Re: network connecting through 56K via linux

From: Daniel Anderson (kd4jdl_at_mtcwireless.net)
Date: 07/22/03

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    To: "redhat-list@redhat.com" <redhat-list@redhat.com>
Date: 22 Jul 2003 16:41:40 -0400

    On Tue, 2003-07-22 at 15:49, Kirby Clements wrote:
    > This is an issue of connections in general, being that I don't even
    > have the firewall turned on yet.
    >
    > The new standalone firewall box I have built is now connecting via PPP
    > with wvdial, a great little tool.
    > The firewall, be it shorewall or if I just decide to use ipchains with
    > lokkit, is off.
    > There will be approximately 25 Windows NT machines behind this linux
    > box, all of them feeding off the PPP connect over a 56K modem.
    > Only one of those NT machines has a static IP address - the rest are
    > all being assigned (by Exchange I guess) 192.168 addresseses.
    > That same NT server machine with a static IP is the mail server, and
    > serves IIS and Exchange, offering UDP connects and so forth internally,
    > while letting the entire network get/send mail.
    >
    > I have assigned the linux firewall a 192.168.0.0 address, being that I
    > don't see that address taken on the network. My issue is that even with
    > the firewall off, I can't get a connection with the other machines.
    > Granted this is a scenario b/c I have been trialing this on my own
    > network first, so I don't take down the actual NT network.
    > I am using the internet services DNS servers, and have assigned a
    > machine of mine a 192.168.0.1 address.
    > The ethernet on the firewall is configured with no gateway since I have
    > read PPP does not need one ( I tried it the other way but still no luck
    > ) and like I stated, the linux box is connecting fine. I just cannot
    > seem to get any of my other machines with 192.168 addresses to connect
    > via their ethernet to the linux box's ethernet, via a dumb hub.
    >
    > I now know I need to masquerade the packets on the network, since they
    > are 192.168 addresses. I have set that up in /etc/sysctl.conf.
    > When I try to connect from a macintosh or windows box, using the linux
    > PPP 56K connect, and using the internet services DNS info, I get
    > nothing.
    > A "dig" either gives me "operation timed out" or "host is down". So,
    > after 10 gruelling hours last night, I am trying to figure out what to
    > do.
    > I have also gone to the point to put client machines 192.168 addresses
    > and names in the /etc/hosts file of the linux box, thinking that might
    > be the trick.
    >
    > What else I have noticed is that in the linux logs, the dialup company
    > used by the internet service (outsourced dialup service) is assigning
    > random DNS server IP's to the linux box. Is this the issue?
    >
    > I will stop here b/c obviously this is enough info on this issue at the
    > moment. Would purchasing a static IP for the linux box help?
    > What am I not doing? I have now got 24 hours to find out :)
    >
    >
    > Kirby

    192.168.0.0 is the network number and cannot be used as an address. you
    need to use 192.168.0.1 or above.
    Dan 

    -- 
Daniel Anderson <kd4jdl@mtcwireless.net>
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