Very Computer

by **Sven Eisenhard** » Tue, 06 Mar 2001 02:53:00

Hi,
I have two computers. The first is a SUSE 7.0 - Sysem with 2 ethernet-cards.
The other System is Win98.
I am using the Linux-System which has a DSL-connection as a Router. My
problem is:

From the Client (the win98-system) I can surf the most Pages in the www.
Just a few (www.gmx.de for example) do not work - i.e. these pages cannot be
displayed/found. When I surf directly from the router itself everything
works fine.
Has anyone an idea, why my router doesn't work for special IPs ???

Thank you very much

Sven

~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~
email

homepage
[http://infinityCity.de] (last Homepage-Update on 8.1.2001)
~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~

by **John Hanle** » Tue, 06 Mar 2001 05:33:11

Sven, trying browsing the troublesome site using its IP (62.208.255.154 for
www.gmx.de) from your Windows client. If you're able to connect, you most
likely have a DNS related problem.

> Hi,
> I have two computers. The first is a SUSE 7.0 - Sysem with 2
ethernet-cards.
> The other System is Win98.
> I am using the Linux-System which has a DSL-connection as a Router. My
> problem is:

> From the Client (the win98-system) I can surf the most Pages in the www.
> Just a few (www.gmx.de for example) do not work - i.e. these pages cannot
be
> displayed/found. When I surf directly from the router itself everything
> works fine.
> Has anyone an idea, why my router doesn't work for special IPs ???

> Thank you very much

> Sven

> ~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~
> email

> homepage
> [http://infinityCity.de] (last Homepage-Update on 8.1.2001)
> ~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~

by **Sven Eisenhard** » Tue, 06 Mar 2001 08:56:00

I already have tried that but it doesn't work too. The DNS does it's work,
it's a problem with the IPs

> Sven, trying browsing the troublesome site using its IP (62.208.255.154
for
> www.gmx.de) from your Windows client. If you're able to connect, you most
> likely have a DNS related problem.

> > Hi,
> > I have two computers. The first is a SUSE 7.0 - Sysem with 2
> ethernet-cards.
> > The other System is Win98.
> > I am using the Linux-System which has a DSL-connection as a Router. My
> > problem is:

> > From the Client (the win98-system) I can surf the most Pages in the www.
> > Just a few (www.gmx.de for example) do not work - i.e. these pages
cannot
> be
> > displayed/found. When I surf directly from the router itself everything
> > works fine.
> > Has anyone an idea, why my router doesn't work for special IPs ???

> > Thank you very much

> > Sven

by **John Sag** » Tue, 06 Mar 2001 13:04:20

Sven:

> Hi,
> I have two computers. The first is a SUSE 7.0 - Sysem with 2 ethernet-cards.
> The other System is Win98.
> I am using the Linux-System which has a DSL-connection as a Router. My
> problem is:

> From the Client (the win98-system) I can surf the most Pages in the www.
> Just a few (www.gmx.de for example) do not work - i.e. these pages cannot be
> displayed/found. When I surf directly from the router itself everything
> works fine.

Wow, that *is* weird.

Is there any kind of packet filtering going on between the router and
the windows box?

Are you using ipchains/ip masquerading or anything like that?

How do you have your internal IP addresses assigned?

If you were to open up a DOS box on the windows box, can you ping by
domain name or by IP address?

If you open up a console on your router and say "tcpdump -vv -i eth0"
(or whatever your external interface is..) what kind of packets do
you see?

And what do you see if you do the same for your internal interface:
"tcpdump -vv -i eth1"?

- John

--
John Sage
FinchHaven, Vashon Island, WA, USA
http://www.finchhaven.com/

And remember: it's spelled l-i-n-u-x, but it's pronounced "Linux"

> Has anyone an idea, why my router doesn't work for special IPs ???

> Thank you very much

> Sven

> ~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~
> email

> homepage
> [http://infinityCity.de] (last Homepage-Update on 8.1.2001)
> ~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~

by KW » Tue, 06 Mar 2001 15:47:35

SVEN,

I have the same/similar problem. On my linux boxes behind the firewall I
can't get to certain sites. The windows boxes are the same. If I surf
from the linux box connected to the DSL (directly) it works. Some site's
my netscape connection gets refused but IE works on the windows. go
figure. I'm guessing I have something in my "simple" firewall script
that is blocking it...

KW

> Sven:

>> Hi, I have two computers. The first is a SUSE 7.0 - Sysem with 2
>> ethernet-cards. The other System is Win98. I am using the Linux-System
>> which has a DSL-connection as a Router. My problem is:

>> From the Client (the win98-system) I can surf the most Pages in the
>> www. Just a few (www.gmx.de for example) do not work - i.e. these pages
>> cannot be displayed/found. When I surf directly from the router itself
>> everything works fine.

> Wow, that *is* weird.

> Is there any kind of packet filtering going on between the router and
> the windows box?

> Are you using ipchains/ip masquerading or anything like that?

> How do you have your internal IP addresses assigned?

> If you were to open up a DOS box on the windows box, can you ping by
> domain name or by IP address?

> If you open up a console on your router and say "tcpdump -vv -i eth0"
> (or whatever your external interface is..) what kind of packets do
> you see?

> And what do you see if you do the same for your internal interface:
> "tcpdump -vv -i eth1"?

> - John

> --
> John Sage FinchHaven, Vashon Island, WA, USA http://www.finchhaven.com/

> it's pronounced "Linux"

>> Has anyone an idea, why my router doesn't work for special IPs ???

>> Thank you very much

>> Sven

>> ~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~
>> email

>> homepage
>> [http://infinityCity.de] (last Homepage-Update on 8.1.2001)
>> ~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~

by **Clifford Kit** » Wed, 07 Mar 2001 03:54:10

> I have two computers. The first is a SUSE 7.0 - Sysem with
> 2 ethernet-cards. The other System is Win98. I am using the
> Linux-System which has a DSL-connection as a Router. My problem is:
> From the Client (the win98-system) I can surf the most Pages
> in the www. Just a few (www.gmx.de for example) do not work -
> i.e. these pages cannot be displayed/found. When I surf directly
> from the router itself everything works fine.
> Has anyone an idea, why my router doesn't work for special IPs ???

It could be a MTU problem related to PMTU Discovery or masquerading.

Check the MTU of the interface for the DSL connection and for the
interface for the local network with ifconfig on the Linux system.
If the local network MTU is greater than the DSL MTU then try setting
it to the same value as the DSL MTU along with setting the MTU for
the local network interface on the Win98 to that value.

--

/* The generation of random numbers is too important to be left
to chance. */

Very Computer

Linux-Router works fine, just special IPs don't work.

Linux-Router works fine, just special IPs don't work.

Linux-Router works fine, just special IPs don't work.

Linux-Router works fine, just special IPs don't work.

Linux-Router works fine, just special IPs don't work.

Linux-Router works fine, just special IPs don't work.

Linux-Router works fine, just special IPs don't work.