Share ppp connection to my LAN?

[hit]

Hello, I have a raspberry with debian wheezy 7.8 on it, exactly this image: http://www.linuxsystems.it/raspbian-whe ... mal-image/

I also have a usb 3g modem connected to it and I'm trying to use it so all my LAN can access internet from there.

The config I already have is


On the raspberry:

ifconfig

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eth0      Link encap:Ethernet  HWaddr b8:27:eb:69:23:a7  
          inet addr:192.168.1.40  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::ba27:ebff:fe69:23a7/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:925 errors:0 dropped:0 overruns:0 frame:0
          TX packets:541 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:69299 (67.6 KiB)  TX bytes:66950 (65.3 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:65536  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

ppp0      Link encap:Point-to-Point Protocol  
          inet addr:95.12.what.ever  P-t-P:10.64.64.64  Mask:255.255.255.255
          UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1500  Metric:1
          RX packets:36 errors:0 dropped:0 overruns:0 frame:0
          TX packets:37 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:3 
          RX bytes:1447 (1.4 KiB)  TX bytes:1626 (1.5 KiB)

ip route show

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default via 10.64.64.64 dev ppp0 
10.64.64.64 dev ppp0  proto kernel  scope link  src 95.12.what.ever 
192.168.1.0/24 dev eth0  proto kernel  scope link  src 192.168.1.40 

cat /proc/sys/net/ipv4/ip_forward

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1

On my desktop computer:

ifconfig

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eth0      Link encap:Ethernet  HWaddr 1c:6f:65:8f:a3:74  
          inet addr:192.168.1.36  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::1e6f:65ff:fe8f:a374/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1440  Metric:1
          RX packets:753954 errors:0 dropped:0 overruns:0 frame:0
          TX packets:469208 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:944809472 (901.0 MiB)  TX bytes:89345056 (85.2 MiB)
          Interrupt:41 Base address:0x6000 

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:296 errors:0 dropped:0 overruns:0 frame:0
          TX packets:296 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:27910 (27.2 KiB)  TX bytes:27910 (27.2 KiB)

(NOTE: There is some data transfered on eth0 but it's using a different default via, when I'm using the raspberry as default via I cant transfer anything)

ip route show

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default via 192.168.1.40 dev eth0 
169.254.0.0/16 dev eth0  scope link  metric 1000 
192.168.1.0/24 dev eth0  proto kernel  scope link  src 192.168.1.36 

I can connect to internet from the raspberry normally but not from my desktop, I've been trying to ping google ip 216.58.210.131 and that doesnt work either

Can someone tell me what am I doing wrong?

Thanks

[steve_v]

You need some iptables masq rules too.

[hit]

You need some iptables masq rules too.

Great! Thanks, that fixed it.