router RAX20 access point, static IP and LAN ports down

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pio wrote:

my ISP provide me address 192.168.41.4 and 192.168.41.5 (private address)

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That's a strange approach for an ISP. Reads more like cheaply shared Internet connection, kind of a design low cost office spaces to provide "Internet".

Does this mean your "ISP" does just allow you to use two IP addresses on a much bigger IP subnet, like 192.168.41.0/24 or 255.255.255.0 subnet? 

And in the original set-up you had used a shared netwok where many more devices/offices are connected, for a single computer (on .5) and one server (on .4)? 

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pio wrote:

and now i have one interface from my ISP one cable.

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How were the two systems (computer, server) connected before? Either your ISP (ready to me more like a building network or office space provider) connected before? Are there two ports available to you? 

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pio wrote:

on 192.168.41.4 i have DMZ and my exterenal address is conected. this address i set on my server

i put it on RAX20

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Does this mean there is a public routeable IP address NATed 1-1 so all ports are consumer device like "DMZ" available, and here you had a connected a server before...

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pio wrote:

i put it on RAX20

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...and now you have disconnected the server from this port and installed the WAX20 WAN/Internet port here? 

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pio wrote:

than i connect server to RAX 20 on LAN port

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You could to this, but the server will need a lan ip from the RAX20, reserverd, like 192.168.1.5, and configured the DMZ to this IP again. Very unlucky to have that many NAT routers in the line then.

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pio wrote:

I want have wifi for cell phone user on IP 192.168.41.5 and server should work on address 192.168.41.4 (because of DMZ)

When i set router on access point mode server work but only one user on cell phone can connect when he set IP 192.168.41.5 on his wifi

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With just two iP addresses from this subnet, you can't connect more than two systems. Either you challenge this "ISP" to reserve a bigger IP range in the 192.168.41.0/[unknown subnet mask here] so you can add the router (in Access Point mode), and muliple mobile phones ... but for these you should have  DHCP service, as fixed IPs just for a specific site on a mobile are unhandy on a mobile device. And here the unknonw other use of this "Internet" network does come in again... Want is nice - but you simply can't ...

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pio wrote:

I try to set IP in access mode for router 192.168.41.5 and cell phone user work but LAN ports goes down.

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...as your experiment proofs. You can't make wonders with just two IP addresses and connect server, computer, router, mobile phones to one network.

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pio wrote:

Could someone help me ? or explain what i do wrong :)

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If this "ISP" can't help any further (say assigning more IP addesses and have a DHCP service for your office network) you need some redesign.

What I would do with two "Internet" addresses available (one as DMZ port):

• Build a dedicated LAN using your router, e.g. the RAX20, on a network different than 192.168.41.0, ...
• In case you have dedicated ports on the wall for both .4 and .5 systems, no switch required - just use what's there and readily available. Otherwise, connect a small switch to one of the ISP ports, to the server (keep numbering, DMZ .4 et all), and to the RAX20 WAN/Internet port (.5).
• Configure an additional network adapter on the server to router LAN IP subnet.
• Set-up your WLAN on the router
• Enjoy your own local [W]LAN.
• optional: Change the server config in a way that only Internet-accessible services are available on the adapter hanging on the DMZ port.

Regards,

-Kurt

PS. Very difficult to Google a solution if one does not know what to search for...