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Page 136 / 216 Scroll up to view Page 131 - 135
Administrator’s Handbook
136
set ip6 dhcp-server pd-enable [ on | off }
Enables or disables prefix delegation globally on all DHCPv6 servers on all IPv6 LAN conns, overriding individual
DHCPv6 server settings. The default is
on
.
set ip6 dhcp-server default-lease-time
seconds
Sets the global DHCPv6 lease time setting in seconds. The default is
2592000
(30 days).
set ip6 dhcp-server preferred-lifetime
seconds
Sets the global DHCPv6 preferred lifetime of prefixes in seconds, per RFC 3633. (http://www.ietf.org/rfc/
rfc3633.txt) The default is
604800
(7 days).
set ip6 dhcp-server T1
seconds
set ip6 dhcp-server T2
seconds
Sets global DHCPv6 T1, T2 values, per RFC 3315 for local NA addresses:
and also per global DHCPv6 T1, T2 values, per RFC 3633 for PD prefixes:
set ip6 dhcp-server info-refresh-time
seconds
In seconds, per rfc 4242: The information refresh time option specifies an upper bound for how long a client
should wait before refreshing information retrieved from DHCPv6 in stateless mode. (http://tools.ietf.org/html/
rfc4242) The default is
86400
(24 hours).
Static Routes
ip6 static-route.
set ip6 static-route
name
conn-oid
ipv6_conn_name
Route is directed to IPv6 connection named
ipv6_conn_name
.
set ip6 static-route
name
nexthop
IPv6_address
Next-hop IPv6 address for forwarding. Can be a global or link-local address.
T1
The time at which the client contacts the server from which the addresses in the IA_NA were
obtained to extend the lifetimes of the addresses assigned to the IA_NA; T1 is a time duration rel-
ative to the current time expressed in units of seconds. Defaults to
302400
(3.5 days).
T2
The time at which the client contacts any available server to extend the lifetimes of the addresses
assigned to the IA_NA; T2 is a time duration relative to the current time expressed in units of sec-
onds. Defaults to
483840
(5.6 days).
T1
The time at which the requesting router should contact the delegating router from which the pre-
fixes in the IA_PD were obtained to extend the lifetimes of the prefixes delegated to the IA_PD;
T1 is a time duration relative to the current time expressed in units of seconds.
T2
The time at which the requesting router should contact any available delegating router to extend
the lifetimes of the prefixes assigned to the IA_PD; T2 is a time duration relative to the current
time expressed in units of seconds.
Page 137 / 216
137
set ip6 static-route
name
prefix
IPv6_prefix
IPv6 prefix.
set ip6 static-route
name
prefix-length
value
[ 1 - 64 ]
IPv6 prefix-length.
set ip6 static-route
name
metric
value
[ 0 - 255 ]
metric assigned to route.
Page 138 / 216
Administrator’s Handbook
138
IP DNS commands
set ip dns domain-name
domain_name
Specifies the default domain name for your network. When an application needs to resolve a host name, it
appends the default domain name to the host name and asks the DNS server if it has an address for the “fully
qualified host name.”
set ip dns primary-address
ip_address
Specifies the IP address of the primary DNS name server.
set ip dns secondary-address
ip_address
Specifies the IP address of the secondary DNS name server. Enter
0.0.0.0
if your network does not have a sec-
ondary DNS name server.
set ip dns proxy-enable [ on | off ]
This allows you to disable the default behavior of acting as a DNS proxy. The default is
on
.
Page 139 / 216
139
IP IGMP commands
Multicasting
is a method for transmitting large amounts of information to many, but not all, computers over an
internet. One common use is to distribute real time voice, video, and data services to the set of computers which
have joined a distributed conference. Other uses include updating the address books of mobile computer users in
the field, or sending out company newsletters to a distribution list.
Since a router should not be used as a passive forwarding device, Motorola Gateways use a protocol for forward-
ing multicasting: Internet Group Management Protocol (IGMP).
Motorola Gateways support IGMP Version 1, Version 2, or Version 3.
IGMP “Snooping”
is a feature of Ethernet layer 2 switches that “listens in” on the IGMP conversation between
computers and multicast routers. Through this process, it builds a database of where the multicast routers reside
by noting IGMP general queries used in the querier selection process and by listening to other router protocols.
From the host point of view, the snooping function listens at a port level for an IGMP report. The switch then pro-
cesses the IGMP report and starts forwarding the relevant multicast stream onto the host's port. When the switch
receives an IGMP leave message, it processes the leave message, and if appropriate stops the multicast stream
to that particular port. Basically, customer IGMP messages although processed by the switch are also sent to the
multicast routers.
In order for IGMP snooping to function with IGMP Version 3, it must always track the full source filter state of each
host on each group, as was previously done with Version 2 only when Fast Leave support was enabled.
IGMP Version 3
supports:
IGMP Source Filtering: the ability for group memberships to incorporate source address filtering. This allows
“Source-Specific Multicast” (SSM). By adding source filtering, a Gateway that proxies IGMP can more selectively
join the specific multicast group for which there are interested LAN multicast receivers.
These features require no user configuration on the Gateway.
You can set the following options:
◆
IGMP Snooping
– enables the Motorola Gateway to “listen in” to IGMP traffic. The Gateway discovers multi-
cast group membership for the purpose of restricting multicast transmissions to only those ports which have
requested them. This helps to reduce overall network traffic from streaming media and other bandwidth-inten-
sive IP multicast applications.
◆
Robustness
– a way of indicating how sensitive to lost packets the network is. IGMP can recover from robust-
ness minus 1 lost IGMP packet. The default value is 2.
◆
Query Interval
– the amount of time in seconds between IGMP General Query messages sent by the querier
gateway. The default query interval is 125 seconds.
◆
Query Response Interval
– the maximum amount of time in tenths of a second that the IGMP Gateway waits
to receive a response to a General Query message. The default query response interval is 10 seconds and
must be less than the query interval.
◆
Unsolicited Report Interval
– the amount of time in seconds between repetitions of a particular computer’s
initial report of membership in a group. The default unsolicited report interval is 10 seconds.
◆
Querier Version
– select a version of the IGMP Querier: version
1
, version
2
, or version 3. If you know you will
be communicating with other hosts that are limited to v1 or v2, for backward compatibility, select accordingly;
otherwise, allow the default v3.
☛
NOTE:
IGMP Querier version is relevant only if the Gateway is configured for IGMP forwarding. If any IGMP
v1 routers are present on the subnet, the querier
must
use IGMP v1. The use of IGMP v1 must be
administratively configured, since there is no reliable way of dynamically determining whether IGMP
v1 routers are present on a network. IGMP forwarding is enabled per IP Profile and WAN Connec-
Page 140 / 216
Administrator’s Handbook
140
tion Profile.
◆
Last Member Query Interval
– the amount of time in tenths of a second that the IGMP gateway waits to
receive a response to a Group-Specific Query message. The last member query interval is also the amount of
time in seconds between successive Group-Specific Query messages. The default last member query interval
is 1 second (10 deci-seconds).
◆
Last Member Query Count
– the number of Group-Specific Query messages sent before the gateway
assumes that there are no members of the host group being queried on this interface. The default last member
query count is 2.
◆
Fast Leave
– set to
off
by default, fast leave enables a non-standard expedited leave mechanism. The querier
keeps track of which client is requesting which channel by IP address. When a leave message is received, the
querier can check its internal table to see if there are any more clients on this group. If there are none, it imme-
diately sends an IGMP leave message to the upstream querier.
◆
Log Enable
– If set to on, all IGMP messages on both the LAN and the WAN will be logged.
◆
Wireless Multicast to Unicast conversion
– Only available if
IGMP Snooping
is enabled. If set to
on
, the
Gateway replaces the multicast MAC-address with the physical MAC-address of the wireless client. If there is
more than one wireless client interested in the same multicast group, the Gateway will revert to multicasting
the stream immediately. When one or more wireless clients leave a group, and the Gateway determines that
only a single wireless client is interested in the stream, it will once again unicast the stream.
set ip igmp querier-version [ 1 | 2 | 3 ]
Sets the IGMP querier version: version
1
, version
2
, or version
3
. If you know you will be communicating with
other hosts that are limited to v1, for backward compatibility, select
1
; otherwise, allow the default
3
.
set ip igmp robustness
value
Sets IGMP robustness range: from 2 – 255. The default is 2.
set ip igmp query-interval
value
Sets the query-interval range: from 10 seconds – 600 seconds, The default is 125 seconds.
set ip igmp query-response-interval
value
Sets the query-response interval range: from 5 deci-seconds (tenths of a second) – 255 deci-seconds. The default
is 100 deci-seconds.
set ip igmp unsolicited-report-interval
value
Sets the unsolicited report interval: the amount of time in seconds between repetitions of a particular computer’s
initial report of membership in a group. The default is 10 seconds.
set ip igmp fast-leave [ off | on ]
Sets fast leave
on
or
off
. Set to
on
by default, fast leave enables a non-standard expedited leave mechanism.
The querier keeps track of which client is requesting which channel by IP address. When a leave message is
received, the querier can check its internal table to see if there are any more clients on this group. If there are
none, it immediately sends an IGMP leave message to the upstream querier.
set ip igmp max-group-memberships
value
Sets the maximum number of IGMP group memberships. Default is
20
.
set ip igmp fwd-admin-groups [ off | on ]
Turns Admin group forwarding off or on. Default is
off
.

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