Re: Netfilter(MASQ) and PPPoE problem? (2.4.17)

[crispin@iinet.net.au]

Is it your MTU on your local network causing fragmentation? Read the PPPoE Howto. It explains about these problems that are common with some providers DSL networks.

Kind Regards
Crispin

On Wed, Jan 30, 2002 at 01:50:40AM -0500, Malcolm Mallardi wrote:
> 	Heyla, folks.  I've got an interesting little report for y'all,
> was hoping to get a bit more insight, 'cause I'm rather stumped on it,
> and can't really make heads or tails of it.  I've got a DSL with PPPoE
> set up on the router (running 2.4.17, with NAT) and seem to be having
> problems getting to web sites from client machines behind the firewall.
> 
> 	What makes it so curious is that this happens with only a
> selection of web servers out there, though the number for me seems to be
> growing, unfortunately.
> 	When I use Lynx from the router, I can get to any site out
> there on the Internet that I choose.  My fire walling rules are simple:
> Accepts everything incoming, and outgoing, and masquerades anything
> going out from the LAN to the world beyond through the interfaces of
> ppp0 and ppp1 (ppp0 being the PPPoE interface through eth1, ppp1 being
> the 'backup' dial-up service.)
> 	The other curious thing is when I route traffic to a troubled
> site through the modem interface (ppp1), I can access things just fine.
> 
> 	After wading through some packet captures targeting this
> problem, I've noticed that when sending a request from one of the
> machines behind the NAT box, the standard handshake is processed, then
> the HTTP get is sent, and the connection is dropped immediately, but
> from the NAT box itself, there's an ACK sent, then the Web server sends
> the information with a HTTP/200 response.
> 	
> 	I've been trying to puzzle this out for weeks, and due to all
> the mitigating factors, the only theory that I can come up with is a
> possible bug in the interaction between MASQ and PPPoE, as switching to
> the straight PPP account works just fine.
> 
> --
> Malcolm D. Mallardi - Dark Freak At Large
> "Captain, we are receiving two-hundred eighty-five THOUSAND hails."
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