Re: setup of NT sub-ISP

mauro ( (no email) )
Mon, 8 Dec 1997 09:56:09 -0300

16 IPs won't do it anyway.
12 Ips (1 per async port)
1 RAS (near side of the async connections)
1 NT Ethernet
1 Router Ethernet.
Total 15 (you have 14 usable IPs on a 16 IP block)

You'll have to give them 32.

-----Original Message-----
From: Donald E. Swett <>
To: <>
Date: Monday, December 08, 1997 1:37 AM
Subject: Re: setup of NT sub-ISP

>I believe the original message mentioned 12 modems (pool) and an NT
>machine and a router. That is 14 and all you will get out of a 16 number
>I think there was also mentioned a LAN (which may or may not need ip
>addresses depending on whether or not you use the proxy server.
>A complete class c may not be necessary, depending on the size of the
>LAN, but 16 won't do it if you assign an ip to each machine on the LAN.
>Either way, it was food for thought, and then only because Clara asked.
>-----Original Message-----
>From: Mitchell B. Wagers <>
>To: <>
>Date: Sunday, December 07, 1997 9:32 PM
>Subject: Re: setup of NT sub-ISP
>>class C? IP's on a 16block set are not a Class C
>>At 09:22 PM 12/7/97 -0500, you wrote:
>>>You also need to make a decision about the wingate proxy server.
>>>there are things to be gained by using a proxy server, if not set up
>>>it can cause some problems.
>>>If they are going to have their own class c address and with a satellite
>>>I don't think the proxy will be necessary unless there is a problem with
>>>and they want to keep the local LAN separate from the internet. In this
>>>they may still want to use the proxy server.
>>>Using ip forwarding is the wrong way to go in either case. If all
>>>are on
>>>the users class c. you wouldn't be routing though the NT, and if you
>>>use the proxy, ip forwarding will allow you to go around the proxy and
>>>through it.
>>>-----Original Message-----
>>>From: Mitch Wagers <>
>>>To: <>
>>>Date: Sunday, December 07, 1997 5:13 PM
>>>Subject: Re: setup of NT sub-ISP
>>>>Um....Here's how it should be done if I understand you correctly. The
>>>>router will also gain a bunch of performance running by itself instead
>>>>relying on a host and is also easier to manage. If you assign him a
>>>>of 16 IP's with the *correct* subnet for those 16 IP's. (I.E. you can't
>>>>remove a chunk of your Class C) and he connects to YOU with HIS IP, then
>>>>here is what I would do (although I recommend using your IP for his
>>>>WAN interface and his IP for his Cisco Ethernet0 interface):
>>>>His router should have an IP on his subnet. If the NT Server is .80,
>>>>set the router to .81 or .82 (anywhere in there) WITH the correct subnet
>>>>the Ethernet0 Port, you should not have to use two IP's for the router.
>>>>gateway on the router is set for your "Access Server" that he connects
>>>>(the router is what connects to you, not the NT Machine). Then, there
>>>>be a flagged route (labeled NL) which the Cisco's IP and your Access
>>>>He should then add the route: " your.access.server.ip
>>>>permanent" The "permanent" command depends on the IOS he is running. Do
>>>>turn on RIP, IEGRP, etc, etc...just default routing!
>>>>If he connects to you via one of YOUR IP's (i.e. not on his subnet),
>>>>the Ethernet0 interface of his Cisco is still be one of HIS IP's, but
>>>>"controller" or wan interface would be the IP he connects to you with
>>>>IP you give him upon connection, needs to be static for best results).
>>>>Then, the gateway on his Cisco needs to be set to your Access Server,
>>>>as before. The NL route will be different than the above, however. Add
>>>>same default route as above.
>>>>He should really be connecting to you via one of your IP's and not his
>>>>Therefore, his Router will have two IP's, each from a different network.
>>>>not sure I covered everything, but configuring a Cisco router is a bit
>>>>entailed than just two paragraphs.
>>>>Mitch Wagers
>>>>Network Operations Manager
>>>>At 11:41 PM 12/7/97 +0200, you wrote:
>>>>>I will start by specifying that I am working for a Solaris based ISP,
>>>>>therefore I thought I could get help from you ,(NT ISPs), in the setup
>>>>>of an NT sub-ISP for one of my clients.
>>>>>That client now has the following setup:
>>>>>NT 4.0 server running mdaemon server for mail and wingate as proxy.
>>>>>That client also has Routing and Ras server running on that server, and
>>>>>accepts dial-in connections on 12 modems.
>>>>>he provides the internet connection to these dial-in connections, by
>>>>>dialing out to our services (DUN of NT 4.0), where he is assigned a
>>>>>static IP u.v.w.178.
>>>>>we also provided him with a subnet of 16 IPs x.y.z.80.
>>>>>The x.y.z.81 is assigned to the server. the modems are served from a
>>>>>pool (the rest of
>>>>>the subnet)
>>>>>this subnet is routed (in our routing tables) thru the static IP
>>>>>Now that client bought a cisco 1005 router, and will be connected to
>>>>>services thru a microwave link. The modem (cisco 1005), boots from a
>>>>>TFTP server (installed on the NT 4.0 server)
>>>>>later on, that client will extend the Internet access also to his local
>>>>>I am wondering on the configuration that should be done after
>>>>>installation of the cisco router. I planned the setup as follows,
>>>>>add or rectify :
>>>>>1- assign another subnet of 16, e.g s.r.t.80 , for the LAN.
>>>>>assign for example s.r.t.81 for the NT server ethernet, and s.r.t.82
>>>>>the cisco ethernet port.
>>>>>2- on the NT server, enable IP forwarding (in order to have all the
>>>>>dial-in connections routed to the ethernet of the server, and from
>>>>>to the router ethernet, than to the router serial port which is linked
>>>>>to our services).
>>>>>3- on the NT server, also specify s.r.t.82 (ethernet of cisco router)
>>>>>a TCP/IP gateway in network/protocols/TCPIP gateway.
>>>>>3- in our routing tables, change routing of subnet x.y.z.80 to have the
>>>>>x.y.z.81 IP (NT server) as a gateway.( or isn't it necessary ???)
>>>>>4- on the LAN PCs, specify s.r.t.82 as a TCP/IP gateway.
>>>>>5- what should be the TCP/IP gateway address for the clients dialing
>>>>>into the NT server ??? x.y.z.81 ??
>>>>>are there any static routes that should be added on the NT server ???
>>>>>Please advise on the best setup.
>>>>>thank you,
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