143
set ip igmp snoop-entry-time
seconds
The
snoop-entry-time
is the amount of time an entry will remain in the snooping table (in seconds) after being
added. An entry is added when a “JOIN” is seen from a multicast client. Any new joins (triggered by upstream
queries) will reset the timeout back to
seconds
. If no additional joins are seen, the entry will expire after
sec-
onds
. Default is
130
.
set ip igmp snooping-unreg-mode [ block | flood ]
The
snooping-unreg-mode
can be set to
block
or
flood
. This indicates what should happen to unregistered
multicast traffic – traffic that hasn't been subscribed to by any clients. If set to
flood
, the traffic will be sent to
all LAN ports. If set to
block
, the traffic will not be sent to any LAN ports; it will be dropped. Default is
block
.
NTP commands
set ip ntp enable [ on | off ]
Enables or disables acquiring the time of day from an NTP (Network Time Protocol) server.
set ip ntp server-address
server_address
set ip ntp alt-server-address
alt_server_address
Specify the NTP server(s) to use for time updates. The NTP
server-address
and
alt-server-address
can be
entered as DNS names as well as IP addresses.
set ip ntp update-period
minutes
update-period
specifies how often, in minutes, the Gateway should update the clock. Default is
1440
.
Application Layer Gateway (ALG) commands
These commands allow you to enable or disable the router’s support for a variety of Application Layer Gate-
ways (ALGs). An application layer gateway (ALG) is a NAT component that helps certain application sessions to
pass cleanly through NAT. Each ALG has a slightly different function based on the particular application’s proto-
col-specific requirements.
An internal client first establishes a connection with the ALG. The ALG determines if the connection should be
allowed or not and then establishes a connection with the destination computer. All communications go
through two connections – client to ALG and ALG to destination. The ALG monitors all traffic against its rules
before deciding whether or not to forward it. The ALG is the only address seen by the public Internet so the
internal network is concealed. In some situations, it may be desirable to disable some of the ALGs.
set ip alg esp-enable [ on | off ]
Turns the ESP (Encapsulated Security Payload) ALG for file transfers
on
or
off
. Default is
on
.
set ip alg esp-setup-timeout
value
Specifies the timeout value for the ESP ALG setup. Default is
180
.
set ip alg esp-stream-timeout
value
Specifies the timeout value for the ESP ALG streaming. Default is
300
.
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