Re: pppd woes

[Leopold Bloom <leopold-bloom@foni.net>]

On Thu, Mar 14, 2002 at 11:29:56AM +0100, Xander Soldaat wrote:
> Hi there,
> 
> Thorsten Glaser wrote:
> 
> > As a last resort, you may always use squid in transparent proxying
> > mode, if other protocols (DNS, SMTP for example) are working.
> DNS works fine, because the packets are small (usually smaller than the
> MTU). I have tried starting lynx on the firewall machine itself, with
> the exact same results, ie no results, hehe. I don't think putting it in
> transparent mode is going to make much of a difference here.
> 
> > What is you outgoing MTU (on ppp0)?
> It's been set to 1500, 1450 and 1200, on various testing occasions.
> 
> > Try to set the MTU value on the machines on the LAN
> > to something below or equal that (e.g. if I have a slow modem
> > link, my ppp0 has mtu=296 as well as my default route).
> I have set the MTU of my lan machine to 1450, which also didn't work,
> the default route inherited the MTU of my fxp card. (I checked with
> netstat -rnf inet)
> 
> > (Just to be sure, not to humiliate you:)
> > Are you sure your firewall does PASS port 80 KEEP STATE (from any to
> any)
> > and your NAT is NATting correctly?
> I even turned the firewall off and started lynx on the console of the
> firewall, that didn't do much for me either. So it's neither a firewall
> problem or a ppp setup problem, I mean everything works fine as long as
> you keep your packets small.
> 
> I called both ISPs I ran the tests on and they couldn't help me, they do
> support Linux, but have never come across this problem with OpenBSD.
> (Nice to know there are ISPs (demon.nl and xs4all.nl) out there that are
> not allergic to *nix.
> 
> Anyways, I'd really like to hear from someone who has run into something
> similar (and solved the problem). Pointers to docs, faqs, howtos are all
> more than welcome, I am not afraid to read :)
> 
> Gr,
> Xander

I don-t know how your ppp.conf looks like (hint), put i had a similiar problem.
I put 
set mtu max 1488 
into ppp.conf and it worked perfect. In my case this little max-parameter did
it. If it doesn't help, i can send your my complete ppp.conf.

Hope it helps

Alf
> 
> 
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