Internet Connection Sharing debian > Windows xp

[szarki432]

Hello

I installed modem Sagem fast 800 on debian .. and i want share internet connection with windows xp
Before this (masquerade) everything worked fine on debian (internet worked)

I say step by step what i done ..

on windows xp i set NIC like this:

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IP Address: 192.168.0.2
Netmask: 255.255.255.0
Gateway: 192.168.0.1
DNS1: 192.168.0.1
DNS2: 212.160.68.2

Debian NIC:

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IP Address: 192.168.0.1
Netmask: 255.255.255.0
Gateway: 192.168.0.1

Next i run those commands:

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ifconfig eth0 192.168.0.1
iptables -t nat -A POSTROUTING -o ppp0 -j MASQUERADE
echo 1 > /proc/sys/net/ipv4/ip_forward
apt-get install dnsmasq ipmasq
/etc/init.d/dnsmasq restart
dpkg-reconfigure ipmasq

I uncomment this line in /etc/sysctl.conf :

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net.ipv4.ip_forward=1

I figured out that i will have to run those commands after every reboot (to have masquerade) :

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ifconfig eth0 192.168.0.1
iptables -t nat -A POSTROUTING -o ppp0 -j MASQUERADE
echo 1 > /proc/sys/net/ipv4/ip_forward

So i decide create /etc/init.d/firewall

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echo 1 > /proc/sys/net/ipv4/ip_forward
iptables -t nat -A POSTROUTING -o ppp0 -j MASQUERADE

of course

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chmod +x /etc/init.d/firewall
update-rc.d firewall defaults 20

And to /etc/network/interfaces i added:

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auto eth0
iface eth0 inet static
address 192.168.0.1
netmask 255.255.255.0
gateway 192.168.0.1

After that i rebooted PC
My debian .. simply stoped for about couple of minutes on:

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Starting MTA:

After that i logged in as root
and i try ping something .. but nothing was pingged.
It shows up after ping try
"unknow ...."
i checked my internet connections and seems to be fine .. but not working
I try

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pppd call net24

and shows up:

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Plugin pppoatm.so loaded

but this plugin was allready loaded durring system booting.

ifconfig shows:

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eth0      Link encap:Ethernet  HWaddr 00:02:a5:35:83:f5
          inet addr:192.168.0.1  Bcast:192.168.0.255  Mask:255.255.255.0
          inet6 addr: fe80::202:a5ff:fe35:83f5/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:73 errors:0 dropped:0 overruns:0 frame:0
          TX packets:135 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:5586 (5.4 KiB)  TX bytes:5945 (5.8 KiB)

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:65 errors:0 dropped:0 overruns:0 frame:0
          TX packets:65 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:5577 (5.4 KiB)  TX bytes:5577 (5.4 KiB)

ppp0      Link encap:Point-to-Point Protocol
          inet addr:77.255.61.246  P-t-P:195.114.190.150  Mask:255.255.255.255
          UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1492  Metric:1
          RX packets:8 errors:0 dropped:0 overruns:0 frame:0
          TX packets:5 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:3
          RX bytes:240 (240.0 B)  TX bytes:61 (61.0 B)

and, /etc/network/interfaces shows:

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# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static
address 192.168.0.1
netmask 255.255.255.0
gateway 192.168.0.1

Please, help me

[szarki432]

I added new info

[Absent Minded]

Don't you have 2 nics in your computer for this? Also I noticed that you are not setting your gateway to your modem. What was the working configuration in your interfaces file before you changed it?

[szarki432]

little misunderstanding
I have 1 nic in debian and 1 in windows xp

Everything was working (internet connection on debian) after instaling modem:
(Quick what i've done)

I downloaded http://eagle-usb.org/ueagle-atm/non-fre ... 1.1.tar.gz
and run commands

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tar xvzf ueagle-data-1.1.tar.gz
mv ueagle-data-1.1 ueagle-atm
mv ueagle-atm /lib/firmware/
apt-get install ppp

I created /etc/ppp/peers/net24

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lock
defaultroute
noipdefault
noauth
holdoff 4
maxfail 25
persist
asyncmap 0
lcp-echo-interval 2
lcp-echo-failure 7
name myid@provider.com
user myid@provider.com
plugin pppoatm.so
0.35

I created /etc/ppp/pap-secrets

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# Secrets for authentication using PAP
# client        server  secret                  IP addresses
"myid@provider.com" * "mypass" *

And after that my internet connection working

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pppd call net24

But when i've done that what is post in 1st post
internet connection stopped working.

Here is my resolv.conf

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nameserver 213.241.79.37
nameserver 213.241.79.38

and data from route command:

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Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
195.114.190.150 *               255.255.255.255 UH    0      0        0 ppp0
192.168.0.0     *               255.255.255.0   U     0      0        0 eth0
default         192.168.0.1     0.0.0.0         UG    0      0        0 eth0

I don't know why i have double eth0
btw. I suppose that i should put IP address of second nic (192.168.0.2) in Destination.
But i don't know how to do it , and if that will be good .. to do that.

[Absent Minded]

okay, i think I need more info, How is your modem connected? USB? I would have thought hat there should have been an entry in /etc/network/interfaes that showed your modem connection. Anyway, it looks to me like you machine is just going around in a circle as I don't see a gatway to the internet. As for needing to put anything in for WinXP's nic you shouldn't have to do that. The way I understand dnsmask WinXP should be set to get a DHCP address from your Debian box. anyway, I "think" you need an entry in your interfaces file for your modem.

[szarki432]

My modem is Sagem F@st 800 it's using USB port.

i think too that i shoul put something to /etc/network/interfaes
but i don't know exactly what
Like u see my modem using ppp0
and has dynamic ip (changing every time after re-connect)

I almost sure that i set all good in win xp (NIC)

I don't have have dhcp installed on debian .. and it will be problem to install it since i don't have internet connection on debian.

btw.
you mean
apt-get install dhcp
or
apt-get install dhcp3-server

Coz i tried install dhcp3-server before and there was a problem durring loading this thing (exactly durring system bootting)

[smallchange]

Your XP settings are correct. Remove the gateway line from /etc/network/interfaces. That establishes a default route to your internal network when you want the default route to be through your modem. The default route is through the gateway, so if the host is not found on your local network that is where it goes to find it. You should have an entry in /etc/hosts that associates your XP address, 192.168.0.2, with that machine and it will be found because it is on your local subnet. Then, because your ppp command includes "defaultroute" when ppp comes up that defaultroute is added.

Summary:
/etc/network/interfaces looks like this

auto eth0
iface eth0 inet static
address 192.168.0.1
netmask 255.255.255.0

Then run

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ifdown eth0 && ifup eth0

Edit: I changed the ) to the 0 it needed to be above.

Then bring up your ppp interface and it should work. As for the enabling of forwarding leave this

net.ipv4.ip_forward=1

in /etc/sysctl.conf and all the echoing business is not needed.

[szarki432]

You meant

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net.ipv4.ip_forward=1

or

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#net.ipv4.ip_forward=1

because i have allready uncomment this line (so it's "on")

[smallchange]

I mean leave net.ipv4.ip_forward=1 uncommented.

[szarki432]

It's working now
masquerade and net connection on debian working perfectly
many thanks

[szarki432]

Hi again

I have another problem with some web pages
They do not work after masqerade (when usb modem is connected to pc with debian)

Those web pages starting to work when i connect my modem directly to pc with windows xp

One person told me that i should put this:

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echo 0 > /proc/sys/net/ipv4/tcp_window_scaling

to /etc/init.d/firewall
But this not helped (I reboot pc with debian to see those changes)

Please help me

[smallchange]

To be of any help we will need to know more about the links that are giving you trouble. Can you point us to one?

[szarki432]

Ok

For example this:
http://debian.linux.pl/

This is polish support for debian

[smallchange]

I don't see any obvious problem. I can't read any of it but it appears to be complete and in place when I look at it. The page is largely javascript. I have not heard any problems with javascript through NAT. Maybe someone else here has some ideas?

What do you see when it has trouble?

[szarki432]

That page (debian.linux.pl)

Is loading, and loading .. so on so on
I waited abou 5 min to Firefox finish loading in page (i not touch FF when he was doing it) and nothing loaded (not a single element)