MandrivaUsers.org > MDK 10 - Sharing Internet connection

Full Version: MDK 10 - Sharing Internet connection

MandrivaUsers.org > Advanced Topics > Networking

Singing Banzo

Jul 13 2004, 02:05 PM

Hi people, my first post here, after reading a some answers, close to my problem, but not useful to solve it. I read some mini how-tos also.

I installed Mandrake 10 ("higher" security scheme) and the first thing I need to do is to share my ADSL internet connection. Two nics, both working fine, internet connection up, so I simply went to Mandrakelinux Control Center -> Network & Internet -> Internet connection sharing, answer the couple of questions, and I though I was done, but... nope, I can't even make a ping:

CODE

[root@localhost bin]# ping 192.168.1.2
PING 192.168.1.2 (192.168.1.2) 56(84) bytes of data.
From 192.168.1.1 icmp_seq=1 Destination Host Unreachable
From 192.168.1.1 icmp_seq=1 Destination Host Unreachable
From 192.168.1.1 icmp_seq=1 Destination Host Unreachable
From 192.168.1.1 icmp_seq=1 Destination Host Unreachable
From 192.168.1.1 icmp_seq=1 Destination Host Unreachable
From 192.168.1.1 icmp_seq=1 Destination Host Unreachable
ping: sendmsg: Operation not permitted
From 192.168.1.1 icmp_seq=2 Destination Host Unreachable
ping: sendmsg: Operation not permitted
From 192.168.1.1 icmp_seq=3 Destination Host Unreachable
ping: sendmsg: Operation not permitted
From 192.168.1.1 icmp_seq=4 Destination Host Unreachable
ping: sendmsg: Operation not permitted
From 192.168.1.1 icmp_seq=5 Destination Host Unreachable
ping: sendmsg: Operation not permitted
From 192.168.1.1 icmp_seq=6 Destination Host Unreachable
ping: sendmsg: Operation not permitted

--- 192.168.1.2 ping statistics ---
6 packets transmitted, 0 received, +11 errors, 100% packet loss, time 5064ms

Any idea what could be wrong?

Here the details:
Linux Box:

CODE

[root@localhost bin]# ifconfig
eth0 Link encap:Ethernet HWaddr 00:0A:E6:B0:A1:C8
inet addr:192.168.1.1 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::20a:e6ff:feb0:a1c8/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:12 errors:0 dropped:0 overruns:0 frame:0
TX packets:8 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1560 (1.5 Kb) TX bytes:476 (476.0 b)
Interrupt:11 Base address:0xd000

eth1 Link encap:Ethernet HWaddr 00:08:54:11:B1:E6
inet6 addr: fe80::208:54ff:fe11:b1e6/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:2342 errors:0 dropped:0 overruns:0 frame:0
TX packets:2565 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:833596 (814.0 Kb) TX bytes:289198 (282.4 Kb)
Interrupt:11 Base address:0xdf00

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:523 errors:0 dropped:0 overruns:0 frame:0
TX packets:523 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:43982 (42.9 Kb) TX bytes:43982 (42.9 Kb)

ppp0 Link encap:Point-to-Point Protocol
inet addr:200.55.xxx.xxx P-t-P:200.32.0.14 Mask:255.255.255.255
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1492 Metric:1
RX packets:2185 errors:0 dropped:0 overruns:0 frame:0
TX packets:2403 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:3
RX bytes:776044 (757.8 Kb) TX bytes:226470 (221.1 Kb)

The other machine is a WinXP, connected via hub (hardware works fine):
IP (static): 192.168.1.2
Netmask: 255.255.255.0
Gateway: 192.168.1.1

I also tried with dynamic IP, but it can't find the DHCP server.
When I ping 192.168.1.1 from the WinXP, I get "host unreachable".

As a side note, I tried Coyote Linux with the same parameters, and worked like a charm. :(

Thank you in advance.
SB.

streeter

Jul 13 2004, 02:44 PM

You don't have an IP address set for eth1.

Unfortunately, the Mdk internet connection sharing wizard can be a little unreliable at times...

Have you had a look at the sticky post at the top of the networking forum yet? There is a howto link there that should help.

Chris

Singing Banzo

Jul 13 2004, 03:00 PM

But eth1 is the nic connected to the modem, and I have Internet working fine in the Linux box. (perhaps this is a newbie answer)

I just saw the pinned post

, I will follow the procedure tonigh (now I'm at work), and tell you about any progress.

Thank you for the fast answer.
SB.

streeter

Jul 13 2004, 04:35 PM

I am paying attention this time

You don't have a router and are using ppp(OE?). I don't know much about this set-up - I have never used it.

What you need to do is masquerade eth0 behind your ppp connection - otherwise known as network address translation.

This should work:

Put the following command at the beginning of /etc/sysctl.conf

CODE

net.ipv4.ip_forward=1

Then 'turn off' the redirection to squid that mandrake will have done for you and set up masquerading:
Install iptables - type "urpmi iptables", or use the package manager in the start menu or mcc
Add the following code to the bottom of /etc/rc.d/rc.local:

CODE

iptables -t nat -D PREROUTING -i eth0 -j loc_dnat
iptables -t nat -A PREROUTING -i eth0 -o ppp+ -s 192.168.1.0/24 -d 0/0 -j MASQUERADE

Don't worry if you get an error for the first line.

Reboot and let me know if it works...

Chris

Singing Banzo

Jul 14 2004, 01:53 AM

Well, I still don't understand very well what you make me do (just enough to change eth0 by eth1), but IT WORKS! =)

Thank you very much.

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