From owner-freebsd-net  Thu Nov 23 13:29:45 2000
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Subject: Re: PPPoE, nat, dsl, some web sites 
In-reply-to: <004b01c04f4f$4ebe9f20$0402010a@biohz.net> 
Date:	Thu, 23 Nov 2000 16:29:16 -0500
From: Samir Girdhar <samir@cs.toronto.edu>
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On Wed, 15 Nov 2000 16:59:20 -0500  "Renaud Waldura" wrote:
> Sounds like the infamous PMTU problem. Read this, section 6.3 especially:
> http://renaud.waldura.com/doc/freebsd-pppoe/
> 

I've been using the NAT capabilities built into ppp(8) and have
had no problems maintaining simultaneous connections to multiple
DSL providers (default route through my ISP, static routes to
the university) -- it properly NATs the traffic going out each
link.

But with the problems around the PMTU/MSS/broken routers, I've
been looking at tcpmssd as a workaround.

However, the docs indicate that it needs to work with natd(8)
but, from what I've been reading, it seems to me that natd
can only handle one external interface.  It doesn't look like
running a separate instance for each external interface is the
answer, either.

When I get some time (ie. after LISA) I intend to try a few
different things including:

  - trying to run two natds
  - diverting to tcpmssd before passing the packets to ppp
    for NAT
  - having ipfw/natd/tcpmssd take care of the traffic going
    to my ISP and ppp+NAT take care of the traffic on the
    link to the university (but then I haven't addressed
    the PMTU breakage on this link)

Anyone have any suggestions?  Have I missed something obvious?
Someone must have faced this sort of thing already, no?

Thanks,
Samir


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