[EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
>
> The client machine cannot ping the outside world - but it *can* resolve
> DNS using external DNS servers, and it can traceroute to external 
> machines.

Do you have the kernel option CONFIG_IP_MASQUERADE_ICMP enabled?

> The client machine can initiate an http request, but hangs at the
> transferring data stage -- the same happens in Netscape and Lynx under
> Linux, Netscape and IE3 under Windows.

I have seen this before, and it seems to involve IP fragmentation. 
Check the MTU size on your PPP interface.  If it's not 1500, I bet that
is the problem.  You can fix this by adding "mtu 1500" to your
/etc/ppp/options file.

Oops... I just noticed, you said you use SLIP, not PPP.  Well, hopefully
you know how to change the MTU size on your connection, because I don't.  :)

-- 
   [EMAIL PROTECTED] (Fuzzy Fox)      || "Nothing takes the taste out of peanut
sometimes known as David DeSimone  ||  butter quite like unrequited love."
  http://www.dallas.net/~fox/      ||                       -- Charlie Brown
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