[RndTbl] IP Masquerading for USB ethernet

Bill Reid billreid at shaw.ca
Sun Dec 21 12:53:31 CST 2003


Sorry I missed your comments on setting up the usb point. Since it is 
defined as a point to point you do not need multiple subnets and NAT is 
not necessary.

For point-to-point I usually define the local address to be the same as 
eth0. That is with pppd but I think it would apply here as well.

Apologies for missing the obvious,

Bill Reid wrote:
> dhcp-relay will forward dhcp requests between subnets but you do not 
> have multiple subnets defined.
> I am missing something in how the iPaq is connected. Is it connected by 
> an Ethernet cable to the USB adaptor?
> It would seem to me that you have to have 2 subnets.
> If you defined the netmask as then eth0 and usb0 would 
> be on different subnets.  I am assuming the router would have an address 
> in the range.
> Brian Doob wrote:
>>     I have a Compaq iPaq with Linux installed on it (see
>> http://opie.handhelds.org/), and it is connected to my Gentoo Linux box
>> with USB ethernet.  The Gentoo box is connected to an Ovislink router
>> (with a DHCP server) via regular ethernet.  I want the hanheld to be
>> able to talk to the net via the Gentoo box.  I have not been able to get
>> IP masquerading to work under Gentoo.  I would prefer to have the
>> handheld get its IP address from the router (and have the Gentoo box
>> just forward the packets).  Does anyone know how to get this working? 
>> Here is some info about my situation:
>> # ifconfig eth0
>> eth0      Link encap:Ethernet  HWaddr 00:20:ED:B8:91:55            
>> inet addr:  Bcast: Mask:
>>           RX packets:3340 errors:0 dropped:0 overruns:0 frame:0
>>           TX packets:3557 errors:0 dropped:0 overruns:0 carrier:0
>>           collisions:0 txqueuelen:1000           RX bytes:3330687 (3.1 
>> Mb)  TX bytes:448922 (438.4 Kb)
>>           Interrupt:11
>> # ifconfig usb0
>> usb0      Link encap:Ethernet  HWaddr 4E:DC:69:01:CA:EF            
>> inet addr:  Bcast: Mask:
>>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>>           RX packets:25 errors:0 dropped:0 overruns:0 frame:0
>>           TX packets:7 errors:0 dropped:0 overruns:0 carrier:0
>>           collisions:0 txqueuelen:1000           RX bytes:980 (980.0 
>> b)  TX bytes:574 (574.0 b)
>> # iptables -t nat -I POSTROUTING -j MASQUERAQDE -s
>> iptables v1.2.8: Couldn't load target
>> `MASQUERAQDE':/lib/iptables/libipt_MASQUERAQDE.so: cannot open shared
>> object file: No such file or directory
>> # uname -a
>> Linux proton 2.4.23-ck1 #1 Thu Dec 4 19:21:52 CST 2003 i686 AMD
>> Athlon(tm) XP 1800+ AuthenticAMD GNU/Linux
>> This is how I bring up the network to the PDA:
>> modprobe uhci
>> sleep 1
>> insmod usbnet
>> ifconfig usb0 netmask pointopoint
>> up
>> route add -host usb0
>> If anyone is interested in the really gritty details, I have attached
>> the config file for my kernel.
>> Does anyone know what I need to do?  Thanks.
>>             -Brian
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