Date: Sun, 22 Mar 1998 17:42:11 -0500 (EST) From: "Christopher R. Bowman" <crb@ChrisBowman.com> To: Brandon Lockhart <brandon@engulf.com> Cc: freebsd-isdn@FreeBSD.ORG Subject: Re: ISDN Message-ID: <Pine.BSF.3.96.980322173446.287A-100000@quark.ChrisBowman.com> In-Reply-To: <Pine.BSF.3.96.980322125554.8679A-100000@engulf.com>
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On Sun, 22 Mar 1998, Brandon Lockhart wrote: >I have an ISDN question, (go figure, I am writing this list), well, a few >of them. I will be getting a dedicated ISDN line called "CENTREX" from my >ISP soon. I am not sure if they are going to support compression, but I >would like to get a router that supports 4:1 anyway. I have been looking >at the Ascend Pipeline 50 for awhile now. But I am unsure about what I >can do with it. I was reading on the Ascend site that the Pipeline 50 >will disconnect, then once a connection is attempted, it would connect. >And it would only use one B channel until 2 where needed. Is there a way >I can turn that option off? So I am always connected and both channels >are always in use. Since this is a dedicated connection, I won't be >getting billed for my time online, so I might as well have full capacity. > >Also, do you recomend any other sort of router that I should look into? >So far I know I need a few things. The router should be able to be >plugged directly into my HUB, it should bond both channels for me already, >without any special configuration. If the config is easy, that is fine >too. I would like one where I can filter TCP and ICMP packets, but that >is not necessary. Also, I have a question about the way the router is >used. Below are some drawings. I hear that the netopia routers from farallon are nice. _____ Computer 1 >====isdn line from phone company===<Router>--<Hub>'----- Computer 2 > `----- Etc.. > >Is that how a normal configuration would go? Say Computer 1 was FreeBSD, >and #2 was Windows NT. I would have 16 IP's for 3 computers on this >particular example. With the router, could I assign 1.1.1.2 though >1.1.1.14 to the FreeBSD machine, 1.1.1.15 to the windows NT machine, >1.1.1.16 to the other computer, then 1.1.1.1 to the router. Would I make >the gateway for #1, #2, and #3 1.1.1.1? What would the broadcast be? If >I assigned those addresses to the FreeBSD machine for VHOSTS, would I have >to do anything to the router? Below is an example I am curious about. If you are subnetting the block of 16 addresses, then right away 2 address' are reserved, the zero, and all ones addesses identify the network, and it's broadcast address respectively. >====isdn===<Router>==<Computer #1 (firewall)===<hub>--- Computer #2 > `-- Computer #3 >Then would I make 1.1.1.2 (#1) the gateway on #2 and #3, and on #1 make >the gateway 1.1.1.1? yes >Third and final true question, If I got a regular ISDN router, would I >need a TA? Ok, 4th question, last, honestly, is all this trouble worth >it? Depends on the router, most I have seen have the TA built in, but I think there are some where it is an option, sometimes the documentation say S/T interface sometimes U interface, I forget though which one means built in TA. It probably is worth the effort, and is probably even easier than setting up a workstation with a TA, and doing the routing on that. >To Unsubscribe: send mail to majordomo@FreeBSD.org >with "unsubscribe freebsd-isdn" in the body of the message > > --------- Christopher R. Bowman crb@ChrisBowman.com <A HREF="http://www.ChrisBowman.com">My home page</A> To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isdn" in the body of the message
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