MiamiDX, ADSL, DMZ and the Amiga..

[JurassicCamper]

Mad-Matt wrote:
Im using NTL Cable on my Amiga via A Belkin 4-Port router (about £50), although i used the pc to initially setup the modem before plugging router in.

Initial problem was getting the Amiga to stay online, ,as it was using dhcp to get an ip from the router. Solution was to make the IP static (same ip that router issued via dhcp)

Since i use Amiga mostly for irc I chose to make the Amiga IP the one to enter in the DMZ (Since only one ip can be entered on this router)  This disables the router wall for that IP. (was required to make DCC work)

So i use Miami IP Filters to enable/isable ports i wish to use (also this router doesnt seem  toallow port ranges so can only open individual ports via a trigger port).

this method is working ok for me

For the belkin 4 port router.... and Miami...

Enter the setup 192.168.2.1 and change your DHCP lease time to anything appart from forever.
Mines currently set at 24Hours.
You always get back the same IP address anyway as this is based up the MAC Address of the  Ethercard you are using. If the MAC address stays the same you'll  get back the same IP.

I would not recommend putting the Amiga in the DMZ, just use the belkin to open what ports you need.
Eg: If you want to run a FTP client open up port 21 and steer it to your Amiga's IP address. . If you want to control your Amiga remotely via telnet open up port 23 etc.

If you have the Amiga in the DMZ and you file share using samba your opening your self up for attack.

Langaurd for the PC is a bit of software aimed for commercial networks. However Its on Kazaa and allows you to scan all 256 pc's on a particular subnet. Its comes back and tells you what clients it found, what ports are open and then at the click of a button takes you to a website that shows you how to explote that open port.
 
Many wanabe hackers use this lots on ADSL / Cable networks.

Believe me keep it out of the DMZ

[JurassicCamper]

Your service provider, be it ntl: BT, Telewest, will only let you have 1 IP address for the ADSL / Cable  Modem, this is where the router comes in as it gets assigned your 1 IP address and then uses NAT translations to steer the traffic to the desire local IP address assigned by the router.

Let your router do what is designed to do, route traffic.

You can then network your computers behind the router as they will get IP address on the same subnet using the same subnet mask.

If you can then share drives using samba or windows / netbios. This has to open up ports. TCP or UDP depending on the protocol you are using. Behind the router this OK because your ports are only open to each other behind the router.

If you then put one of these machines in the DMZ your basically saying route all TCP / UDP ports request to the IP address of my router to all machines on in the DMZ. So If you have shared a drive its available for others as well. By keeping it in the DMZ you can then open ports up as and when you need them, so if you find a program is not working becuase it needs a specific port, then open it up.

For Example:

1 Windows PC, 1 Amiga & a Router

Your router will  get assigned an IP address of 80.1.20.12 for example, from your service provider.
Its has a local IP address of 192.168.2.1 used for you to login / its your gateway aswell.

Your router will assign the Amiga an IP of 192.168.2.2
and the PC 192.168.2.3

If you then want to run an FTP server you need to think about how packets will get to it.

If you then wanted to FTP to the Amiga from somewhere on the internet, say work for example What IP address would you use ?

192.168.2.2 or 80.1.20.12.

Well if you use the first you'll most likely end up with with somebody elses PC or Router. If you use 80.1.20.12 your right but,  your router has no FTP server client on it.
FTP uses TCP IP port 21
So you then have to tell the router what to do if it get a requesting coming in on IP 80.1.20.12 / TCP port 21.
You tell it to steer requests to 192.168.2.2.
Same if you want to run apache, just tell the router to steer traffic request to your amiga or PC depending which one has the client running.

Your website would then be http://80.1.20.12

Simple when you get your head round it.

[JurassicCamper]

@ Stom

One thing to remember some cheasperASDL modems don't have ethernet RJ45 ports and are USB only (Freeserve), so you have to connect it to a computer that support networking over USB. Think of it like MiamiDX built in Serial Driver for an external 56K modem.

Some ASDL Routers dont have USB ports only RJ45.

Your gonna have to connect your modem to your router and if ones usb and the other is RJ45.... well you see the problem.

Best option is for a modem that has a Enternet connector on it.

So it goes:

Coax or Phone Line---Modem---Router---Computers

[JurassicCamper]

check ebuyer.co.uk

They start at about £30 these days + they are doing free delivery at the moment .

If you buy a router with a print server like a Baricade from SMC you can use the NetPAR software that was one of the contributions with OS3.9 so they can both share the printer.