On Fri, 26 Sep 2003 13:25:43 -0700 (PDT) Brad De Vries <[EMAIL PROTECTED]> 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.)
Sounds like a typical broken DNF issue. Try lowering the MTU on the
Linux box' connection to your ISP and see if that helps:
ifconfig <dev> mtu 296
If not, does your ISP permit multiple systems behind a NAT box? There
are ways to detect nat'd systems, and he _might_ be blocking them (would
be the first time I've heard of this happening though).
Ciao,
David A. Bandel
--
Focus on the dream, not the competition.
Nemesis Racing Team motto
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