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IP Addressing
TUT Systems, Inc Page 71 of 104 P/N 220-06288-20
through DHCP that corresponds to a real address from one of the SMS2000’s DHCP
pools.
Note:
Addresses in the DHCP pool must be in the same subnet as the SMS2000
or in a control-net.
For example,
sms2000% group add dhcpers
sms2000% dhcp-pool mypool 192.168.0.100 192.168.0.110 255.255.255.0 lease 80
sms2000% iptype dhcp
sms2000% set rule bob 1 mac=00:01:02:03:04:05
Static Non-Routable Addresses
A fixed address can be assigned to a subscriber. Static non-routable addresses with
SMS2000 rules are configured in RADIUS or OCS. Subscribers who want to use their
assigned static non-routable addresses must set their client TCP/IP configurations with
the assigned addresses. If they use any other address or DHCP, they will still receive
service but their traffic will go through NAT.
Table 11-1 Static Non-routable Addresses
Address Policy NAT? Gets Consistent
IP Address?
Policy can be
sent via
RADIUS?
Policy can be
sent via OCS?
Plug-n-Play Yes No No Yes
Static No Yes No Yes
DHCP Pools No Yes No Yes
Fixed No Yes Yes Yes
1to1 Yes No No No
1to1 Unique Yes No No No
IP Multicasting
Ethernet multicast packets are translated by the SMS2000 before being sent to the
subscriber ports. The SMS2000 snoops IGMP between a multicast querier, such as a
multicast router or a content server, and hosts. The SMS2000 translates Ethernet
multicast MAC addresses to unicast MAC addresses; multicast packets received on the
network side of the SMS2000 are translated to unicast traffic on the subscriber side. Only
clients participating in IGMP receive multicast content.
A querier, such as a full feature multicast router or a content server, sends IGMP queries
on its local network. The SMS2000 forwards these queries (which are Ethernet
broadcasts) to each of the subscribers. If the subscribers are on VLAN switches, the
SMS2000 sends the query as a broadcast to each of the active VLANs. By snooping the
response from subscribers, the SMS2000 tracks whether each individual client is
requesting a multicast stream. If a subscriber fails to respond to three consecutive queries
for a particular multicast group or if the subscriber sends an IGMP“leave,” the SMS2000
stops sending the multicast content.