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I'm having difficulty getting my masquerading system to work.
I have gone through the steps suggested in the ip-masq howto
(http://members.home.net/ipmasq/ipmasq-HOWTO-1.77-5.html):
1) I can ping my local (internal network) machine from itself
2) From the masq server itself, I can ping both its local (internal
network) address as well as its real (external) ip address
3) From the local (internal network) machine, I can ping the internal
address of the masq server
4) From the local machine, I can ping the external (real) address of the
masq server
So far so good.
I cannot get step 5 to work. I cannot get the local machine to ping any
external machine (other than the masq servers external address).
According to the howto, step 4 proves that "masquerading is working (ICMP
Masquerading specifically)."
Step 5 says: "If it didn't work, again check your Internet connection. If
this still doesn't work, make sure you are using the simple rc.firewall
ruleset and that you have ICMP Masqurading compiled into the Linux kernel."
I don't understand these instructions. If the internet connection wasn't
working, how does all the pinging work? And how could the masq server be
accessing (pinging and telneting) external machines? If the simple
rc.firewall ruleset wasn't used, how could the internal machine ping the
masq server's external address? The same question goes for whether ICMP
masquerading is compiled into the Linux kernel: how could I ping anything
in the local network (e.g., step 4)? I thought that step 4 proved that I
had masquerading working?
Any ideas? What have I overlooked?? I am very confused about what to do next.
-Tom
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