This is e.g. the case with protocol H.323.).

Src route

Name of the remote station, over which the first packet has been received.

Dst route

Name of the remote station, where the first packet will be sent to.

Filter rule

Name of the rule, which has generated the entry (determines also the
actions to be executed), when a suitable packet is received.

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