On 17 Jan 1997, Rob Browning wrote:
>I was trying to set up a debian box as a gateway from a small 4-bit
>subnet to a larger 8-bit (class C?) subnet. I have the kernel
>configured properly (I think), and I have the two network interfaces
>on the gateway and the routes set up.
Let's assume, the 8-bit net is 192.168.1.[0-255]
and your smaller 4-bit net is 192.168.1.[16-31]
Let's also assume that gateway has ip 192.168.1.17
If all machines on the bigger subnet have netmask 255.255.255.0
they try to reach all host on 192.168.1.* directly by asking:
Who is (e.g.) 192.168.1.19 ?
And there 192.168.1.17 should answer: "That's me" and should forward the
packets to the smaller subnets. (This is just a longer wording of saying
that your administrators are right)
man arp tells you that
arp -h 'hardwareadress' 192.168.1.17 netmask 255.255.255.240 pub
should do the trick. 'hardwareadress' is the Ethernet adress of the card
sitting on the 8-bit Class C subnet. It's the 6 Byte number separated by
colons that you get from the output of the ifconfig command.
Hope that helps
Nils
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