Date: Fri, 13 Aug 1999 11:48:40 +0300 From: "Andy V. Oleynik" <andyo@prime.net.ua> To: Brian Somers <brian@FreeBSD.org.uk> Cc: freebsd-isp@FreeBSD.ORG Subject: Re: Problem with aliasing unregistered IPs on dialup server. Message-ID: <37B3DBE7.F575EF31@prime.net.ua> References: <199908130803.JAA00498@keep.lan.Awfulhak.org>
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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>
--
WBW Andy V. Oleynik (When U work in virtual office
prime.net.ua's U have good chance to obtain
system administrator virtual money ö%-)
+380442448363
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