I have a situation where a server using an internal
ISDN card (ippp0) is the default route using an IP
assigned by the upstream ISP. I also have a sub-net
pointing down this ISDN link which I've assigned to
the ethernet interface. The machine is configured as
per the assigned sub-net but any packets leaving the
system appear to the outside world as coming from the
ISP link IP and not from the assigned eth sub-net. The
eth card is set to 111.22.33.1.
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
111.22.33.04 * 255.255.255.255 UH 0 0 2 ppp2
111.22.33.0 * 255.255.255.192 U 0 0 16 eth0
139.130.0.0 * 255.255.0.0 U 0 0 26 ippp0
127.0.0.0 * 255.0.0.0 U 0 0 34 lo
default * 0.0.0.0 U 0 0 618 ippp0
I am having really wierd problems possibly based on this
fact, so if I can solve this issue I suspect other related
problems will dissappear.
I believe I need to do NAT (network address translation)
but I'm having trouble finding out how to do this with
a 2.0.36 kernel. I may not be able to use the 2.2.*
kernels because the ISDN sub-system is not uptodate.
Could someone please advise me where to find info on NAT
in both the current stable kernel and the 2.20-pre series ?
--markc
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