| The home gateway, also high speed broadband router, had 1 wide area network (Internet) interface and 4 local area networks (LAN) interface generally. Usage range is at present very wide. On secondary, it is applied to hang building the family network sharing; But LAN + ADSL meeting enters way from the finiteness , reason why analysing on the technology, because of wide area network IP resource, being able to replace the route implement in the past in small enterprise and branch office, price only has several one tenth of tradition route. At present take a look on that, it has realized many family platform PC data share and Internet has linked a share; and in the long run, it is to prop up future figure family network infrastructural facilities, one of the forceful competitor who is a family network control centre.That the at present most home gateway all is to change by the fact that the software carries out the IP data converting, surely is able to bring about certain over loads to CPU , function effect is right away more obvious especially during the period of the large amount of data transmission carrying out the high speed broadband. The defect resolving a scheme being common existence's specifically for this is similar to a product studied by problem (the data bag coming to carry out IP pure software way changes) , changing being put into use thereby coming to help the software algorithm to accomplish the IP data bag commonly the hardware. The loads having reduced CPU thereby greatly, have made the gateway function get the quality up.That this scheme is put into use on the hardware is a Winbond (Hua Bang ) W90N740 chip group , core is owing to ARM7TDMI, from being able to satisfy application such as general network and data memory on usage, can add NATA (the network address changes the hardware acceleration), from the problem resolving the family gateway CPU excess load fundamentally. uClinux is the Linux simplification printing plate on the software, its basic easy to use nature and Linux is consistent , the field relies on whose stable , fine transplanting , excellent network function in implanting style , merit such as nimble complete document system and a lot of technologies hold out gets extensive . Netfilter network fliteration is that a mature IP data bag handles a frame , makes use of the now available Netfilter frame and arranges the NATA hardware acceleration function in groups tier per se in uClinux , can develop out the fine family of outstanding compatible of one function gateway product right away.The job studying are what process middle relates that is included mainly: 1. The environment hanging builds intersection compile and translate; 2. UClinux-2.4.20 kernel transplanting and allocation; 3. Netfilter network fliteration tier of frames studying in a deepgoing way; 4. Netfilter joins modification tier adding the NATA hardware acceleration function code; 5. Make use of the Iptables implement to realize network relevance allocation and to develop the Helper module being not that uPnP applies.Ultimate problem target can provide one entirely resolving a scheme owing to functional new hardware acceleration generation gateway. Be able to embody out obvious function lifting during the period of reality tests, need to keep original Netfilter frame completeness and the stability at the same time also. And the consumer manages and deploys the way facing mainly page by Web, provide the newer firmware (firmware) update function. Problem makes the improvement going a step further specifically for application compatible facing the gateway product , the way being applied or used universally at present comparatively is the main direction supporting the interactive agreement of uPnP , this and perfecting to be also follow-up studying. |
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