Hmmm. Now I have read a bit more on CCO, and I have discovered a few
situations where the local pool addresses and the virtual template addresses
are not on the same subnet. For example,
http://www.cisco.com/univercd/cc/td/doc/cisintwk/intsolns/ipsec.htm#xtocid15
77625
here, unnumbered is referencing FastEthernet3/0 which is in a different
subnet compared to the local pool addresses (ISP3Pool).
So, anybody know what is up with that? Does this mean that I can choose
whatever I feel like choosing for addresses in the 'unnumbered' or the local
pool?
""xc"" wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> I am just starting to read up on VPDN (L2TP) tunnels, I have a question
> about addressing.
>
> I have found on CCO that a typical setup for L2TP has the gateway router
> (the LNS) set up with a virtual-template interface that has an unnumbered
> interface (for example ip unnumbered loopback 0 or ip unnumbered ethernet,
> something like that). Then, in order to provide the client with an
address,
> it often uses something like "peer default ip address pool XXXX), where
XXXX
> is some local pool that has been previously defined.
>
> I have further discovered that the unnumbered address of that
> virtual-template (for example, that ip unnumbered loopback 0) is always
> within the same subnet as those in the local pool.
>
> My question is - is this required? Meaning, do those addresses (the
> address of the interface that the unnumbered command is referencing and
the
> addresses within the local pool) have to be in the same subnet. I think
> that it is required, but I want to be sure, and I unfortunately don't have
> my lab in front of me right now to check it out. CCO always seems to do
it
> this way, but they don't explain if it really is required to do things
this
> way.
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