Motorola Netopia Embedded Software, Руководство пользователя

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4-4 Administrator’s Handbook
Exterior addresses are allocated to internal hosts on a demand, or as-needed, basis and then made available
when traffic from that host ceases. Once an internal host has been allocated an address, it will use that
address for all traffic. Five minutes after all traffic ceases – no pings, all TCP connections closed, no DNS
requests, etc. – the address is put at the head of an
available list. If an interior host needs an exterior address
an hour later, and the previously used address is still available, it will acquire the same address. If an interior
host that has not previously been allocated an exterior address needs one, it will be allocated the last, hence
the oldest, exterior address on the available list.
All NAT configurations are rule-based . This means that traffic passed through NAT from either the public or the
private network is compared to the rules and mappings configured in the Motorola Netopia
®
Router in a
par ticular order. The first rule that applies to the traffic being initiated is used.
For example, if a connection is initiated from the public network and is destined for a public IP address
configured on the Motorola Netopia
®
Router, the following comparisons are made in this order.
1. The Motorola Netopia
®
Router first checks its internal NAT cache to see if the data is par t of a previously
initiated connection, if not…
2. The Motorola Netopia
®
Router checks the configured ser ver lists to see if this traffic is intended to be
for warded to an internal host based on the type of ser vice.
3. The Motorola Netopia
®
Router then checks to see if there is a static, dynamic, or PAT mapping for the
public IP address that the connection is being initiated to.
4. The Motorola Netopia
®
Router answers the request itself if the data is destined for the Motorola
Netopia
®
’s WAN inter face IP address. Other wise the data is discarded.
Complex maps
Map lists and ser ver lists are completely independent of each other. A Connection Profile can use one or the
other or both.
MultiNAT allows complex mapping and requires more complex configuration than in earlier software versions.
Multiple mapped interior subnets are suppor ted, and the rules for mapping each of the subnets may be
different. The figure below illustrates a possible multiNAT configuration.
172.16.1.25 172.16.1.26 172.16.1.27 172.16.1.28 172.16.1.29
Network Address Translation
Available for Dynamic NAT Used for Normal NAT
192.168.1.16 192.168.1.15 192.168.1.14 192.168.1.13 192.168.1.12 192.168.1.11 192.168.1.10 192.168.1.9 192.168.1.8 192.168.1.7 192.168.1.6 192.168.1.5 192.168.1.4 192.168.1.3 192.168.1.2
WAN Network
LAN Network