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參數(shù)資料
| 型號： | MB86977 |
| 廠商： | Fujitsu Limited |
| 英文描述： | IP PACKET FORWARDING ENGINE |
| 中文描述： | IP數(shù)據(jù)包轉(zhuǎn)發(fā)引擎 |
| 文件頁數(shù)： | 10/30頁 |
| 文件大?。?/td> | 149K |
| 代理商： | MB86977 |
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MB86977
10
I
FUNCTIONAL DESCRIPTION
1.
FEF Engine-NAT/IP forwarding function
The FEF Engine-NAT/IP forwarding macro accelerates NAT transformation and IP forwarding through hardware,
eliminating the use of software, i.e. host processing. Up to 128 NAT/IP forwarding connections, each defined by
the parameters set in the NAT/IP forwarding table, can be configured. These connections are the transmission
paths that connect the WAN and D.M.Z. interfaces, the WAN and LAN interfaces, and the D.M.Z. and LAN
interfaces-all at full wire speed.
The IP forwarding and NAT operations are briefly explained below.
IP Forwarding
When both the destination and source IP addresses of an input packet matches one of the entries in the NAT/
IP forwarding table, the packet is forwarded through hardware to the destination interface indicated by the
matching entry. This transmission does not require host processing and is performed at full wire speed. If there
is no entry in the NAT/IP forwarding table that matches both IP addresses (destination and source IP address)
of the input packet, the packet is sent to the host through the host interface.
Described below is the operation performed on the packet when IP Forwarding is being applied:
MAC address replacement
TTL subtraction
IP header checksum recalculation
Ethernet frame CRC recalculation
Transmission from the destination interface indicated
As for IP forwarding, both IPv4 and IPv6 type packets can be processed.
NAT
When the destination and source IP addresses and the destination and source TCP/UDP port numbers of an
input packet matches one of the entries in the NAT/IP forwarding table, the hardware translates the address,
replaces the port numbers, and forwards the packet to the destination interface, all according to the parameters
defined by the matching entry. This transmission does not require host processing and is performed at full wire
speed. If there is no entry in the NAT/IP forwarding table that matches both IP addresses (destination and source
IP address) and both TCP/UDP port numbers of the input packet, the packet is sent to the host through the host
interface.
Described below is the operation performed on the packet when NAT is being applied:
MAC address replacement
TTL subtraction
IP address replacement
IP header checksum recalculation
TCP/UDP port number replacement
TCP/UDP header checksum recalculation
Ethernet frame CRC recalculation
Transmission from the destination interface indicated
As for NAT, only IPv4 type packets can be processed.
AH and ESP input packets are not subject to NAT translations.These types of packets are sent to the host through
the host interface.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MB86977PFV-G-BND | IP PACKET FORWARDING ENGINE |
| MB86H20 | SmartMPEG |
| MB86H21 | MPEG-2 Decoder with Integrated NDS ICAM |
| MB86H22 | MPEG-2 Decoder for ext. Temperature Range |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MB86977PFV-G-BND | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:IP PACKET FORWARDING ENGINE |
| MB86A21PMC-G-BNDE1 | 制造商:FUJITSU 功能描述: |
| MB86A21PMC-G-JNE1 | 制造商:FUJITSU 功能描述: |
| MB86A22PMC-ES-BNDE1 | 制造商:FUJITSU 功能描述: |
| MB86A22PMC-G-JNE1 | 制造商:FUJITSU 功能描述: |
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