Re: PPP Lan Bridge

From: Brian Somers (brian_at_Awfulhak.org)
Date: 03/22/05

  • Next message: Chris Tusa at Linisys, LLC: "Re: PPP Lan Bridge" 
    Date: Tue, 22 Mar 2005 22:02:54 +0000
To: "Chris Tusa at Linisys, LLC" <linisys@gmail.com>

    Hi,

    The netmask for the rest of the network should remain the same so that
    each machine still thinks it's talking on a /24 (the ppp server is
    responding to ARPs so nobody can tell that the ppp server isn't actually
    just a multi-homed host).

    Only when a packet gets to the ppp server is it actually routed (which
    happens because the IP number doesn't match after all -- despite the
    ARP table).

    I guess the missing bit is that the timeclock machine needs a special
    routing table with 192.168.1.234/30 on it's crossed-over ethernet
    interface and 192.168.1.233 as the default route, allowing data to
    get back to the rest of the /24 subnet.

    When you get it all working it'll start to make sense (if it doesn't
    already).

    On Tue, 22 Mar 2005 14:06:21 -0600, "Chris Tusa at Linisys, LLC" <linisys@gmail.com> wrote:
    > Brian,
    >
    > Very helpful. Someone on another forum suggsted the possibility of
    > adjusting routing using either a routed daemon or setting static
    > routes, but it seems that your method seems quicker. If I segment off
    > the PPP side, do I need to change the subnet mask on the rest of the
    > network as well?
    >
    > (I should know this!)
    >
    > -- Chris
    >
    >
    > > The issue is that 192.168.1.0/24 machines have to know to route
    > > 192.168.2.0/24 stuff through 192.168.1.230, or else the timeclock
    > > machine needs some sort of presence on 192.168.1.0/24.
    > >
    > > This can be done by allocating a segment of 192.168.1.0/24 to the ppp
    > > client and adding ``enable proxyall'' to the ppp server config.
    > >
    > > server:
    > > enable proxyall
    > > set ifaddr 192.168.1.230 192.168.1.232/30
    > >
    > > client:
    > > set ifaddr 192.168.1.233 192.168.1.230
    > >
    > > and then setting the addresses on the crossover cable to 192.168.1.233
    > > and 192.168.1.234.
    > >
    > > The ``enable proxyall'' bit tells ppp to create proxy arp entries for
    > > all of 192.168.1.232/30 (except for .232 and .235), allowing everything
    > > else on 192.168.1.0/24 to think it's talking directly to these machines.
    > >
    > > --
    > > Brian Somers <brian@Awfulhak.org>
    > > Don't _EVER_ lose your sense of humour ! <brian@FreeBSD.org>
    > >
    >
    >
    > --
    > Chris Tusa
    > linisys@gmail.com
    > http://people.linisys.com/ctusa
    >
    > Buy books from my Half.com inventory:
    > http://half.ebay.com/shops/shops.jsp?seller_id=1691584
    > 

    -- 
Brian Somers                                          <brian@Awfulhak.org>
Don't _EVER_ lose your sense of humour !               <brian@FreeBSD.org>
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  • Next message: Chris Tusa at Linisys, LLC: "Re: PPP Lan Bridge"

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