internet
|
|
gateway 1
|
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subnet a gateway 2 subnet b
| | | |
*-------------* *----------*
subnet a is 192.168.1.0
subnet b is 192.168.2.0
gateway 2 has two NICs, 192.168.1.101 and 192.168.2.254
Using ipchains I've setup gateway 2 such that subnets a and b can see one
another and both subnets can access the internet.
Eventually subnet b will be moved to a remote site and one of the NICs will
be replaced with a modem.
In the meantime systems on the two subnets are connected to the same hubs
and string and such and it's no big deal to create routes b/w them without
using the gateway.
Anyhoo I figured while experimenting with this stuff I could get away with
one NIC in gateway 2 and use IP aliasing to give it an IP address on each
subnet so that I could work out how to drive all this new fangled fancy
ipchains stuff.
Well, it doesn't work. Seems you need two hardware interfaces to get
forwarding / masquerading to work.
Now why is that ?
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