1. PPP/ARP routing problem: using a PPP remote address inside an Ethernet subnet
Dear Linux users
I have a small LAN with various Linux boxes. At the moment, they use
192.168.*.* addresses according to RFC 1597/1918. Current topology: Ethernet
LAN with 192.168.0.0/255.255.255.240 subnet. One of these Linux box runs as
default gateway with NAT (IP masqeurading), on another one, I set up a PPP
server which allow me to temporarily connect a guest PC (often Windows 98
boxes of friends) without Ethernet NIC to my LAN.
Currently, I assign the address 192.168.0.17 to the guest machine (=remote
IP for Linux's "pppd"). On the gateway Linux box, I added an appropriate
static route, so especially another Windows box inside my LAN is able to
"ping" to this guest box, because it uses the default gateway.
Meanwhile, I'm changing this Intranet into a part the Internet, that means
that I get a *16* address subnet from my ISP as well as a *preconfigurated*
router, so first, I need this *outside* of the regular subnet placed guest
PC IP address change *inside* the Ethernet subnet to save IP addresses (I
have 8 machines => only 11 of 16 addresses used). The challenging problem
for a TCP/IP guru of you is to do an "ipconfig add eth0" command in such a
way that this Linux box, where the PPP guest machine is connected, listens
(=answer the ARP query) to the guest PC's IP address too, but does *not*
process data itself, instead it forwards every packet to the guest PC.
In my company, I have a RAS account, which assigns me 10.11.3.98 as local IP
and 10.11.3.99 as remote IP but in the company's LAN, there's a
10.11.0.0/255.255.0.0 subnet defined, so this RAS offering Windows NT server
listens both to 10.11.3.98 as well as to 10.11.3.99 on the Ethernet NIC so
no static route is necessary for all other equipment in the LAN => a "ping
10.11.3.98" from *any* machine inside the company works correctly.
How can I do the same with Linux? Any solutions and hints are appreciated.
Greetings from Switzerland
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