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I have currently access to Internet provided via cable modem, with single Ethernet output port. From earlier, I have PENTAGRAM Cerberus P 6331-4A ADSL modem/router. Would it be possible, and how, to configure said ADSL router to serve just as a hub / switch, for sharing my Internet connection. I'm especially interested in using the WiFi part of it.

PENTAGRAM Cerberus P 6331-4A has built-in 10/100 Mbps 4-port switch for LAN, 1 x WAN port for ADSL-type connection, and Wi-Fi 802.11b/g. I want to conect cable modem to one of Ethernet ports, desktop PC to other Ethernet port, and use WiFi connection from laptop.

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This might not be applicable to you (probably isn't), but it is technically possible to through software convert the WAN port to be just another LAN port, to get a 5 port switch. I sadly haven't seen this option with native firmware, but with e.g. dd-wrt and the likes it is often available (I guess your router does not work with dd-wrt (I don't recognize its name, at least), but it can be something to look for anyway - it should probably be a configuration option named "Use WAN as LAN port", "Convert WAN port to layer 2" or similar). – Daniel Andersson Apr 24 at 14:16
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If your ISP can send multiple IPs through the circuit and you get a cheap switch, then you'd pull IPs in parallel by static assignment, keep in mind there is no firewall and your IPs are 100% public with this option. If you turn off DHCP and NAT, then you should be able to use that ADSL modem/router as the switch for this scenario.

If your ISP is only sending you one IP and you can't get more than you must use DHCP/NAT, hence you must use a router.

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On many "home" routers the 4 LAN ports and the Wi-Fi "port" are just switched and not routed. So just connect the ethernet cable from the cable modem to one of the four LAN ports and you should be ready to go (provided that 1. the cable modem has a builtin DHCP server, and the DHCP server is enabled, 2. the router and cable modem are on the same subnet and 3. all clients are set to request an IP via DHCP or they're otherwise manually set on the same subnet).

At home I have a dlink gateway (adsl modem+router+wi-fi ap) that I use exactly like this.

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All routers have only one LAN port, the multi-port LAN portion is always switched. There is no other way, it just happens that they are connected internally on all these "home" devices, and even on enterprise ones. There is no such thing as a router with multiple LAN ports, they must be switched or set on a VLAN. – MaQleod Nov 10 '10 at 20:50
one drawback to this method is that you will not be able to take advantage of any of the security features that plugging into the WAN/Internet port of a stand alone router would provide – Xantec Nov 10 '10 at 20:53
I would have to configure ADSL because it uses different IP subnet (192.168.1.*) than cable modem (86.sth.*.*, if I remember it correctly). – Jakub Narębski Nov 10 '10 at 21:23
if it starts with 86, then you can't change it. A NAT address will start with 192.168, what you have is a public IP that your ISP controls. If that is the case, you need to look at my answer. – MaQleod Nov 10 '10 at 21:48
If it is a modem/_ROUTER_ as you wrote in your question then the 86... must be the external IP and you should be able to configure the internal IP as you see fit. – CAFxX Dec 2 '10 at 11:35
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It's very simple ..just disable your DHCP in the ADSL router and if u have shared your cable internet using Internet Sharing connection then the Internet Sharing connection will provide the IP address for you and enjoy your ADSL router as wi-fi device

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