I'm working a simple, serial-modem / single network (ppp0 eth0) setup.
Which LEAF variant? It's impossible even to begin giving any sort of detailed advice without knowing if it's Dachstein, Bering, or what.
At boot, one of the last messages before login is:
Masquerade: Error: Unable to determine the routes through eth0
Since you have a ppp setup, eth0 is presumably your LAN interface. Without context, this message is hard to interpret, but it make me suspect that you missed some setting and the system thinks that eth0 is the external interface. This is only a guess, though.
I've checked the zones defined, the interfaces defined, and the masquerade definitions, and all appear to agree with the PPP setup instructions in the LEAF User documentation.
I'm sorry to be this blunt, but this sort of a summing up is worthless in a troubleshooting context. Since you are having a problem, it goes without saying that if you made a mistake, you haven't been able to spot it. So that the values you entered "appear [to you] to agree with the PPP setup instructions" is not helpful to diagnosis. The way you describe it, I cannot even figure out what files you examined.
I've tried pinging the IP and the hostname; without a DNS, it's hard to get this to work.
Lack of DNS should have no effect on pinging by IP *address*. What host does "the hostname" refer to?
As to "the IP" ... what IP address are you pinging and what happens when you ping it? (If you don't understand ping responses and how to report and interpret them, there is a ping FAQ on the LEAF Website you can consult.)
I've checked the archives, and googled, but find nothing that sheds light on this.
Did you look at the FAQs?
(Mike - does Google list our FAQs? Apparently imperfectly - "Leaf Linux ping" turns up about 20 matches at or related to the LEAF site, including the SR FAQ but NOT the ping FAQ. Hmmm....)
Could someone point me at something to check, or tests to run, to determine the problem?
Round up the usual suspects. That is, refer to the SQ FAQ listed below, then do what it says. That's why it is there; to get individualized help, first you have to do the basics. That may be enough for you to spot the problem yourself. If not, it will have us a chance to figure out where you went wrong.
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