Date: Fri, 13 Aug 1999 11:09:54 +0100 From: Brian Somers <brian@FreeBSD.org.uk> To: "Andy V. Oleynik" <andyo@prime.net.ua> Cc: Brian Somers <brian@FreeBSD.org.uk>, freebsd-isp@FreeBSD.ORG Subject: Re: Problem with aliasing unregistered IPs on dialup server. Message-ID: <199908131009.LAA27283@keep.lan.Awfulhak.org> In-Reply-To: Your message of "Fri, 13 Aug 1999 11:48:40 %2B0300." <37B3DBE7.F575EF31@prime.net.ua>
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You need to run the aliasing software on the external interface - in
your case, either the external BoxB interface or have the client box
run it.
Running it on the private interface of Box B doesn't work :-|
> Brian Somers wrote:
>
> > >
> > > No, it knows. I can ping from client ppp server and other hosts residing on
> > >
> > > the same ethernet in the same subnet can too . Also I can reach 10.0.0.1
> > > client from ppp server
> > > and these hosts. I understand that while ppp-server has direct route to the
> > > client and
> > > other hosts on the ether have this ppp-server as defaultrouter they can
> > > reach client.
> > > But hosts from outside this subnet, such as host that is defaultrouter for
> > > my ppp-server
> > > doesnt know how to reach 10.0.0.0/24 hosts and they sends their repleys to
> > > their
> > > defaultrouters - checked with tcpdump. And my question was why ppp doesnt
> > > alias the
> > > packets from unregistered networks. I think ppp have to works like natd in
> > > this case.
> > > I.e. every packet from unregistered have to be resent to destination by ppp
> > > with its own addr.
> > > And answers have to be retransmitted to the client. Isnt it? What is the
> > > reason of my failure?
> >
> > If you've got the following setup:
> >
> > ------- ------------- --------
> > 'net---| Box A |-- LAN --| Box B (ppp) |-----| Client |
> > ------- ------------- --------
> >
>
> No, but similar:
>
> _______
> ________
> INET------|BOXA|---PPP-leased-multi-line---|BOX B |---PPP-dialup--|Client|
> ----------
> -------------
> On the BOXB ppp-server side I have aliasing with:
> alias enable yes
> alias unregistered_only yes
> BOXB have real IP. All the packets from Client go w/o aliasing through the BOXB
> outside the subnet.
>
> >
> > You need to run the aliasing software on the 'net side of Box A and
> > make sure that Box A knows how to route to Client via Box B (10/24)
> > so that it makes everything look like it comes from itself when it
> > transmits to the 'net and so that it knows what to do with the
> > replies when it gets them back.
> >
> > My suspicion was that Box A didn't know how to route to Client via
> > Box B.
> >
> > If Box A can talk directly to Client, and Box A runs either natd or
> > ppp -alias on it's 'net interface, there should be no problem.
> >
> > > --
> > > WBW Andy V. Oleynik (When U work in virtual office
> > > prime.net.ua's U have good chance to obtain
> > > system administrator virtual money Ã%o)
> > > +380442448363
--
Brian <brian@Awfulhak.org> <brian@FreeBSD.org>
<http://www.Awfulhak.org>; <brian@OpenBSD.org>
Don't _EVER_ lose your sense of humour ! <brian@FreeBSD.org.uk>
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