I have an Embedded device.

It basically uses the Linux as a OS .

It works as a modem i.e having a wan interfaces and lan interfaces .

I Connect my PC to that Modem .

Now that modem becomes a router to me .

i can access that router using the g/w address ex: 192.168.1.1

Now when i type the netstat -aln in that device

i get the following information


tcp 0 0 192.168.1.1:139 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:2420 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:53 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:23 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:4567 0.0.0.0:* LISTEN
tcp 0 0 255.255.255.255:5819 0.0.0.0:* LISTEN


1) here my first doubt is the http service is not running on the 192.168.1.1:80

it is running on 0.0.0.0:80 eventhough in my pc browser if i type the

192.168.1.1 how does it access the webservice.

2) what is this 255.255.255.255 ip ?


please guide me in understanding this network .

regards

0.0.0.0 will mean "all IPs on this machine"

I have seen the implementation of this device.

This 5819 is being used by upnp service

Here it runs a http server , to respond to the upnp requests from clients.

Here in implementation it shows as to listen on ip 192.168.1.1 port 5819

strangley some times the server runs in ip 255.255.255.255 where as debug message shows that the ip provideing to socket is still 192.168.1.1

ofcoures this type of behaviour is not happening regulary . once in 5 times it shows as running in 255.255.255.255:5819 where as in remaining times in 192.168.1.1:5819.

when it runs in 192.168.1.1 upnp is working fine and i could able to see the icon in my network places in my Lan PC .

I could not able to find where is this malfunctioning happening.

Can any body help me in this

regards