DSL Troubles

[Net Llama!]

I'll bet good money that the problem is the MTU.  DSL has a 'black hole'
where you need to have an MTU of no greater than 1492 or 90+% of the
traffic gets dropped.  Run ifconfig to see what its set at, and reduce it
to 1492 if needed.  You might even need to reduce it more (do it in 8 unit
decriments) until you get a noticable improvement.  You should not need to
reduce it below 1400, so if it doesn't improve at 1400, then something
else is the problem.

On Mon, 23 Dec 2002, Condon Thomas A KPWA wrote:

>
> Thanks to all for the inputs last week on security of the DSL connection.
>
> I am having some troubles getting the connection to function correctly, now.
> I'm running SuSE 8.0, and had the personal firewall turned on.  That isn't
> necessary with the Actiontec Gateway/Router/Firewall/modem, though, so I've
> turned it off (and removed it from my init.d/rc.* directories so it won't be
> started anymore).  But packets are not being processed correctly somewhere.
> I can see traffic out and back in when I try to visit a web site (as TX/RX
> on the ethernet port when I issue ifconfig).  The gateway seems to be set
> correctly when I check the routes.  I can ping the gateway and get response.
> I can ping one of my ISP's boxes, and get response back.  I can even ping my
> old ISP (by name) and get response back (although it says "packet
> filtered").  However, it times out on any web site I try to access with a
> browser.  The ISP tech support guy went through all the setup stuff with me
> and got it this far.  He says he can see the packets being delivered to my
> machine (I opened it for SSH), but they are being filtered.  He also has
> suggested "upgrading" to the new RH8.x (since he is familiar with that), but
> I think of re-installing as a Windoze solution.
>
> I've searched the SuSE knowledge base and found some related articles on
> setting up firewalls and internal DSL modems, but not on setting up clients
> to access a router/gateway.
>
> Apologies for less than specific information, but the link at home won't let
> me send email to ask this from the machine that has the problem (which was
> also my home email access).
>
> "ifconfig" shows proper IP and mask for the internal net, and increasing
> transmission and reception packets and bytes when a browser attempts to
> contact a URL.
>
> "route" shows proper routing for default gateway (modem's IP, 0.0.0.0
> netmask).
>
> ISP is running PPPoA access.
>
> I'd be very appreciative of any thoughts on areas I should look into for a
> solution.
>
>
> In Harmony's Way, and In A Chord,
>
> Tom  :-})
>
> Thomas A. Condon
> Barbershop Bass Singer
> Registered Linux User #154358
> A Jester Unemployed
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>

-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Lonni J Friedman				netllama at linux-sxs.org
Linux Step-by-step & TyGeMo		     http://netllama.ipfox.com