Networking issues

[Net Llama!]

Some kind of crazy arp poisoning maybe?

On Fri, 26 Sep 2003, Brad De Vries wrote:

> I have a network of WinXX PC's with a single Linux box
> acting as the gateway/firewall/dhcp server/e-mail
> server/etc.  My Linux box connects to the ISP via 128K
> ISDN dial-up line (too far away for DSL and cable is
> N/A).
>
> When I first connect the Linux box to the ISP, I can:
> 1) Use the Linux box to traceroute to everything (the
> ISP blocked ICMP so I can't ping outside their
> network).
> 2) Use the Linux box to browse the web (using Lynx).
> 3) Use the WinXX PC's to browse the web to "some"
> sites (google, domains hosted by ISP, etc.)
>
> When I first connect the Linux box to the ISP, I can
> not:
> 1) Use the WinXX PC's to tracert beyond the first two
> hops, Linux box is first and the ISP's router is the
> second.
> 2) Use the WinXX PC's to browse the web to anything
> "big" such as Yahoo!, ABCNews, FoxNews,
> WeatherChannel, etc.
>
> After a while (sometimes 5 minutes, sometimes 20 or
> more) I begin to lose some functionality.  Such as
> traceroute from Linux to the world or pinging the
> ISP's router, etc.  The ISDN Terminal Adapter (i.e.,
> modem) sends the requests, the SD light goes on, but
> never receives a reply, no RD light.
>
> I've been experiencing this problem for the last week
> to 10 days.  Does anyone have any thoughts as to what
> might be the cause?  I've replaced some hardware
> including the hub and cabling and I've tried using an
> analog modem but the same problem persists.  The Linux
> box has been running for a very long time without any
> changes.  (For those of you heavily in the Windows
> world, a user rebooted the Linux box the other day to
> see if it would fix the problem but it, obviously,
> didn't.)
>
> TIA,
> Brad.
>
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-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Lonni J Friedman				netllama at linux-sxs.org
Linux Step-by-step & TyGeMo		     http://netllama.ipfox.com