ADSL Routing Problem

Hello together

I've a speciality problem. I cant find anywhere a answer for this
problem.

I've got an linux route with suse8.2. behind the route there are
several windows an linux machines.

At the first i've a problem with all email-clients on several machines.
i can recieve all mail on all machines, but only send emails without
attachment. I've tried it with outlook, OExpress, Fireball.

Now someone in google has said, the of the ADSL-Device MTU must be
1492. I tried ist, but no effect.

Somone else said, make traceroute to everywhere. The answer of
"traceroute www.web.de" is:
send failed: Operation not permitted

The Answer of "ping www.web.de -l 1400 -f "
--- www.web.de ping statistics ---
28039 packets transmitted, 1679 received, 94% packet loss, time 5157ms

rtt min/avg/max/mdev = 46.751/132.086/164.156/15.768 ms, pipe 1404,
ipg/ewma
0.183/134.216 ms

On 7 Feb 2006 07:11:26 -0800, timnrw <(E-Mail Removed)> wrote:
> Hello together
>
> I've a speciality problem. I cant find anywhere a answer for this
> problem.
>
> I've got an linux route with suse8.2. behind the route there are
> several windows an linux machines.
>
> At the first i've a problem with all email-clients on several machines.
> i can recieve all mail on all machines, but only send emails without
> attachment. I've tried it with outlook, OExpress, Fireball.

I have been using 8.2 Pro for ADSL for years on an old Celeron 300 as
Linux router (kernel pppoe configured with YaST2 for external DSL modem
and /etc/sysconfig/SuSEfirewall2 edited to configure iptables masquerade).

> Now someone in google has said, the of the ADSL-Device MTU must be
> 1492. I tried ist, but no effect.

You actually cannot set ppp0 mtu any higher than 1492. But it might help
to set Linux router LAN mtu to 1942 in case something passing through is
getting fragmented. Although, I only had that problem trying to "receive"
smtp with attachments on sendmail server behind a hardware broadband
router (no problem sending mail through hardware or Linux router)

> Somone else said, make traceroute to everywhere. The answer of
> "traceroute www.web.de" is:
> send failed: Operation not permitted
>
> The Answer of "ping www.web.de -l 1400 -f "
> --- www.web.de ping statistics ---
> 28039 packets transmitted, 1679 received, 94% packet loss, time 5157ms
>
> rtt min/avg/max/mdev = 46.751/132.086/164.156/15.768 ms, pipe 1404,
> ipg/ewma
> 0.183/134.216 ms

Sounds like possibly a bad nic (what network cards and Linux modules for
them?). I had trouble with flickering LED's and packet loss with Dlink
DFE530TX+ nics using 8139too module, unless I force them back to 10baseT
(using: mii-tool -A 10baseT-FD,10baseT-HD eth0) or whichever device. By
default SuSE tried to use rtl8139 module which would not work at all.

So maybe your packet loss and other problems are due to a network card not
working properly at 100baseT.

Sorry
I was ill and couldn't answer in the past.
Now i'm "over the mountain"

> You actually cannot set ppp0 mtu any higher than 1492. But it might help
> to set Linux router LAN mtu to 1942 in case something passing through is
> getting fragmented. Although, I only had that problem trying to "receive"
> smtp with attachments on sendmail server behind a hardware broadband
> router (no problem sending mail through hardware or Linux router)
I think that the LAN mtu have to be 1492 not 1942. I tried both. With
1942 i get the message "SIOCSIFMTU: Invalid argument". With 1492 i've
the same effect with the SMTP-Transfer.

> Sounds like possibly a bad nic (what network cards and Linux modules for
> them?). I had trouble with flickering LED's and packet loss with Dlink
> DFE530TX+ nics using 8139too module, unless I force them back to 10baseT
> (using: mii-tool -A 10baseT-FD,10baseT-HD eth0) or whichever device. By
> default SuSE tried to use rtl8139 module which would not work at all.
As Network-Card I use a 3com (3Com Etherlink II) as eth2
Now the command "mii-tool -A 10baseT-FD,10baseT-HD eth0" don't work on
these Device. The Message is "SIOCGMIIPHY on 'eth2' failed: Operation
not supported".
The command "mii-tool" without anny parameter has the same effect.