** Bill Mullen (Samstag, 21. Juni 2003 06:25)
> I'd recommend putting them on the same subnet, using "Proxy ARP with
> Subnetting". See the HOWTO at:
>
> http://www.linux.org/docs/ldp/howto/mini/Proxy-ARP-Subnet/index.html
>
> To do this, you need to adjust the netmask of the usb0 interface, so
> that the range it covers is a *subset* of the range that eth0 uses,
> like so:
>
> Int. Network Netmask Broadcast
>
> eth0 192.168.0.0 255.255.255.0 192.168.0.255
> usb0 192.168.0.128 255.255.255.128 192.168.0.255
Done.
> The IP of usb0 should be 192.168.0.129, and the PDA's can be anything
> from 192.168.0.130 to 192.168.0.254.
PDA is now 192.168.0.200
>
> In /etc/sysctl.conf, you'll probably need:
>
> net.ipv4.ip_forward = 1
> net.ipv4.conf.default.rp_filter = 0
> net.ipv4.conf.all.proxy_arp = 1
Done.
> And in /etc/sysconfig/network:
>
> FORWARD_IPV4=true
Done.
# /sbin/arp
Address HWtype HWaddress Flags Mask Iface
192.168.0.1 ether xx:xx:xx:xx:xx:xx C eth0
192.168.0.200 ether xx:xx:xx:xx:xx:xx C usb0
(HWaddresses anonymised)
route on desktop:
-----------------
Destination Router Genmask Flags Metric Ref Use Iface
192.168.0.128 * 255.255.255.128 U 0 0 0 usb0
192.168.0.0 * 255.255.255.0 U 0 0 0 eth0
127.0.0.0 * 255.0.0.0 U 0 0 0 lo
default 192.168.0.1 0.0.0.0 UG 0 0 0 eth0
route on PDA:
---------------
Destination Router Genmask Flags Metric Ref Use Iface
192.168.0.0 * 255.255.255.0 U 0 0 0 usbf
127.0.0.0 * 255.0.0.0 U 0 0 0 lo
default 192.168.0.129 0.0.0.0 UG 0 0 0 usbf
Hmm, I am as far as before.
PDA -> usb0 OK
PDA -> eth0 OK
PDA -> router FAILED ("Destination host unreachable")
Using tcpdump on usb0 and eth0 I realized that when PDA pings eth0 only
usb0 is receiving and answering. eth0 remains silent.
There anything I'm missing?
wobo
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