Zaurus and NAT

Message

defknol · Post by **defknol** » Tue Aug 12, 2003 10:04 pm

I just got a new Zaurus 5600

and finally got it to connect to my box using the vanilla sources 2.4.21.

To get this working, I consulted:
http://docs.zaurus.com/index.php?id=lc_generic
among others

The one thing that I've not been able to do is to access the internet (#3.3 from the above referenced doc) from the Zaurus. I successfully compiled in the stuff from the previous step and ran the following:

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ifconfig usb0 192.168.129.1 netmask 255.255.255.255 up
route add -host 192.168.129.201 usb0
iptables -t nat -F

When I ran the following, I got this error:

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iptables -t nat -A POSTROUTING -j SNAT -o eth0 --to 192.168.1.140
iptables: Invalid argument

I'm not very experiencedwith iptables, but I assume that the IP at the end is supposed to be that of eth0.

I am behind a router/switch doing NAT connected to a cable modem on the internet. What am I supposed to put for MY_IP after --to?

ifconfig -a reveals:

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dummy0    Link encap:Ethernet  HWaddr 00:00:00:00:00:00  
          BROADCAST NOARP  MTU:1500  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)

eth0      Link encap:Ethernet  HWaddr 00:40:33:E4:5D:68  
          inet addr:192.168.1.140  Bcast:192.168.1.255  Mask:255.255.255.0
          UP BROADCAST NOTRAILERS RUNNING  MTU:1500  Metric:1
          RX packets:177383 errors:0 dropped:0 overruns:0 frame:0
          TX packets:48359 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100 
          RX bytes:89933394 (85.7 Mb)  TX bytes:5246563 (5.0 Mb)
          Interrupt:16 Base address:0xe800 

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:87 errors:0 dropped:0 overruns:0 frame:0
          TX packets:87 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:14040 (13.7 Kb)  TX bytes:14040 (13.7 Kb)

usb0      Link encap:Ethernet  HWaddr 5E:BF:EE:63:2E:84  
          inet addr:192.168.129.1  Bcast:192.168.129.255  Mask:255.255.255.255
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:53 errors:0 dropped:0 overruns:0 frame:0
          TX packets:10 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100 
          RX bytes:6491 (6.3 Kb)  TX bytes:908 (908.0 b)

Any insight would be appreciated. Thanks -

thesnowman · Post by **thesnowman** » Fri Aug 29, 2003 1:38 pm

Your --to argument should be the IP address of eth0 as you have written.

The problem may be with the iptables package. I had this same problem and read a post somewhere that the iptables package must be compiled against the same kernel version that you are running it under. If you have changed kernel's recently this may be causing your problem. Try:

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emerge iptables

and try it again.

sandcrawler · Post by **sandcrawler** » Fri Aug 29, 2003 8:20 pm

I haven't seen any other replies to this but I have to agree with the above response. We had a similar problem just the other day with iptables. Re-emerging iptables fixed it. We also use the zaurus here and have no trouble with iptables. Heres the line from rules-save:

-A POSTROUTING -s 192.168.0.0/255.255.255.0 -o eth0 -j SNAT --to-source xxx.xxx.xxx.xxx

where all the xxx section is your public iinternet ip address

HTH