[wlug_org] Route Tables + Question + I Hope I explain this...

[Chris Hodgetts]

Hello, 

I hope I explain this correctly -- 

OK.....

I have a machine, it has a DNS entry for an external IP address that is
different from archnetnz.com, for the purpose of this, we will call it,
lists.archnetnz.com

When you ping lists.archnetnz.com from within the local network it
resolves the external IP address - via the default route, which is what
we want....  archnetnz.com is not the internal network suffix nor is
there an internal DNS server hosting up .archnetnz.com names....

The Ping comes back in via that same default router and it sends it off
to the machine in question through a static route.

This is the routing table of the machine in question - -and it works.

It will connect internally on the network to the external IP address,
and obviously from external to the external IP, for what the static
route exists for forwarding all packets to lists.archnetnz.com's ip
address to it's internal IP address.

ONLY IF THE ROUTE TABLE ON THE MACHINE LOOKS LIKE THIS!

penny:/etc/network# route
Kernel IP routing table
Destination  Gateway       Genmask   lags Metric Ref Use Iface
default    192.168.0.33    0.0.0.0   UG    0      0   0  eth0

But if it looks like this:

penny:/etc/network# route
Kernel IP routing table
Destination  Gateway       Genmask    lags Metric Ref Use Iface
192.168.0.0    *         255.255.255.0 U   0      0   0  eth0
default    192.168.0.33    0.0.0.0   UG    0      0   0  eth0

Which is the standard route when the interface comes up, it does not
route the packets correctly from internal to the external IP address.

Now I hope I have explained it correctly, if you need further
clarification on anything please let me know, and I will be happy to
provide any further info regarding this :)

Thanks...


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