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From: "Colin Alston" <karnaugh@karnaugh.za.net>
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Date: Sun, 22 Feb 2004 22:07:33 +0200
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Subject: Re: unable to ping or connect to freebsd
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> On Sun, Feb 22, 2004 at 01:29:32PM +0100, Sylvain Lemasson wrote:
> > Hi,
> >   I have installed freebsd 5.2.1 and connect it to the
> > network using ppp. it works well. I have access to
> > internet but I am unable to ping the freebsd from
> > another computer. The network card get the ICMP
> > packets but it seems that they are filters whereas no
> > firewall like ipfw are installed. My rc.conf is
> > bellow. As you can see the kernel_secureLevel is
> > disable.
> >
> > ppp_nat="yes"
>
> NAT normally does not allow connections from outside in, or unsolicited
> UDP or ICMP from outside in.  Why do you need to allow that?  Or, unless
> your fbsd box is acting as a router, why do you need NAT?
>

Unless ppp_nat="yes" engages some userland ppp filtering, I see no reason
why that would block ICMP. On my userland PPP setup with NAT enabled ('nat
enable' in ppp.conf iirc) the router still acts as if it were a normaly
connected machine and responds to ICMP echo requests and traceroutes etc.