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RE: [PLUG] routing/networking questions
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-----Original Message-----
>From: "Stephen Gran"<steve@lobefin.net>
>Sent: 9/22/05 9:23:13 AM
>To: "PLUG"<plug@lists.phillylinux.org>
>Subject: [PLUG] routing/networking questions
>
>Hello all,
>
>So, here I am set up in the UK, and facing some routing oddness on my
>home network. First, the description:
>
>I have a routed /29 available to me - 82.71.90.{96-103}
>I have a PPPoATM connection, currently being done by a junk ADSL modem.
>I have a couple of machines providing public services (smtp, http, etc)
>.102 is the gateway between the /29 and the internet - my ISP routes all
> traffic for the /29 to .102, and I use it as my gateway for the other
> machines. .102 is also the address assigned to whatever machine does
> the PPoATM connection.
>
>Leaving aside for the moment that my ADSL modem is junk, I have some
>questions about the best way to arrange the network.
>
>So, whatever machine does PPPoATM has to have 2 interfaces, broadly
>speaking - ppp0 and eth0. This means I have to lose 2 out of 6 usable
>IPs to my ADSL modem, which seems extraordinarily silly to me. I have,
>for the moment, in a bit of truly grotesque inspiration, given eth0 on
>the ADSL modem the address 192.168.1.1, with a /24, and turned off NAT.
>Then I gave it a static route to 82.71.90.96/29 via eth0.
>
>I gave all the machines with public IPs behind it a single static IP
>address in the /29 (.97, .98, etc) and also gave them an eth0:1 in the
>range 192.168.1.0/24 - this second IP in the private range is necessary
>to make arp work. So, now I have 5 out of the 6 IP addresses, which is
>probably as good as I am going to get out of this sort of setup.
>
>But now to the question - can I make this work without having to resort
>to this hack? It seems to me there ought to be some way to make the
>ethernet port on the ADSL modem not have an IP at all, and just act as
>a sort of transparent bridge to the subnet. I do not know if this sort
>of thing is possible with consumer grade hardware, of course, or if I
>am just wishing for something not really doable. I think, also, that
>there are issues with IP bridging between PPP and ethernet, although I
>don't know all the ramifications.
>
>Thanks for any advice,
>--
Stephen, maybe check out the Shorewall site. They have lots of documentation and examples. I think you are making your set up unnecessarily difficult.
Kam Salisbury
http://salisburyfamily.us
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