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Why Can I not ping 192.168.2.1

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I set up a G4 Mac 10.5.8 with two ethernet connections. Both with Static addressing. I have internet sharing turned on, with en0 being shared with en1
en0 is 172.20.0.75, 255.255.255.0, Router 172.20.0.1
en1 is 192.168.2.1, 255.255.255.0, Router 172.20.0.75
a laptop using 172.20.0.1 255.255.255.0 is tied to port en0
a mini using 192.168.2.75 255.255.255.0 is tied to port en1
so the schematic looks like;
(laptop 172.20.0.1) <--> (172.20.0.75 en0 - G4 - en1 192.168.2.1) <--> (192.168.2.75 mini)
from the laptop I can ping 172.20.0.1, 172.20.0.75
from the G4 I can ping 172.20.0.1, 172.20.0.75, 192.168.2.1, 192.168.2.75
from the mini I can ping 192.168.2.75, 192.168.2.1, 172.20.0.75, 172.20.0.1
but from the laptop I cannot ping 192.168.2.1 or 192.168.2.75
Any suggestions as to why?

Answers

I'm very rusty on this ... but as I recall, ARP is local to a network - so ARP info won't be passed between your two networks. I think it would work if the laptop was told to use the G4's en0 IP address as router, and the mini was told to use the G4's en1 IP address as router. The laptop, asked to ping the mini, says "not on my network" so sends it to its router (G4 en0), which knows how to deliver it. The mini, replying, says "not on my network" so sends it to its router (G4 en1), which knows how to deliver it, so you get ping & reply.
I don't think it matters that both networks are using private address space, as they are connected by a common device, the G4.

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