Generic router not assigning IP?

[stevo1210]

Hello All,

I have a Skymaster 8 Port Network switch that used to assign IP adresses and now wont?!
It used to assign IPs but now the Windows XP taskbar always says Limited or no network connectivity? but its fine under windows 98,ME,2000 but no packets are received, only sent, looks to be that it doesnt respond anymore?

I don't know whats wrong with it.... i opened it up and the caps are all fine .... the circuit looks very simple though, a few resistors, a chipset and a few caps. If give it a manual fixed IP, it works flawlessly, i could see the surrounding PCs but auto IP used work but what happened now?!

The lights at the front all work fine. it powers up fine too. I can only guess now that the computer fixer wannabe (not me) who dropped it on the tiled floor a few times while untangling cords probably screwed it up. The drop was pretty hard.... the cover actually came off?! im having an idea that i lost $45 during that fall.



Im very sure it was fine a while back, it used to work fine, at the time i wasnt even a computer nerd and i could still use the net with it by just plugging in some random cables and setting up a network with windows network setup.

Anyone got any ideas to what may have happened? the IP function just died one day.... as far as i can remember i think it had I.Q caps in it.... not sure.
I'll update it tomorrow when i have time to open it back up.


Thanks.

[pentium]

Re: Generic router not assigning IP?

Network switch

Are you sure you know what a router looks like?

[stevo1210]

Re: Generic router not assigning IP?

Ok, now you have a point, Pentium.

I'm quite confused about the term router and network switch.... I know i learnt it at school.
As far as i know, if i wanted to share my ADSL connection i would buy a router and if i wanted to run a private network, i'd need a network hub or a network switch.

Well the box does say 8 port network switch....

[gonzo0815]

Re: Generic router not assigning IP?

Jepp, usually a switch can`t asing IP numbers. Any way, i have some Skystar switches too, and all have had bad G-Luxon caps at the primary stage in the SMPS. I replace those and the seconadry caps to and i never have had problems again.

[willawake]

Re: Generic router not assigning IP?

how about a simplified example. if you have a switch you have a LAN (Local Area Network). Your lan will have a subnet.

so for instance you set the subnet mask
255.255.255.0

now you can set the ips for the computers connected to the switch as follows

192.168.0.1
192.168.0.2
192.168.0.3
etc.

youd give the computers the IPs statically or you could have a DHCP server assigning the IPs from a range.

the switch allows the computers within the same subnet of the lan to connect to each other.

but now you want to send traffic outside your LAN. you want to connect to a server on another network. you cant do that with a switch. you will need a router on both networks and then the routers can figure out how to pass traffic between the two networks. the routers provide the WAN (wide area network) link.

so yeah accessing the internet means you are going outside your subnet so you need a router if you wanted to connect your network to the internet. I doubt if your switch is assigning IPs....

what model of device are you using to connect to the internet?

[stevo1210]

Re: Generic router not assigning IP?

well, right now im planning to run a private network for gaming but this switch wont work properly.

But on the other hand i do have a DLINK DSL-G604T wireless router with 4 LAN ports and ADSL modem, like an all in one thing. I use it to access the net and also send my wireless transmission. It could be used for gaming too....

That works well.

[gonzo0815]

Re: Generic router not assigning IP?

Well, the D-Link is a gateway, it includes an DHCP server. Thus it can asing IP numbers. If you only have an switch in your network, you have to set the individual IP numbers at every system as a static one like Will has explained. A switch does nothing than passing the the messages from the concected devices to their destination port. I don`t think that there is any failure of this switch, as long you don`t have setuped the network manualy.

[stevo1210]

Re: Generic router not assigning IP?

I have some images of the internal components, anyone have ideas to any of these components? The caps are KHC? havent heard of them before. I'll send more pictures afterwards.... my cameras battery just died, sorry, i could only get two images up.


Thanks.

[willawake]

Re: Generic router not assigning IP?

he circuit looks very simple though

no shit. theres not much there.

anyway its not going to assign ips

If give it a manual fixed IP, it works flawlessly

so its working as it should

the only way ips will be assigned is if you connect it to the d-link.

[stevo1210]

Re: Generic router not assigning IP?

Thank you very much, Willawake and everybody else. I have success now, after connecting it to the D-Link Router it works fine and IPs are also assigned automatically.
I guess that the switch is all fine now, turns out nothing was really wrong with it.... maybe apart from missing screws, but that can be fixed easily.

Thank You

[gonzo0815]

Re: Generic router not assigning IP?

He he he i am not shure if you have learned the lesson , any way if this switch will someday refuse to boot up, or realy won`t work, than you can replace those KSC crap caps. I have found some of them in many PSu`s 5v SB supply circuit, and they are failing alway very early and realy worse with severe bulging & leaking. But this is probably not only due the inferior quality of those caps, but more likely as those PSU manufakurers have used caps with inadequat ripple capability. That said, i think they should last some time under that not that harsh conditions in your switch.

[stevo1210]

Re: Generic router not assigning IP?

Thanks gonzo0815, i am actually considering to recap this switch just to be on the safe side.... They are currently KHC 470uf 25V -40+105.
If i get around to recapping it, do the capacitors have to be low-ESR.... i am only guessing that the current caps are general purpose because they are in a network switch?
If they are just General purpose capacitors then i can replace them with the Hitano brand capacitors at my local electronics store.

Thanks.

[gonzo0815]

Re: Generic router not assigning IP?

The left side of the circuit is an MC3XXX SMPS, thus i would use high quality long endurance low esr caps like Panasonic FC FM or equivalent series from others. I would certainely not use ultra low esr caps for thsi circuit. The VRM on the right side is an linear converter, thus you can use GPO caps or the same as on the left side. But i would avoid again ultra low esr caps on this circuit too. The other caps, i would use something very long lasting like Rubycon ZLH or similar. But GPO caps would be fine to. Anyway, i would use for anything 105°c rated caps.